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Effect of Nano-ZrO2on Microstructure and Thermal Shock Behaviour of Al_2O3/SiC Composite Ceramics Used in Solar Thermal Power 认领 引用 被引量：7
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作者 XU Xiaohong JIAO Guohao +3 位作者 WU Jianfeng LENG Guanghui FANG Binzheng ZHAO Fang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第2期285-289,共5页
The Al2O3-ZrO2(3Y)-SiC composite ceramics used in solar thermal power were prepared by micrometric Al2O3,nano-ZrO2 and SiC powders under the condition of pressureless sintering.The bulk density and bending strength of... The Al2O3-ZrO2(3Y)-SiC composite ceramics used in solar thermal power were prepared by micrometric Al2O3,nano-ZrO2 and SiC powders under the condition of pressureless sintering.The bulk density and bending strength of samples with 10vol%nano-ZrO2 sintered at 1480℃were 3.222 g/cm3 and 160.4MPa,respectively.The bending strength of samples after 7 times thermal shock tests(quenching from 1000℃to 25℃in air medium)is 132.0MPa,loss rate of bending strength is only 17%.The effect of nano-ZrO2 content on the microstructure and performance of Al2O3-ZrO2(3Y)-SiC composite ceramic was investigated.The experimental results show that the bending strength of samples with above 10vol%nano-ZrO2 content has decreased,because the volume expansion resulting from t-ZrO2 to m-ZrO2 phase transformation is excessive;Adding proper nano-ZrO2 would be contributed to improve the thermal shock resistance of the composite ceramics.The Al2O3-ZrO2(3Y)-SiC composite ceramic has promising potential application in solar thermal power. 展开更多
关键词 Al2O3 nano-ZrO2 transformation toughening thermal shock resistance composite ceramics solar thermal power
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Thermal shock fatigue behavior of TiC/Al_2O_3 composite ceramics 认领 引用 被引量：6
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作者 SI Tingzhi LIU Ning +1 位作者 ZHANG Qing＇ an YOU Xianqing 《Rare Metals》 SCIE EI CAS 2008年第3期308-314,共7页
The thermal shock fatigue behaviors of pure hot-pressed alumina and 30 wt.% TiC/Al2O3 composites were studied. The effect of TiC and Al2O3 starting particle size on the mechanical properties of the composites was disc... The thermal shock fatigue behaviors of pure hot-pressed alumina and 30 wt.% TiC/Al2O3 composites were studied. The effect of TiC and Al2O3 starting particle size on the mechanical properties of the composites was discussed. Indentation-quench test was conducted to evaluate the effect of thermal fatigue temperature difference （ΔT） and number of thermal cycles （Ⅳ） on fatigue crack growth （Δa）. The mechanical properties and thermal fatigue resistance of TiC/Al203 composites are remarkably improved by the addition of TiC. The thermal shock fatigue of monolithic alumina and TiC/Al2O3 composites is due to a ＂true＂ cycling effect （thermal fatigue）. Crack deflection and bridging are the predominant reasons for the improvement of thermal shock fatigue resistance of the composites. 展开更多
关键词 ceramic matrix composites TiC/Al2O3 composites thermal shock fatigue fatigue behavior fatigue resistance
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Mechanical properties and plasma erosion resistance of BN_p/Al_2O_3-SiO_2 composite ceramics 认领 引用 被引量：5
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作者 段小明 贾德昌 +5 位作者 周玉 杨治华 王玉金 任凤琴 于达仁 丁永杰 《Journal of Central South University》 SCIE EI CAS 2013年第6期1462-1468,共7页
BNp/Al2O3-SiO2 system ceramic matrix composites with different volume fractions （10%-60%） of hexagonal BN particulates （BNp） were prepared by hot-press sintering technique. Phase components, microstructure, mechan... BNp/Al2O3-SiO2 system ceramic matrix composites with different volume fractions （10%-60%） of hexagonal BN particulates （BNp） were prepared by hot-press sintering technique. Phase components, microstructure, mechanical properties and plasma erosion resistance were also investigated. With the increase of h-BNp content, relative density and Vickers＇ hardness of the composite ceramics decrease, while the flexural strength, elastic modulus and fracture toughness increase and then decrease. The plasma erosion resistance linearly deteriorated with the increase of BNp content which is mainly determined by the density, crystal structure and atomic number of the elements. 展开更多
关键词 BNp/Al2O3-SiO2 composite ceramics microstructures mechanical properties plasma erosion resistance
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The Effect of Oxide Particle Addition on the High Temperature Properties and Ablation Resistance of Quartz/Ceramicizable Phenolic Resin Composite Materials 认领 引用
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作者 ZHOU Rui DING Jie +3 位作者 WU Tengfei LU Xiaodie CHEN Jingyu LI Zhiqiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期820-827,共8页
In order to investigate the effects of oxide particles on the high-temperature resistance and ablation performance of ceramicizable phenolic resin composites,three types of quartz fiber-reinforced ceramicizable phenol... In order to investigate the effects of oxide particles on the high-temperature resistance and ablation performance of ceramicizable phenolic resin composites,three types of quartz fiber-reinforced ceramicizable phenolic resin composites were prepared using MgO particles or Al2O3 particles as the second-phase oxides and ZrB2 particles as the high-temperature ceramic filler,through a mold pressing process.The enhancement effects and mechanisms of the added second-phase oxides on the high-temperature resistance and ablation performance of the composites were discussed and analyzed through high-temperature testing,phase characterization,oxyacetylene testing,and microstructure characterization.The results show that ZrB2 particles oxidize to form ZrO2 and B2O3 in an oxygen-rich high-temperature environment.The added second-phase oxide particles can react with B2O3 to form corresponding borates,thereby strengthening the matrix.After treatment at 800℃,the flexural strength of the ZrB2-MgO quartz fiber-reinforced phenolic resin composite(QFPR/ZM)increased by 55.3%compared to the ZrB2 quartz fiber-reinforced phenolic resin composite(QFPR/Z).The oxyacetylene ablation performance of the composites with added oxide particles was significantly influenced by the generated borates.Mg3B2O6 has a higher high-temperature viscosity than Al18B4O33 at high temperatures,resulting in a lower linear ablation rate for QFPR/ZM compared to the ZrB2-Al2O3 quartz fiber-reinforced phenolic resin composite(QFPR/ZA). 展开更多
关键词 MgO Al2O3 phenolic resin ceramicizable composite mechanical properties
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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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Fabrication of Ce-doped(Gd2Y)Al5O12/Y3Al5O12 composite-phase scintillation ceramic 认领 引用 被引量：6
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作者 Shuilin Chen Benxue Jiang +5 位作者 Yang Wang Qiangqiang Zhu Qinghua Yang Wanqiu Ma Ge Zhang Long Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第9期978-983,I0003,共6页
In this paper,a novel Ce(Gd2 Y)Al5O12/Ce:Y3Al5O12(Ce:GYAG/Ce:YAG)composite scintillation ceramic was designed and fabricated by a solid-state reaction method.The phase,luminescence and scintillation properties were in... In this paper,a novel Ce(Gd2 Y)Al5O12/Ce:Y3Al5O12(Ce:GYAG/Ce:YAG)composite scintillation ceramic was designed and fabricated by a solid-state reaction method.The phase,luminescence and scintillation properties were investigated.The Ce:GYAG/Ce:YAG composite ceramic consisting of two-phase has a broad emission band ranging from 500 to 750 nm.The total mass attenuation coefficient of Ce:GYAG/Ce:YAG is 0.3864 cm^-1,in between those of Ce:YAG and Ce:GYAG ceramics.In addition,the composite ceramic had a high light yield of 20430 ph/MeV.By controlling the ratio of GYAG and YAG,the composite ceramic can realize a spectrum design and total mass attenuation coefficient control to meet the requirements for wide-X-ray-energy-range detectors. 展开更多
关键词 Ce:(Gd2Y)Al5O12/Ce:Y3Al5O12 composite ceramic Spectrum control X-ray energy Rare earths
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Preparation of Fe-M Internetallic/TiC-M_2O3Ceramic Composites from Ilmenite by SHS 认领 引用 被引量：1
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作者 ZOU Zhengguang WU Yi +1 位作者 YIN Chuanqiang LI Xiaomin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第4期706-709,共4页
Fe-Al intermetallic/TiC-Al2O3 ceramic composites were successfully prepared by selfpropagating high-temperature synthesis(SHS)from natural ilmenite,aluminium and carbon as the raw materials.The effects of carbon sourc... Fe-Al intermetallic/TiC-Al2O3 ceramic composites were successfully prepared by selfpropagating high-temperature synthesis(SHS)from natural ilmenite,aluminium and carbon as the raw materials.The effects of carbon sources,preheating time and heat treatment temperature on synthesis process and products were investigated in detail,and the reaction process of the FeTiO3-Al-C system was also discussed.It is shown that the temperature and velocity of the combustion wave are higher when graphite is used as the carbon source,which can reflect the effect of the carbon source structure on the combustion synthesis;Prolonging the preheating time or heat treatment temperature is beneficial to the formation of the ordered intermetallics;The temperature and velocity of the combustion wave are improved,but the disordered alloys are difficult to eliminate with the preheating time prolonged.The compound powders mainly containing ordered Fe3Al intermetallic can be prepared through heat treatment at 750℃. 展开更多
关键词 ilmenite Fe-AI intermetallic/TiC-al2O3 ceramic composites SHS I/CMC
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JOINING MECHANISMS OF β"-Al_2O_3 CERAMIC AND PYREX GLASS TO Al MATRIX COMPOSITE 认领 引用 被引量：1
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作者 LIU Cuirong MENG Qingsen +1 位作者 LU Xiaoying HU Lifang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS 2008年第2期42-44,共3页
The bonding of β″-Al2O3 and pyrex glass to A1 matrix composites by anodic bonding process is achieved. The microstructure of the bonded interface and the joining mechanisms are analyzed with scanning electron micros... The bonding of β″-Al2O3 and pyrex glass to A1 matrix composites by anodic bonding process is achieved. The microstructure of the bonded interface and the joining mechanisms are analyzed with scanning electron microscope （SEM）, energy dispersive X-ray fluorescence spectrometer （EDX）. It is observed that the bonding region across the interface consists of the metal layer, oxide transitional layer and the ceramic layer, with the transitional layer composed of surface region and sub-surface region. The bonding process can mainly be categorized into anodic bonding process and solid state diffusing process. The pile-up of the ions and its drift in the interface area are the main reasons for anode oxidation and joining of the interface. The temperature, voltage and the drift ions in the ceramic or glass during the bonding process are the essential conditions to solid state diffusing and oxide bonding at the interface. The voltages, temperature, pressure as well as the surface state are the main factors that influence the anodic bonding. 展开更多
关键词 β″-Al2O3 Pyrex glass Al matrix composite Anodic bonding
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Effect of Interfacial Bonding on the Toughening of Al_2O_3/Ni Ceramic Matrix Composites 认领 引用
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作者 Xudong SUNJ.A. Yeomans 《Journal of Materials Science & Technology》 SCIE EI CAS 1996年第1期29-34,共6页
The main Iimitation to the toughening of the α-Al2O3/Ni composite is the poor bonding atthe interface. which causes the nickel particles to be pulled-out during crack propagation with-out obvious plastic deformation.... The main Iimitation to the toughening of the α-Al2O3/Ni composite is the poor bonding atthe interface. which causes the nickel particles to be pulled-out during crack propagation with-out obvious plastic deformation. A proper control of oxygen content at the Al2O3-Ni interfacecan promote wetting at the intedece, and produce a mechanically interlocked and chemically strengthened intedece, causing most of the nickel particles to be stretched to failure and to expe-rience severe plastic deformation during crack propagation in the composite. Fracture toughnesstesting using a modified double cantilever beam method with in situ observation of crack prop-agation in a scanning electron microscope shows that the composite with the strengthenedinterface has a more desirable R-curve behaviour and a higher fracture toughness value than thenormal composite. 展开更多
关键词 Al Effect of Interfacial Bonding on the Toughening of Al2O3/Ni Ceramic Matrix Composites Ni
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High-entropy(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3:A promising thermal/environmental barrier material for oxide/oxide composites 认领 引用 被引量：24
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作者 Zifan Zhao Heng Chen +6 位作者 Huimin Xiang Fu-Zhi Dai Xiaohui Wang Wei Xu Kuang Sun Zhijian Peng Yanchun Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第12期45-51,共7页
Yttrium aluminum perovskite(YAl O3)is a promising candidate material for environmental barrier coatings(EBCs)to protect Al2 O3 f/Al2 O3 ceramic matrix composites(CMCs)from the corrosion of high-temperature water vapor... Yttrium aluminum perovskite(YAl O3)is a promising candidate material for environmental barrier coatings(EBCs)to protect Al2 O3 f/Al2 O3 ceramic matrix composites(CMCs)from the corrosion of high-temperature water vapor in combustion environments.Nevertheless,the relatively high thermal conductivity is a notable drawback of YAl O3 for environmental barrier coating application.Herein,in order to make REAl O3 more thermal insulating,a novel high-entropy rare-earth aluminate ceramic(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 was designed and synthesized.The as-prepared(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 ceramic possesses close thermal expansion coefficient(9.02×10-6/oC measured from room temperature to 1200℃)to that of Al2 O3.The thermal conductivity of(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3 at room temperature is 4.1 W·m-1K-1,which is almost one third of the value of YAl O3.Furthermore,to effectively prevent the penetration of water vapor from possible pores/cracks of coating layer,which are often observed in T/EBCs,a tri-layer EBC system REAl O3/RE3 Al5 O12/(Al2 O3 f/Al2 O3 CMCs)is designed.Close thermal expansion coefficient to Al2 O3 and low thermal conductivity of(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3,as well as the formation of dense garnet layer at(Y0.2Nd0.2Sm0.2Eu0.2Er0.2)AlO3/Al2 O3 interface,indicate that this new type of high-entropy ceramic is suitable as a candidate environmental barrier coating material for Al2 O3 f/Al2 O3 CMCs. 展开更多
关键词 High-entropy ceramics (Y0.2Nd0.2Sm0.2Eu0.2Er0.2AlO3 Tri-layer EBC system Low thermal conductivity Al2O3f/Al2O3 CMCs
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Influence of Er_2O_3 content on microstructure and mechanical properties of ZTA-TiO_2 composites 认领 引用 被引量：8
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作者 Yudong Sui Li'na Han +1 位作者 Yehua Jiang Quan Shan 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第3期299-304,共6页
The influence of Er_2 O_3 addition on the phase evolution and mechanical properties of sintered(1600 ℃,4 h) ZTA(yttria stabilized zirconia toughened alumina)-TiO_2 composites was investigated. The SEM and XRD results... The influence of Er_2 O_3 addition on the phase evolution and mechanical properties of sintered(1600 ℃,4 h) ZTA(yttria stabilized zirconia toughened alumina)-TiO_2 composites was investigated. The SEM and XRD results reveal the formation of a new erbium zirconium oxide,Zr_3 Er_4 O12,with a granulate morphology when Er_2 O_3 content is higher than 1 wt%. The grain sizes of both Al_2 O_3 and yttria-stabilized zirconia phases decrease with an increase in the Er_2 O_3 content. The relative density, Vickers hardness and fracture toughness of the composites are found to be strongly dependent on their grain sizes, relative densities and the formation of the Zr_3 Er_4 O12 secondary phases. The composite with 5 wt% Er_2 O_3 shows the highest relative density(99.93%), Vickers hardness(1752 HV) and fracture toughness(7.92 MPa·m1/2). 展开更多
关键词 Er2O3 Microstructure Vickers hardness Fracture toughness ZTA-TiO2 ceramic composite Rare earths
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Morphology and Frictional Characteristics Under Electrical Currents of Al_2O_3/Cu Composites Prepared by Internal Oxidation 认领 引用 被引量：10
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作者 刘瑞华 宋克兴 +3 位作者 贾淑果 徐晓峰 郜建新 国秀花 《Chinese Journal of Aeronautics》 SCIE EI CAS 2008年第3期281-288,共8页
Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and coppe... Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and copper against brass are investigated and compared. The changes in morphology of the sliding surface and subsurface are examined with scanning electron microscope （SEM） and energy dispersive X-ray spectrum （EDS）. The results show that the wear resistance of the Al2O3/Cu composites is superior to that of copper under the same conditions, Under a given electrical current, the wear rate of Al2O3/Cu composites decreases as the Al2O3-content increases, However, the wear rates of the Al2O3/Cu composites and copper increase as the sliding speed and pressure increase under dry sliding condition. The main wear mechanisms for Al2O3/Cu composites are of abrasion and adhesion; for copper, it is adhesion, although wear by oxidation and electrical erosion can also be observed as the speed and pressure rise. 展开更多
关键词 Al2O3/Cu composite internal oxidation friction and wear surface morphology current carder
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Effect of MoSi_2 content on dielectric and mechanical properties of MoSi_2/Al_2O_3 composite coatings 认领 引用 被引量：7
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作者 WU Zhi-hong ZHOU Wan-cheng +1 位作者 LUO Fa ZHU Dong-mei 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期111-116,共6页
Molybdenum disilicide （MoSi2） sheath and aluminum oxide （Al2O3） core blended powders were fabricated by spray drying. A derived coating material was produced for the application as microwave absorbers using the as... Molybdenum disilicide （MoSi2） sheath and aluminum oxide （Al2O3） core blended powders were fabricated by spray drying. A derived coating material was produced for the application as microwave absorbers using the as prepared powders by atmospheric plasma spray （APS） technology. The effects of MoSi2/Al2O3 mass ratio on the dielectric and physical mechanical properties of the composite coatings were investigated. When the MoSi2 content of the composites increases from 0 to 45%, the flexure strength and fracture toughness improve from 198 to 324 MPa and 3.05 to 4.82 MPa-m1/2 then decline to 310 MPa and 4.67 MPa-m1/2, respectively. The dielectric loss tangent increases with increasing MoSi2 content, and the real part of permittivity decreases conversely over the frequency range of 8.2-12.4 GHz. These effects are due to the agglomeration of early molten MoSi2 particles and the increase of the electrical conductivity with increasing MoSi2 content. 展开更多
关键词 MoSi2/Al2O3 composite coating atmospheric plasma spraying mechanical properties dielectric properties
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Effect of hot extrusion on microstructure and tribological behavior of Al2O3p reinforced 7075 aluminum-matrix composites 认领 引用 被引量：4
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作者 LEI Yu-shun YAN Hong +4 位作者 WEI Zhi-fan XIONG Jun-jie ZHANG Peng-xiang WAN Jian-ping WANG Zhi-lu 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第8期2269-2284,共16页
The effects of hot extrusion and addition of Al2O3p on both microstructure and tribological behavior of 7075 composites were investigated via optical microscopy(OM),scanning electron microscopy(SEM),energy dispe... The effects of hot extrusion and addition of Al2O3p on both microstructure and tribological behavior of 7075 composites were investigated via optical microscopy(OM),scanning electron microscopy(SEM),energy dispersive spectrometry(EDS),and transmission electron microscopy(TEM).The experimental consequences reveal that the optimal addition of Al2O3p was 2 wt%.After hot extrusion,the Mg(Zn,Cu,Al)2 phases partially dissolve into the matrix and generate many uniformly distributed aging precipitation particles,the Al7Cu2Fe phases are squeezed and broken,and the Al2O3p become uniform distribution.The microhardness of as-extruded 2 wt%Al2O3p/7075 composites reaches HV 170.34,increased by 41.5%than as-cast composites.The wear rate of as-extruded 2 wt%Al2O3p/7075 composites is further lower than that of as-cast composites under the same condition.SEM-EDS analyses reveal that the reinforced wear resistance of composites can put down to the protective effect of the Al2O3p reinforced transition layer.After hot extrusion,the transition layer becomes stable,which determines the reinforced wear resistance of the as-extruded composites. 展开更多
关键词 7075 alloy Al2O3p composites hot extrusion microstructure tribological behavior
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Microstructure and microwave dielectric properties of lead borosilicate glass ceramics with Al_2O_3 认领 引用 被引量：4
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作者 韦鹏飞 周洪庆 +2 位作者 王杰 张一源 曾凤 《Journal of Central South University》 SCIE EI CAS 2011年第6期1838-1843,共6页
The effects of Al2O3 addition on both the sintering behavior and microwave dielectric properties of PbO-B203-SiO2 glass ceramics were investigated by Fourier transform infrared spectroscope （FTIR）, differential ther... The effects of Al2O3 addition on both the sintering behavior and microwave dielectric properties of PbO-B203-SiO2 glass ceramics were investigated by Fourier transform infrared spectroscope （FTIR）, differential thermal analysis （DTA）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results show that with the increase of Al2O3 content the bands assigned to [SiO4] nearly disappear. Aluminum replaces silicon in the glass network, which is helpful for the formation of boron-oxygen rings. The increase of the transition temperature Tg and softening temperature Tf of PbO-B2O3-SiO2 glass ceramics leads to the increase of liquid phase precipitation temperature and promotes the structure stability in the glasses, and consequently contributes to the decreasing trend of crystallization. Densification and dielectric constants increase with the increase of Al2O3 content, but the dielectric loss is worsened. By contrast, the 3% （mass fraction） Al2O3-doped glass ceramics sintered at 725℃ have better properties of density p=2.72 g/cm3, dielectric constant Er=6.78, dielectric loss tan8=2.6×10^-3 （measured at 9.8 GHz）, which suggest that the glass ceramics can be applied in multilayer microwave devices requiring low sintering temperatures. 展开更多
关键词 PbO-B203-SiO2 glass ceramics Al2O3 Fourier transform infrared spectroscope microstructure dielectric properties
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Effects of Yttrium Ion on Formation Mechanism of ZrO_2-Y_2O_3 Ceramic Coatings Formed by Plasma Electrolytic Oxidation on Al-12Si Alloy 认领 引用 被引量：4
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作者 王萍 LI Jianping +2 位作者 GUO Yongchun YANG Zhong WANG Jianli 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第5期1044-1048,共5页
ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that... ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of ZrO2-Y2O3 coating is 16 μn thicker than that of ZrO2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g-L-1The maximum thickness is 90 μm.Compared to ZrO2 coating, the micropores of ZrO2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by ZrO2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-ZrO2, α-Al2O3, ,γ-Al2O3 and Y2O3. It is indicated that ZrO2 has beert fully stabilized by yttrium ion through the formation of solid solution. 展开更多
关键词 Al-12Si alloys yttrium ion plasma electrolytic oxidation ZrO2-Y2O3 ceramic coating
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Laser Cladding Al-Si/Al_2O_3-TiO_2 Composite Coatings on AZ31B Magnesium Alloy 认领 引用 被引量：4
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作者 崔泽琴 YANG Hongwei +2 位作者 王文先 WU Hongliang XU Bingshe 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第6期1042-1047,共6页
To improve the wear resistance and corrosion resistance of magnesium alloys, a 5 kW continuous wave CO2 laser was used to investigate the laser surface cladding on AZ31 B magnesium alloys with Al-Si/Al2O3-TiO2 composi... To improve the wear resistance and corrosion resistance of magnesium alloys, a 5 kW continuous wave CO2 laser was used to investigate the laser surface cladding on AZ31 B magnesium alloys with Al-Si/Al2O3-TiO2 composite powders. A detailed microstructure, chemical composition, and phase analysis of the composite coatings were studied by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, and X-ray diffraction （XRD）. The laser cladding shows good metallurgical bonding with the substrate. The composite coatings are composed of Mgl7Al12, Al3Mg2, Mg2Si, Al2O3, and TiO2 phases. Compared to the average microhardness （50HV0.05） of the AZ3 1 B substrate, that of the composite coatings （230HV0.05） is improved significantly. The wear resistances of the surface layers were evaluated in detail. The results demonstrate that the wear resistances of the laser surface-modified samples are considerably improved compared to the substrate. It also show that the composite coatings exhibit better corrosion resistance than that of the substrate in 3.5wt% NaCI solution. 展开更多
关键词 AZ31B magnesium alloy laser cladding Al-Si/Al2O3-TiO2 composite coating wear resistance corrosion resistance
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Effects of Cerium on the Mechanical Properties of the ZA22/Al_2O_3 Composites 认领 引用 被引量：5
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作者 于思荣 何镇明 +1 位作者 孟长生 陈凯 《Journal of Rare Earths》 SCIE EI CAS 1995年第1期27-31,共5页
ZA22/Al2O3 composites were prepared by means of squeeze casting process. The effects of Ce on the ultimate tensile strength (UTS), impact toughness, and hardness of the composites were studied. The results show that b... ZA22/Al2O3 composites were prepared by means of squeeze casting process. The effects of Ce on the ultimate tensile strength (UTS), impact toughness, and hardness of the composites were studied. The results show that both the UTS and the hardness are improved and the impact toughness is decreased with the increase of the volume fraction of fibers (Vf). After Ce is added ,UTS (Vf>15%) and the hardness are improved at room temperature because of the modification of Ce, but the impact toughness and UTS at elevated temperature are lowered.The filtered action of the fiber preform results in that the influence of the amount of Ce added from 0. 1 wt% to 0. 5 wt% on the mechanical properties of the composites can be ignored. 展开更多
关键词 Cerium Zn-Al alloy Al2O3 Composite materials Mechanical property
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Microstructure and evolution of(TiB_2+Al_2O_3)/NiAl composites prepared by self-propagation high-temperature synthesis 认领 引用 被引量：5
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作者 宋晓杰 崔洪芝 +1 位作者 曹丽丽 P.Y.GULYAEV 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第7期1878-1884,共7页
（TiB2＋Al2O3）/NiAl composites were synthesized by self-propagation high-temperature synthesis, and their phase compositions, microstructures and evolution modes were studied. The microstructures and shapes vary with... （TiB2＋Al2O3）/NiAl composites were synthesized by self-propagation high-temperature synthesis, and their phase compositions, microstructures and evolution modes were studied. The microstructures and shapes vary with the TiB2＋Al2O3 content in the NiAl matrix. TiB2 particles take a great variety of elementary shapes such as white bars, plates, herringbones, regular cubes and cuboids. These results outline a strategy of self-assembly processes in real time to build diversified microstructures. Some TiB2 grains in sizes of 2-5μm are embeded in Al2O3 clusters, while a small number of TiB2 particles disperse in the NiAl matrix. It is believed that the higher the TiB2＋Al2O3 content is, the more the regular shapes and homogeneous distributions of TiB2 and Al2O3 will be present in the NiAl matrix. 展开更多
关键词 （TiB2＋Al2O3）/NiAl composites self-propagation high-temperature synthesis microstructure evolution mechanism
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Microstructure and Mechanical Properties of Al_2O_3/ZrO_2 Directionally Solidified Eutectic Ceramic Prepared by Laser 3D Printing 认领 引用 被引量：21
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作者 Zhi Liu Kan Song +4 位作者 Bo Gao Tian Tian Haiou Yang Xin Lin Weidong Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第4期320-325,共6页
Directionally solidified eutectic ceramics such as Al2O3/ZrO2 are promising structural materials for ap- plications in harsh environment with an ultrahigh temperature. In this work, through adopting assistant heating ... Directionally solidified eutectic ceramics such as Al2O3/ZrO2 are promising structural materials for ap- plications in harsh environment with an ultrahigh temperature. In this work, through adopting assistant heating laser 3D printing, Al2O3/ZrO2 eutectic samples were manufactured with suppressing the forma- tion of cracks. The dependence of the average rod spacing （λav） on the scanning rate （V） follows a relation with λavV0.5 = 1 μm1.5 s^-0.5. Typical eutectic microstructures, so-called complex regular, were analyzed with respect to its evolution with modulating the growth conditions. Formation mechanism of the solidifi- cation defect, shrinkage porosity, was discussed and the defect is found to be significantly suppressed by optimizing the solidification parameters. The maximum hardness and fracture toughness are mea- sured to he 16.7 GPa and 4.5 MPa m1/2, respectively. The interplay between the propagation of cracks and the Al2O3/ZrO2 interface is discussed. 展开更多
关键词 Al2O3 ZrO2 Eutectic Solidification
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