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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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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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Sintering,crystallization and dielectric properties of CaO-B_2O_3-SiO_2 system glass ceramics 认领 引用 被引量：3
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作者 戴斌 朱海奎 +2 位作者 周洪庆 许贵军 岳振星 《Journal of Central South University》 SCIE EI CAS 2012年第8期2101-2106,共6页
CaO-B203-SiO2 （CBS） glass powders are prepared by conventional glass melting method at different melting temperatures whose properties and microstructures are characterized by X-ray diffraction （XRD） and scanning ... CaO-B203-SiO2 （CBS） glass powders are prepared by conventional glass melting method at different melting temperatures whose properties and microstructures are characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It is found that there are SiO2 and some unknown phases in CBS glass melting liquid from 1 300 ℃ to 1 500 ℃ and the amount of these phases decreases with the increase of the melting temperature. The CBS glass melted at 1 450 ℃ could be sintered from 830 ℃ to 930 ℃ and the bulk densities of the samples are all higher than 2.4 g/cm^3. From the points of the properties and energy conservation, the melting temperature of 1 450 ℃ is the optimal melting temperature. The glass ceramic sintered at 850 ℃ exhibits better dielectric properties： er=6.33, tan6=2.2×10^-3 at 10 GHz, and the major phases of the samples are CaSiO3, CaB2O4 and SiO2. 展开更多
关键词 glass ceramics CaO-B2O3-SiO2 sintering dielectric properties microstructure
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THE STRUCTURE AND PROPERTIES OF Li_2O-Al_2O_3-SiO_2LOW EXPANSION GLASS CERAMICS CONTAINING B_2O_3 认领 引用 被引量：8
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作者 XIAO Jing LI Hong CHENG Jinshu Wuhan University of Technology Wuhan University of Metallurgy 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1999年第1期41-45,共5页
Through measuring the coefficient of linear expansion, the structure and properties of the Li2O-Al2O3-SiO2 low expansion glass ceramics containing B2O3 are studied by JR and XRD. It is shoutn that the IR method is eff... Through measuring the coefficient of linear expansion, the structure and properties of the Li2O-Al2O3-SiO2 low expansion glass ceramics containing B2O3 are studied by JR and XRD. It is shoutn that the IR method is efficient in the study of the glass-ceramics structure. There is a " Boron abnormality" in the system which has an important influence on the properties of the glass-ceramics. 展开更多
关键词 boron abnormality Li2O-Al2O3-SiO2 system glass ceramics
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(Y0.25Yb0.25Er0.25Lu0.25)2(Zr0.5Hf0.5)2O7: A defective fluorite structured high entropy ceramic with low thermal conductivity and close thermal expansion coefficient to Al2O3 认领 引用 被引量：25
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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4期167-172,共6页
Al2O3f/Al2O3 ceramic matrix composites(CMC)are promising candidate materials of blades and combustor liners of future gas turbines in light of their higher temperature capability,higher environmental stability and oxi... Al2O3f/Al2O3 ceramic matrix composites(CMC)are promising candidate materials of blades and combustor liners of future gas turbines in light of their higher temperature capability,higher environmental stability and oxidizing-free capacity[1–3].Nevertheless,grain growth,sintering and creep deformation at high operation temperatures are still serious problems for Al2O3f/Al2O3 ceramic matrix composites,which can lead to a reduction in the strength and damage tolerance[2].Moreover,Al2O3 can be corroded by the high temperature water vapor in combustion environments and yields volatile products,such as Al(OH)3[4].Consequently,environmental barrier coatings(EBCs)are necessary for Al2O3f/Al2O3 ceramic matrix composites,which can protect Al2O3f/Al2O3 CMC from high temperature and flowing combustion gas corrosion and thus increase the high temperature capability and the service life of components. 展开更多
关键词 Al2O3f/Al2O3 ceramic matrix conductivity close thermal expansion
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(La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4: A high-entropy rare-earth phosphate monazite ceramic with low thermal conductivity and good compatibility with Al2O3 认领 引用 被引量：28
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作者 Zifan Zhao Heng Chen +4 位作者 Huimin Xiang Fu-Zhi Dai Xiaohui Wang Zhijian Peng Yanchun Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第12期2892-2896,共5页
Low thermal conductivity, matched thermal expansion coefficient and good compatibility are general requirements for the environmentalhermal barrier coatings(EBCs/TBCs) and interphases for Al2O3 f/Al2O3 composites. In ... Low thermal conductivity, matched thermal expansion coefficient and good compatibility are general requirements for the environmentalhermal barrier coatings(EBCs/TBCs) and interphases for Al2O3 f/Al2O3 composites. In this work, a novel high-entropy(HE) rare-earth phosphate monazite ceramic (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is designed and successfully synthesized. This new type of HE rare-earth phosphate monazite exhibits good chemical compatibility with Al2O3, without reaction with Al2O3 as high as 1600℃ in air. Moreover, the thermal expansion coefficient(TEC) of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4(8.9 × 10^-6/℃ at 300–1000℃) is close to that of Al2O3. The thermal conductivity of HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 at room temperature is as low as 2.08 W·m^-1·K^-1, which is about 42% lower than that of La PO4. Good chemical compatibility, close TEC to that of Al2O3, and low thermal conductivity indicate that HE (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 is suitable as a candidate EBC/TBC material and an interphase for Al2O3 f/Al2O3 composites. 展开更多
关键词 (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4 High-entropy ceramics Al2O3f/Al2O3ceramic matrix composites Environmental barrier coating materials Interphase material Thermal expansion coefficient Thermal conductivity Solution synthesis Rare-earth phosphates Monazite
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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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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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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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Interface characteristics of Al_2O_3-13%TiO_2 ceramic coatings prepared by laser cladding 认领 引用 被引量：5
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作者 高雪松 田宗军 +1 位作者 刘志东 沈理达 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2498-2503,共6页
Al2O3-13%TiO2 （mass fraction） coatings, prepared by laser cladding on nickel-based alloy, were heated using high frequency induction sources. The coating microstructure and the interface between bond coating and cer... Al2O3-13%TiO2 （mass fraction） coatings, prepared by laser cladding on nickel-based alloy, were heated using high frequency induction sources. The coating microstructure and the interface between bond coating and ceramic coating were characterized by SEM, XRD and EDS. The results show that two-layer substructure exists in the ceramic coating： one layer evolving from fully melted region where the sintered grains grow fully; another layer resembling the liquid-phase-sintered structure consisting of three-dimensional net where the melted Al2O3 particles are embedded in the TiO2-rich matrix. The mechanism of the two-layer substructure formation is also explained in terms of the melting and flattening behavior of the powders during laser cladding processing. The spinel compounds NiAl2O4 and acicular compounds Cr2O3 are discovered in the interface between bond coating and ceramic coating. It proves that the chemical reactions in the laser cladding process will significantly enhance the coating adhesion. 展开更多
关键词 ceramic coating nickel alloy laser cladding Al2O3-TiO2 high frequency induction
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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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Guiding of 150 keV O6+ ions through nanocapillaries in an uncoated Al_2O_3 membrane:special time dependence of the transmission profile width 认领 引用 被引量：1
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作者 陈熙萌 席发元 +14 位作者 邱玺玉 邵剑雄 肖国青 崔莹 孙光智 王俊 陈益峰 刘会平 尹永智 王瑜玉 李德慧 娄凤君 王兴安 徐俊奎 周春林 《Chinese Physics B》 SCIE EI CAS 2009年第5期1955-1960,共6页
This paper reports that the transmission of O6＋ ions with energy of 150keV through capillaries in an uncoated Al2O3 membrane was measured, and agreements with previously reported results in general angular distributi... This paper reports that the transmission of O6＋ ions with energy of 150keV through capillaries in an uncoated Al2O3 membrane was measured, and agreements with previously reported results in general angular distribution of the transmitted ions and the transmission fractions as a function of the tilt angle well fitted to Gaussian-like functions were observed. Due tousing an uncoated capillary membrane, our φc is larger than that using a gold-coated one with a smaller value of Ep/q, which suggests a larger equilibrium charge Q∞ in our experiment. The observed special width variation with time and a larger width than that using a smaller Ep/q were qualitatively explained by using mean-field classical transport theory based on a classical-trajectory Monte Carlo simulation. 展开更多
关键词 guiding effect Al2O3 nanocapillaries uncoated membrane transmission profile width
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Preliminary Study on Combining K2O-Al2O3-SiO2 System Dental Glass Ceramic with Al2O3 Ceramic 认领 引用
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作者 吴琪琪 XU Yujing +1 位作者 JIN Fengchao 张飚 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第2期491-493,共3页
Relationship between K2O-Al2O3-SiO2 system dental glass ceramics and Al2O3 ceramics was investigated. 4 groups of glass ceramic with the same components but different thickness（0.8, 1.2, 1.6, and 2.0 mm） were sinter... Relationship between K2O-Al2O3-SiO2 system dental glass ceramics and Al2O3 ceramics was investigated. 4 groups of glass ceramic with the same components but different thickness（0.8, 1.2, 1.6, and 2.0 mm） were sintered on Al2O3 base ceramics according to the same thermal treatment system of leucite micro-crystallization reported in previous literatures. The products of each group were analyzed by polarizing microscope, X-ray diffractometer, and an INSTRON material testing machine. Under the thermal treatment system, leucite crystals were formed in samples of each group, and dispersed evenly. Meanwhile, the compressive strengths of group 3 and group 4 were higher than those of group 1 and group 2. Samples of group 3 showed better mechanical properties than others. The conclusions are drawn that Leucite crystals can be controlled in K2O-Al2O3-SiO2 system glass ceramic-Al2O3 ceramic composite material, and the thickness of glass ceramic has a notable influence on the compressive strength of this ceramic composite material. 展开更多
关键词 glass ceramics Al2O3 ceramics composite ceramic material compressive strength
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Studies on the Structure and Properties of Multiphase Al_2O_3 Abrasion-resistant Ceramics 认领 引用 被引量：3
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作者 WU Ren-Ping YU Yan RUAN Yu-Zhong 《Chinese Journal of Structural Chemistry》 SCIE CAS 北大核心 2006年第7期805-810,共6页
The Al2O3 abrasion-resistant ceramics is successfully prepared by using waste aluminum sludge as the main raw material with the addition of a little clay, talc and barium carbonate. The crystal structure and microstru... The Al2O3 abrasion-resistant ceramics is successfully prepared by using waste aluminum sludge as the main raw material with the addition of a little clay, talc and barium carbonate. The crystal structure and microstructure of ceramic are characterized by means of XRD, SEM, etc., and the physical and mechanical properties are also tested. The results show that besides the phase of corundum, a little mullite, Mg-Al spinel and hyalophane phases also exist in the product. These phases are produced via reaction in-situ, which can inhibit the overgrowth of Al2O3 grain in grain boundary, and improve the integral property of the material. 展开更多
关键词 Al2O3 ceramic crystal structure property in-situ synthesis
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Comparison between AlN and Al2O3 ceramics applied to barrier dielectric of plasma actuator 认领 引用
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作者 卞栋梁 吴云 +2 位作者 贾敏 龙昌柏 焦胜博 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第8期242-249,共8页
This paper reports the material characterization and performance evaluation of an AlN ceramic based dielectric barrier discharge（DBD） plasma actuator. A conventional Al2O3 ceramic is also investigated as a control. ... This paper reports the material characterization and performance evaluation of an AlN ceramic based dielectric barrier discharge（DBD） plasma actuator. A conventional Al2O3 ceramic is also investigated as a control. The plasma images,thermal characteristics and electrical properties of the two actuators are compared and studied. Then, with the same electrical operating parameters（12-kV applied voltage and 11-kHz power frequency）, variations of the surface morphologies,consumed power and induced velocities are recorded and analyzed. The experimental results show that the AlN actuator can produce a more uniform discharge while the discharge of the Al2O3 actuator is easier to become filamentary. The later condition leads to higher power consumption and earlier failure due to electrode oxidation. In the plasma process,the power increment of the AlN actuator is higher than that of the Al_2O_3 actuator. The induced velocity is also influenced by this process. Prior to aging, the maximum induced velocity of the AlN actuator is 4.2 m/s, which is about 40% higher than that of the Al2O3 actuator. After 120-min plasma aging, the maximum velocity of the aged AlN actuator decreases by 27.8% while the Al_2O_3 actuator registers a decrease of 25%. 展开更多
关键词 plasma DBD flow control discharge ionic wind Al2O3 ceramic AIN ceramic
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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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Microstructure evolution and crystallography of directionally solidified Al2O3/Y3Al5O12 eutectic ceramics prepared by the modified Bridgman method 认领 引用 被引量：3
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作者 Xu Wang Nan Zhang +4 位作者 Yujie Zhong BailingJiang Langhong Lou Jian Zhang Jingyang Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第9期1982-1988,共7页
Large size,high-density(99.97%)and well-organized Al2O3/Y3Al5O12(YAG)eutectic ceramics were prepared by the modified Bridgman method.The evolution of the three dimensional microstructure and micropores were investigat... Large size,high-density(99.97%)and well-organized Al2O3/Y3Al5O12(YAG)eutectic ceramics were prepared by the modified Bridgman method.The evolution of the three dimensional microstructure and micropores were investigated.The diameter of the micro-pores and the porosity decreased during directional solidification.The average equivalent diam eter of the micro-pores was 2.41μm in the well-prepared eutectic ceramics.Most of the pores(98.07%)were smaller than 4μm.These data are comparable to those prepared by the optical floating zone method.The as-grown eutectic ceramics were polycrystalline,but the interfaces were well-bonded and there were no amorphous phases in the microstructure.The misfits of the different crystallographic relationships were calculated,and the bottleneck of the single-crystal preparation was identified.These results could provide theoretical guidance for the preparation of large,single-crystal Al2O3/YAG eutectic ceramics by the modified Bridgman method. 展开更多
关键词 Al2O3/YAG eutectic ceramics Crystallography Interfaces Bridgman method
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A novel technique for making open-cell Al_2O_3-ZrO_2 ceramic foam with plant seed template 认领 引用 被引量：2
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作者 Yu Jingyuan Li Qiang +2 位作者 Tang Ji Sun Xudong Li Xiaodong 《China Foundry》 SCIE CAS 2010年第3期224-229,共6页
The aim of the present research is to provide a technique for preparing open-cell Al2O3-ZrO2 ceramic foams with uniform cell size.This technique used plant seeds to array templates and centrifugal slip casting to obta... The aim of the present research is to provide a technique for preparing open-cell Al2O3-ZrO2 ceramic foams with uniform cell size.This technique used plant seeds to array templates and centrifugal slip casting to obtain cell struts with high packing density.Aqueous Al2O3-ZrO2 slurries with up to 50 vol.% solid contents were prepared and the rheological characteristic of the slurries was investigated.Consolidation was performed at an acceleration of 2,860 g for 60 min.The effect of the characteristic of plant seeds on the drying behavior of Al2O3-ZrO2 green compact was analyzed.The effects of the solid contents of slurries on segregation phenomena of Al2O3 and ZrO2 particles and green compact uniformity were investigated.The compressive stress-strain curve and deformation behavior of Al2O3-ZrO2 ceramic foams prepared using plant seed template were analyzed.The results showed segregation phenomenon is negligible for highly stable slurry with 50 vol.% solid loading.The prepared cell struts of Al2O3-ZrO2 foams have high green density (61.9% TD), sintered density (99.1% TD) and homogeneous microstructure.When sintered at 1,550 ℃ for 2 h, the cell size of Al2O3-ZrO2 foam is approximately uniform and the diameter is about 1.1 mm.The porosity and compressive strength of sintered products is 66.2% and 5.86 MPa, respectively. 展开更多
关键词 Al2O3-ZrO2 ceramic foam plant seed template centrifugal slip casting segregation
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Predicting model on ultimate compressive strength of Al_2O_3-ZrO_2 ceramic foam filter based on BP neural network 认领 引用 被引量：2
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作者 Yu Jingyuan Li Qiang +1 位作者 Tang Ji Sun Xudong 《China Foundry》 SCIE CAS 2011年第3期286-289,共4页
In present study, BP neural network model was proposed for the prediction of ultimate compressive strength of Al2O3-ZrO2 ceramic foam filter prepared by centrifugal slip casting. The inputs of the BP neural network mo... In present study, BP neural network model was proposed for the prediction of ultimate compressive strength of Al2O3-ZrO2 ceramic foam filter prepared by centrifugal slip casting. The inputs of the BP neural network model were the applied load on the epispastic polystyrene template （F）, centrifugal acceleration （v） and sintering temperature （T）, while the only output was the ultimate compressive strength （（7）. According to the registered BP model, the effects of F, v, T on 0 were analyzed. The predicted results agree with the actual data within reasonable experimental error, indicating that the BP model is practically a very useful tool in property prediction and process parameter design of the Al2O3-ZrO2 ceramic foam filter prepared by centrifugal slip casting. 展开更多
关键词 Al2O3-ZrO2 ceramic foam centrifugal slip casting BP neural network process parameters ultimate compressive strength
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Morphological characterization of Al_2O_3 membrane fabricated by sol-gel dip-coating method 认领 引用 被引量：1
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作者 徐占锋 张良苗 +3 位作者 陈念贻 陆文聪 张振 吴祖燊 《Journal of Shanghai University(English Edition)》 2006年第6期553-557,共5页
Alumina membranes without pinholes and cracks were prepared by the sol-gel process using anunordum aluminium sulphate as the starting material. The effects of different preparing conditions on morphology characteristi... Alumina membranes without pinholes and cracks were prepared by the sol-gel process using anunordum aluminium sulphate as the starting material. The effects of different preparing conditions on morphology characteristics of the membrane were investigated by scanning electron microscopy and 3D rotational microscopy. The preparing conditions include the amounts of drying control chemical additives （DCCA）, sintering procedure and sol-gel concentration. The results showed that PVA is a good crack-preventing reagent and the morphology of supported membranes was affected by ninny factors, including Al2O3 concentration, PVA/Al2O3 ratio, heating rate, membrane thickness and intrinsic defects of the substrate surface. 展开更多
关键词 supported Al2O3 membrane ammonium aluminium sulphate sol-gel method morphology.
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