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SiC-MoSi_2/ZrO_2-MoSi_2 coating to protect C/C composites against oxidation 认领 引用 被引量：8
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作者 付前刚 张佳平 +2 位作者 张正中 李贺军 孙粲 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2113-2117,共5页
To improve the oxidation resistance of carbon/carbon （C/C） composites in air at high temperatures, a SiC- MoSi2/ZrO2-MoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method.... To improve the oxidation resistance of carbon/carbon （C/C） composites in air at high temperatures, a SiC- MoSi2/ZrO2-MoSi2 coating was prepared on the surface of C/C composites by pack cementation and slurry method. The microstructures and phase compositions of the coated C/C composites were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The result shows that the SiC-MoSi2/ZrO2-MoSi2 coating is dense and crack-free with a thickness of 250-300 μm. The preparation and the high temperature oxidation property of the coated composites were investigated. The as-received coating has excellent oxidation protection ability and can protect C/C composites from oxidation for 260 h at 1773 K in air. The excellent anti-oxidation performance of the coating is considered to come from the formation of ZrSiO4, which improves the stability of the coating at high temperatures. 展开更多
关键词 carbon/carbon composites SiC-MoSi2/ZrO2-MoSi2 coating oxidation resistance
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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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Investigation of ZrO2 nanoparticles concentration and processing time effect on the localized PEO coatings formed on AZ91 alloy 认领 引用 被引量：10
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作者 Zeeshan Ur Rehman Dongjin Choi 《Journal of Magnesium and Alloys》 SCIE EI CAS 2019年第4期555-565,共11页
AZ91 Mg alloy was treated through a new localized PEO(Plasma Electrolytic Oxidation)coating approach,using electrolyte solutions with varying ZrO2 nanoparticles concentration(2-8 g/L)and processing times.With increase... AZ91 Mg alloy was treated through a new localized PEO(Plasma Electrolytic Oxidation)coating approach,using electrolyte solutions with varying ZrO2 nanoparticles concentration(2-8 g/L)and processing times.With increase in the ZrO2 concentration,several microstructural changes were observed including;formation of cluster-type structure,damage to the inner layers(∼30 min)and sealing of defects.Corrosion analysis of the final coatings was carried out using potentiodynamic polarization,electrochemical impedance spectroscopy and post-corrosion analysis.It was explored that highest corrosion resistance(Rp∼81.17 kΩcm^2)of the coatings was obtained for ZrO2∼2 g/L.However,higher concentration of the ZrO2 nanoparticles caused weak crystalline coating structure,due to unstable and lower intensity discharges,thus failed to offer high corrosion resistance performance. 展开更多
关键词 Magnesium alloy PEO coating ZrO2 Corrosion Nanoparticles addition
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Investigation on plasma-sprayed ZrO_2 thermal barrier coating on nickel alloy substrate 认领 引用 被引量：4
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作者 卢安贤 常鹰 蔡小梅 《Journal of Central South University of Technology》 2002年第4期225-228,共4页
The thermal barrier coatings with NiCrAlY alloy bonding layer, NiCrAlY Y 2O 3 stabilized ZrO 2 transition layer and Y 2O 3 stabilized ZrO 2 ceramic layer are prepared on nickel alloy substrates using the plasma spray ... The thermal barrier coatings with NiCrAlY alloy bonding layer, NiCrAlY Y 2O 3 stabilized ZrO 2 transition layer and Y 2O 3 stabilized ZrO 2 ceramic layer are prepared on nickel alloy substrates using the plasma spray technique. The relationship among the composition, structure and property of the coatings are investiga ted by means of optical microscope, scanning electronic microscope and the experiments of thermal shock resistance cycling and high temperature oxidation resistance. The results show that the structure design of introdu cing a transition layer between Ni alloy substrate and ZrO 2 ceramic coating guarantees the high quality and properties of the coatings; ZrO 2 coatings doped with a little SiO 2 possesses better thermal shock resistance and more excellent hot corrosion resistance as compared with ZrO 2 coating materials without SiO 2 ;the improvement in performance of ZrO 2 coating doped with SiO 2 is due to forming more dense coating structure by self closing effects of the flaws and pores in the ZrO 2 coatings. 展开更多
关键词 plasma spray Ni alloy substrate transition layer ZrO2 ceramic layer thermal barrier coating
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High temperature cyclic oxidation behavior of Y_2O_3-ZrO_2 thermal barrier coatings irradiated by high-intensity pulsed ion beam 认领 引用
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作者 王一奇 雷明凯 +1 位作者 AFSAR A M SONG J I 《Journal of Central South University》 SCIE EI CAS 2009年第1期13-17,共5页
The high-temperature oxidation resistance behavior of 7% （mass fraction） Y203-ZrO2 thermal barrier coatings （TBCs） irradiated by high-intensity pulsed ion beam （HIPIB） was investigated under the cyclic oxidation... The high-temperature oxidation resistance behavior of 7% （mass fraction） Y203-ZrO2 thermal barrier coatings （TBCs） irradiated by high-intensity pulsed ion beam （HIPIB） was investigated under the cyclic oxidation condition of 1 050 ℃ and 1 h. The columnar grains in the TBCs disappear after the HIPIB irradiation at ion current densities of 100-200 A/cm^2 and the irradiated surface becomes smooth and densified after remelting and ablation due to the HIPIB irradiation. The thermally grown oxide （TGO） layer thickness of the irradiated TBCs is smaller than that of the original TBCs. After 15 cycles, the mass gains of the original TBCs and those irradiated by ion current densities of 100 and 200 A/cm^2 due to the oxidation are found to be 0.8-0.9, 0.6-0.7, and 0.3-0.4 mg/cm^2, respectively. The inward diffusion of oxygen through the irradiated TBCs is significantly impeded by the densified top layer formed due to irradiation, which is the main reason for the improved overall oxidation resistance of the irradiated TBCs. 展开更多
关键词 Y2O3 ZrO2 thermal barrier coating high-intensity pulsed ion beam electron beam physical vapor deposition oxidation resistance cyclic oxidation
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FABRICATION OF TRANSPARENT PU/ZrO2 NANOCOMPOSITE COATINGS WITH HIGH REFRACTIVE INDEX 认领 引用
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作者 Kun Xu Yi-qing Hu 《Chinese Journal of Polymer Science》 SCIE EI CAS 2010年第1期13-20,共8页
Transparent ZrO2-polyurethane nanocomposites with high refractive index were prepared by dispersing ZrO2 nanoparticles in a polyurethane matrix via ligand molecule engineering.TEM showed that the inorganic particles w... Transparent ZrO2-polyurethane nanocomposites with high refractive index were prepared by dispersing ZrO2 nanoparticles in a polyurethane matrix via ligand molecule engineering.TEM showed that the inorganic particles were well dispersed within the polymeric network with no significant macroscopic agglomeration.By controlling the phase separation it was possible to obtain transparent zirconia nanostructured coatings,characterized by improved mechanical and thermal properties.UV-Vis spectra indicated that the coatings still maintained transparency in the visible light.The refractive index of the UV-cured films depends linearly on the ZrO2 content and varies from 1.475 to 1.625(20 wt%)at 633 nm.These coatings could find advanced applications in coatings of optical and electronic devices. 展开更多
关键词 Coatings Nanocomposites Photopolymerization Refractive index ZrO2
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Comparative study on corrosion behavior of plasma sprayed Al_2O_3, ZrO_2, Al_2O_3/ZrO_2 and ZrO_2/Al_2O_3 coatings 认领 引用 被引量：6
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作者 S.SATHISH M.GEETHA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第5期1336-1344,共9页
ZrO2, Al2O3, ZrO2/Al2O3 and Al2O3/ZrO2 coatings were fabricated on low carbon steel using atmospheric plasma spraying technique. The microstructure and phase composition of the as-sprayed coatings were examined by sca... ZrO2, Al2O3, ZrO2/Al2O3 and Al2O3/ZrO2 coatings were fabricated on low carbon steel using atmospheric plasma spraying technique. The microstructure and phase composition of the as-sprayed coatings were examined by scanning electron microscopy （SEM） and X-ray diffraction （XRD）, respectively. The polarization test, salt spray test and immersion test were used to investigate the corrosion behavior of the coatings in 3.5% NaCl solution. The results suggested that the bilayered Al2O3/ZrO2 coating exhibits superior corrosion resistance when compared with the other coatings. This is ascribed to the presence of very few interconnected pores and stable phases in the coating. 展开更多
关键词 bilayered coating Al2O3 ZrO2 atmospheric plasma spraying corrosion
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Effect of ZrO_2 (9mol% Y_2O_3) coating thickness on the electronic conductivity of Mg-PSZ oxygen sensors 认领 引用 被引量：2
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作者 ChangheGao HaileiZhao QingguoLiu WeijiangWu WeihuaQiu 《Journal of University of Science and Technology Beijing》 2005年第2期160-165,共6页
The ZrO2 (9mol% Y2O3) coating was prepared evenly on the surface of MgO partially stabilized zirconia (Mg-PSZ) tube (oxygen sensor probe) by dipping the green Mg-PSZ tube in a ZrO2 (9mol% Y2O3) slurry and then co-firi... The ZrO2 (9mol% Y2O3) coating was prepared evenly on the surface of MgO partially stabilized zirconia (Mg-PSZ) tube (oxygen sensor probe) by dipping the green Mg-PSZ tube in a ZrO2 (9mol% Y2O3) slurry and then co-firing at 1750°C for 8 h. The double-cell method was employed to measure the electronic conductivity parameter and exam the reproducibility of the coated Mg- PSZ tube. The experimental results indicate that the good thermal shock resistance of the Mg-PSZ tube can be retained when the coating thickness is not more than 3.4 μm. The ZrO2 (9mol% Y2O3) coating reduces the electronic conductivity parameter remarka- bly, probably due to the lower electronic conductivity of Y2O,-stabilized ZrO2 than that of MgO-stabilized ZrO2. Moreover, the ZrO2 (9mol% Y2O3) coating can improve the reproducibility and accuracy of the Mg-PSZ tube significantly in the low oxygen measure- ment. The smooth surface feature and lower electronic conductivity of the coated Mg-PSZ tube should be responsible for this im- provement. 展开更多
关键词 oxygen sensor stabilized ZrO2 solid electrolyte coating electronic conductivity
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Al-Ti-O/ZrO2涂层高温性能的研究 认领 引用 被引量：1
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作者 鲜广 赵海波 +2 位作者 鲜丽君 何洪 王晨丞 《工具技术》 2020年第11期32-36,共5页
采用阴极电弧离子镀方法在镍基高温合金表面制备了Al-Ti-O/ZrO2涂层,采用扫描电镜和X射线衍射仪分析了涂层的组织形貌、成分和物相结构。结果表明,Al-Ti-O/ZrO2涂层是以Al-Ti-O层与ZrO2层交替堆积形成的层状组织,从表面观察到涂层组织... 采用阴极电弧离子镀方法在镍基高温合金表面制备了Al-Ti-O/ZrO2涂层,采用扫描电镜和X射线衍射仪分析了涂层的组织形貌、成分和物相结构。结果表明,Al-Ti-O/ZrO2涂层是以Al-Ti-O层与ZrO2层交替堆积形成的层状组织,从表面观察到涂层组织呈球状;涂层的物相由m-ZrO2、t-ZrO2、TiO2和α-Al2O3组成。Al-Ti-O/ZrO2涂层与基底之间的NiCoCrAlSiY合金粘结层具有改善涂层结合性的作用,压痕法测试Al-Ti-O/ZrO2涂层与镍基高温合金基底的结合等级为HF2。高温处理试验表明,Al-Ti-O/ZrO2涂层有效保护了镍基高温合金,经过1000℃~1200℃高温保温2h后,有Al-Ti-O/ZrO2涂层的镍基高温合金表面仍然完整;Al-Ti-O/ZrO2涂层经过1100℃及以上温度的高温处理后,α-Al2O3的结晶度明显改善。隔热试验表明,Al-Ti-O/ZrO2涂层在850℃恒温条件下的隔热温度达35℃以上。 展开更多
关键词 阴极电弧离子镀 Al-Ti-O/ZrO2涂层 高温处理 抗氧化性 隔热
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Crystalline texture evolution, control of the tribocorrosion behavior, and significant enhancement of the abrasion properties of a Ni-P nanocomposite coating enhanced by zirconia nanoparticles 认领 引用 被引量：9
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作者 Masoud Sabzi Saeid Mersagh Dezfuli Zohre Balak 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第8期1020-1030,共11页
This paper describes an investigation of the effect of ZrO2 nanoparticles on the abrasive properties,crystalline texture developments,and tribocorrosion behavior of Ni-P nanostructured coatings.In the investigation,Ni... This paper describes an investigation of the effect of ZrO2 nanoparticles on the abrasive properties,crystalline texture developments,and tribocorrosion behavior of Ni-P nanostructured coatings.In the investigation,Ni-P and Ni-P-ZrO2 nanostructured coatings are deposited on St52 steel via the electroless method.Transmission electron microscopy(TEM),field emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS),cyclic-static polarization tests in 3.5wt%NaCl solution,the tribocorrosion test(by back-and-forth wear in electrochemical cell),and the microhardness test using the Vickers method were performed to characterize and analyze the deposited coatings.The results of this study showed that the addition of ZrO2 nanoparticles to the Ni-P electroless bath produced the following:a sharp increase in wear and hardness resistance,the change of the wear mechanism from sheet to adhesive mode,the reduction of pitting corrosion resistance,significant reduction in the tribocorrosion protective properties,change in the preferred orientation of the crystalline texture coating from(111)to(200),increase in the sedimentation rate during the deposit process,and a sharp increase in the thickness of the Ni-P nanostructured coatings. 展开更多
关键词 Ni-P nanocomposite coatings ZrO2 nanoparticles crystalline texture corrosion resistance abrasive properties tribocorrosion behavior
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Densification and Structure Evolution of ZrB2-ZrO2 Composites Prepared by Plasma Activated Sintering using ZrB2@ZrO2 Powder 认领 引用 被引量：1
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作者 YANG Haitao ZHANG Jian +1 位作者 LI Junguo SHEN Qiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2021年第2期215-222,共8页
The densification and the structure evolution of the plasma activated sintered(PAS sintered)ZrB2-ZrO2 composite via the ZrO2-coated ZrB2 powder(ZrB2@ZrO2)prepared by in situ passivation method were i... The densification and the structure evolution of the plasma activated sintered(PAS sintered)ZrB2-ZrO2 composite via the ZrO2-coated ZrB2 powder(ZrB2@ZrO2)prepared by in situ passivation method were investigated.The composition and microstructure were characterized by XRD,Raman,SEM,and EDS techniques.The coated powder has excellent sintering performance.The relative density of the composite reaches above 90%at 1200℃,and the main sintering process occurs between ZrO2 particles.While at above 1500℃,the relative density reaches above 95%and the main sintering process occurs between ZrB2 and ZrO2 particles.With the increase of ZrO2 coating content,the structure of the sintered body changes from ZrB2 continuous network structure to island structure.When the content is 20%,an island structure is formed.Increasing the ZrO2 content further causes the overheating of ZrO2.Thus,the best sintering performance reaches when the coating content is 20wt%. 展开更多
关键词 ZrB2 ZrO2 coating content densification structure evolution
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ZrO_2涂层对基底阻尼特性的影响 认领 引用 被引量：2
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作者 杜广煜 谭祯 +1 位作者 蔺增 巴德纯 《东北大学学报（自然科学版）》 EI CAS CSCD 北大核心 2018年第10期1501-1505,共5页
通过电子束物理气相沉积的方法在TC4基体上制备ZrO_2涂层,探究其对基底阻尼作用的影响机理.通过SEM和XRD对涂层的表面形貌和结构特性进行表征,并利用动态力学分析仪(DMA)检测涂层的阻尼性能.结果表明:随着基体温度的升高,晶粒尺寸变大,... 通过电子束物理气相沉积的方法在TC4基体上制备ZrO_2涂层,探究其对基底阻尼作用的影响机理.通过SEM和XRD对涂层的表面形貌和结构特性进行表征,并利用动态力学分析仪(DMA)检测涂层的阻尼性能.结果表明:随着基体温度的升高,晶粒尺寸变大,微缺陷减小,薄层损耗因子产生混合取向,损耗因子增加,阻尼性能提高.在高频下,由于补偿效果,涂层中混晶取向的晶界缺陷消失,阻碍了涂层阻尼性能进一步提高.基底温度为400℃,激振频率为55 Hz时阻尼性能最好. 展开更多
关键词 阻尼特性 ZrO2涂层 微观结构 动态力学分析仪 电子束物理气相沉积
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ZrO_2-modified Ni/LaAl11O18 catalyst for CO methanation: Effects of catalyst structure on catalytic performance 认领 引用 被引量：4
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作者 Hongmei Ai Hongyuan Yang +3 位作者 Qing Liu Guoming Zhao Jing Yang Fangna Gu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第2期297-308,共12页
We report Ni/LaHA@ZrO2catalysts prepared by a facile modified successive adsorption and reaction method for CO methanation.N2adsorption,X‐ray diffraction,transmission electron microscopy,scanning electron microscopy,... We report Ni/LaHA@ZrO2catalysts prepared by a facile modified successive adsorption and reaction method for CO methanation.N2adsorption,X‐ray diffraction,transmission electron microscopy,scanning electron microscopy,thermogravimetric analysis,H2temperature‐programmed reduction,H2temperature‐programmed desorption,X‐ray photoelectron spectroscopy,thermogravimetric analysis,and inductively coupled plasma atomic emission spectrometry were used to characterize the samples.The results indicated that the ZrO2nanoparticles were distributed over the surface of the Ni/LaHA@ZrO2catalyst and even partially covered some Ni particles,resulting in the coating exerting a confinement effect.The excess ZrO2had an adverse effect on the enhancement of CO conversion because of the coverage of the surface Ni particles;however,the Ni/LaHA@ZrO2catalyst displayed much higher CH4selectivity than Ni/LaHA because of the activation of the byproduct CO2molecules by ZrO2species.Therefore,even though20Ni/LaHA@ZrO2‐5exhibited similar CO conversion as20Ni/LaHA,the use of the former resulted in a higher CH4yield than the use of the latter.A107‐h‐lifetime test revealed that the Ni/LaHA@ZrO2catalyst was highly stable with superior anti‐sintering and anti‐coking properties because of its coating structure and the promoter effect of ZrO2. 展开更多
关键词 Lanthanum hexaaluminate ZrO2 Nickel catalyst Coating structure CO methanation
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Influence of Microstructures on Thermal Shock and Sintering Behavior of YSZ-based Thermal Barrier Coatings 认领 引用
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作者 Kirsten Bobzin Lidong Zhao +1 位作者 Mehmet ?te Tim K?nigstein 《表面技术》 EI CAS CSCD 北大核心 2019年第4期28-33,共6页
In this study, two thermal barrier coatings based on YSZ were produced by using a commercially available agglomerated and sintered powder and a special spray powder prepared by high energy ball milling. Both thermal b... In this study, two thermal barrier coatings based on YSZ were produced by using a commercially available agglomerated and sintered powder and a special spray powder prepared by high energy ball milling. Both thermal barrier coatings exhibited similar overall porosities, but significantly different microstructures. Application of the special spray powder prepared by high energy ball milling led to a microstructure with numerous inclusions of semi-molten agglomerates, which introduced a plethora of clusters of fine pores into the coating and several more microstructural defects. This microstructure resulted in a significantly better thermal shock behavior compared to the conventional thermal barrier coating. The heat treatment of both thermal barrier coatings atθ=1150℃for t=100 h led to a sintering of both coatings. The results were reduced overall porosity and significantly increased fracture toughness. A correlation between the fracture toughness of both coatings after the heat treatment and the thermal shock life time could not be identified. 展开更多
关键词 thermal barrier coating ZrO2-7%Y2O3 high energy ball milling thermal shock
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Microstructure modification of Y2O3 stabilized ZrO2 thermal barrier coatings by laser glazing and the effects on the hot corrosion resistance 认领 引用 被引量：30
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作者 Lei GUO Hui XIN +2 位作者 Zhao ZHANG Xinmu ZHANG Fuxing YE 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2020年第2期232-242,共11页
Y2O3 stabilized ZrO2(YSZ)thermal barrier coatings(TBCs)are prone to hot corrosion by molten salts.In this study,the microstructure of atmospheric plasma spraying YSZ TBCs is modified by laser glazing in order to impro... Y2O3 stabilized ZrO2(YSZ)thermal barrier coatings(TBCs)are prone to hot corrosion by molten salts.In this study,the microstructure of atmospheric plasma spraying YSZ TBCs is modified by laser glazing in order to improve the corrosion resistance.By optimizing the laser parameters,a^18μm smooth glazed layer with some vertical cracks was produced on the coating surfaces.The as-sprayed and modified coatings were both exposed to hot corrosion tests at 700 and 1000℃for 4 h in V2O5 molten salt,and the results revealed that the modified one had improved corrosion resistance.After hot corrosion,the glazed layer kept structural integrity,with little evidence of dissolution.However,the vertical cracks in the glazed layer acted as the paths for molten salt penetration,accelerating the corrosion of the non-modified coating.Further optimization of the glazed layer is needed in the future work. 展开更多
关键词 thermal barrier coatings(TBCs) air plasma spraying(APS) Y2O3 stabilized ZrO2 microstructure modification laser glazing V2O5 corrosion
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