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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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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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Modeling and analysis of porosity and compressive strength of gradient Al_2O_3-ZrO_2 ceramic lter using BP neural network 认领 引用 被引量：1
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作者 Li Qiang Zhang Fengfeng +1 位作者 Yu Jingyuan Tang Ji 《China Foundry》 SCIE CAS 2013年第4期227-231,共5页
BP neural network was used in this study to model the porosity and the compressive strength of a gradient Al2Q-ZrO2 ceramic foam filter prepared by centrifugal slip casting. The influences of the load applied on the e... BP neural network was used in this study to model the porosity and the compressive strength of a gradient Al2Q-ZrO2 ceramic foam filter prepared by centrifugal slip casting. The influences of the load applied on the epispastic polystyrene template （F）, the centrifugal acceleration （V） and sintering temperature （T） on the porosity （P） and compressive strength （a） of the sintered products were studied by using the registered three-layer BP model. The accuracy of the model was verified by comparing the BP model predicted results with the experimental ones. Results show that the model prediction agrees with the experimental data within a reasonable experimental error, indicating that the three-layer BP network based modeling is effective in predicting both the properties and processing parameters in designing the gradient Al203-ZrO2 ceramic foam filter. The prediction results show that the porosity percentage increases and compressive strength decreases with an increase in the applied load on epispastic polystyrene template. As for the influence of sintering temperature, the porosity percentage decreases monotonically with an increase in sintering temperature, yet the compressive strength first increases and then decreases slightly in a given temperature range. Furthermore, the porosity percentage changes little but the compressive strength first increases and then decreases when the centrifugal acceleration increases. 展开更多
关键词 gradient Al203-ZrO2 ceramic foams centrifugal process parameters BP neural network porosity compressive strength
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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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(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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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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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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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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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：4
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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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Preparation of Crack-free 3Y-TZP/Al_2O_3 Composite Ceramic Fiber by Electrolysis-sol-gel Method 认领 引用 被引量：7
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作者 LI Jian-jun JIAO Xiu-ling CHEN Dai-rong 《Chemical Research in Chinese Universities》 SCIE CAS 2007年第4期377-380,共4页
Polycrystalline 3Y-TZP/Al2O3 tetragonal zirconia fiber was obtained by the pyrolysis of gel fibers using zirconium oxychloride octahydrate（ZOC） as the raw material. The spinnable zirconia sol was prepared by electro... Polycrystalline 3Y-TZP/Al2O3 tetragonal zirconia fiber was obtained by the pyrolysis of gel fibers using zirconium oxychloride octahydrate（ZOC） as the raw material. The spinnable zirconia sol was prepared by electrolyzing the zirco-nium oxychloride octahydrate（ZOC） solution in the presence of acetic acid and sugar（ sucrose, glucrose or fructose） , in which the molar ratios of CH3 COOH/ZOC and sugar/ZOC were 1.0-4.0 and 0.2-0.4, respectively. The pre- pared tetragonal zireonia fibers sintered at different temperatures showed smooth and crack-free surfaces with diame, ters of 5-10 μm. The addition of Al2O3 enhanced the sintering process and prevented the crystals from growing. Thermogravimetric analysis（TG）, X-ray diffraction （ XRD ）, Fourier transform infrared spectroscopy（FTIR）, and scanning electron microscope（SEM） techniques were used to characterize the prepared fibers. 展开更多
关键词 Electrolysis Sol-gel Zirconia Ceramic fiber Al2O3
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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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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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Effect of Al powder and silica sol on the structure and mechanical properties of Al_2O_3-ZrO_2 foams 认领 引用 被引量：1
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作者 H.Sharifi M.Divandari +1 位作者 A.Khavandi M.H.Idris 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS 2010年第4期241-247,共7页
Polymeric sponge replication method is one of the common ways for ceramic foam production. The existence of central triangular voids in the struts results in a decrease of mechanical properties limiting their applicat... Polymeric sponge replication method is one of the common ways for ceramic foam production. The existence of central triangular voids in the struts results in a decrease of mechanical properties limiting their applications. To remove this defect, some additives consisting of Al powder particles and silica sol are added to ceramic slurries consisting of Al2O3 and ZrO2 （partially stabilized zirconia）. With increasing temperature for pyrolyzing and sintering of raw materials, first the Al powder and then the glass phase which consisted of melted Al2O3, ZrO2 and SiO2 was soaked into hollow struts. SEM investigations showed that the center of foam struts were free of hollows. XRD considerations depicted that a ZrO2 phase with tetragonal crystallographic structure is present in the produced foam which could be the reason of improved toughness and mechanical properties. Compressive strength of foams increased significantly due to the decrease of closed porosity. The Weibull statistical study showed remarkable increasing of the Weibull module and its value for foams with 10, 20 and 30 ppi was 5.91, 6.06 and 6.53 respectively. 展开更多
关键词 Ceramic foam Processing Strut structure Al2O3-ZrO2 Weibull modulus
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微波烧结和常压烧结对Al_2O_3-ZrO_2陶瓷磨损行为的影响 认领 引用 被引量：17
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作者 张锐 高濂 +2 位作者 江琳沁 郭景坤 张锐 《无机材料学报》 SCIE EI CAS 北大核心 2002年第3期621-626,共6页
采用多模微波烧结系统和常压烧结,对Al2O3－ZrO2复合材料的基本性能进行了研究,提出了相关的磨损机理．与常压烧结相比,微波烧结可以提高ZTA陶瓷的密度、强度和韧性,使其结构均匀,耐磨性提高．常压烧结样品的磨损主要是晶粒铲平、磨屑... 采用多模微波烧结系统和常压烧结,对Al2O3－ZrO2复合材料的基本性能进行了研究,提出了相关的磨损机理．与常压烧结相比,微波烧结可以提高ZTA陶瓷的密度、强度和韧性,使其结构均匀,耐磨性提高．常压烧结样品的磨损主要是晶粒铲平、磨屑填充体内气孔形成光滑的磨损界面;而微波烧结ZTA陶瓷主要是界面晶粒剥离脱落磨损．载荷的增加使磨损量增大． 展开更多
关键词 微波烧结 常压烧结 Al2O3-ZrO2陶瓷 磨损行为 ZTA 氧化铝 氧化锆 复合陶瓷
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Al_2O_3-ZrO_2复合膜的制备与表征 认领 引用 被引量：11
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作者 郝艳霞 李健生 +2 位作者 杨绪杰 陆路德 汪信 《无机化学学报》 SCIE CAS 北大核心 2002年第3期245-248,共4页
以异丙醇铝和氧氯化锆为原料,用溶胶-凝胶法在Al2O3中空纤维上制备了Al2O3-ZrO2复合膜。应用TG、DTA、XRD、SEM等测试手段对复合膜的热稳定性、结构、形貌进行了表征。结果表明复合膜的热稳定性比单一由氧化铝或氧化锆制成的膜有显著的... 以异丙醇铝和氧氯化锆为原料,用溶胶-凝胶法在Al2O3中空纤维上制备了Al2O3-ZrO2复合膜。应用TG、DTA、XRD、SEM等测试手段对复合膜的热稳定性、结构、形貌进行了表征。结果表明复合膜的热稳定性比单一由氧化铝或氧化锆制成的膜有显著的提高,在1100℃之前,复合膜以t-ZrO2存在,1200℃时,出现了m-ZrO2和α-Al2O3相。扫描电镜分析表明,膜表面完整、无缺陷。气体渗透实验进一步表明所得膜具有一定的气体选择性,0.3MPa和0.5MPa下对氮气和氩气的分离因子α分别为1.191和1.185,和氮气与氩气的理论分离因子(α=1.194)相当,说明气体通过膜的扩散以Knudsen扩散传质为主。用等温氮气吸附实验测定了非担载膜的孔径大小和分布,最可几孔径约为4.3nm。 展开更多
关键词 Al2O3-ZrO2复合膜 溶胶-凝胶 制备 表征 异丙醇铝 氧氯化锆 氧化铝 氧化锆 无机陶瓷膜
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铝粉、硅粉加入比例对Al_2O_3-ZrO_2-C材料力学性能的影响 认领 引用 被引量：10
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作者 易献勋 李亚伟 +3 位作者 桑绍柏 童贝 金胜利 樊海兵 《耐火材料》 CAS 北大核心 2011年第3期180-183,190,共4页
在A l2O3-ZrO2-C材料中加入总质量分数为5%的铝粉和硅粉,改变试样中铝粉和硅粉的质量比(分别为0:1、1:4、2:3和4:1),经配料、混练、成型、烘干后,在埋炭(煤焦炭)气氛中分别于800、1 000、1 300和1 400℃保温3 h煅烧,然后对烧后试样进行... 在A l2O3-ZrO2-C材料中加入总质量分数为5%的铝粉和硅粉,改变试样中铝粉和硅粉的质量比(分别为0:1、1:4、2:3和4:1),经配料、混练、成型、烘干后,在埋炭(煤焦炭)气氛中分别于800、1 000、1 300和1 400℃保温3 h煅烧,然后对烧后试样进行三点弯曲试验,并测定烧后试样的平均孔径,分析烧后试样的显微结构。结果表明:铝粉、硅粉的加入比例显著影响A l2O3-ZrO2-C材料的力学性能:经800和1 000℃煅烧后,试样的抗折强度、弹性模量和韧性均随铝粉加入量的增加而增大,而经1 300和1 400℃煅烧后,试样的抗折强度、弹性模量和韧性均随铝粉加入量的增加而减小;试样的平均孔径呈现出与力学性能相反的变化规律。上述这些变化规律是铝液的促烧结作用与高温下生成SiC、A lN晶须的强韧化作用和填隙作用以及生成A lN过多导致的结构疏松作用共同作用的结果。 展开更多
关键词 Al2O3-ZrO2-C 力学性能 显微结构 孔径分布
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