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Synthesis and Dielectric Properties of Submicron CaTiO_3 Powders by Mechanical Ball-milling Method
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作者 王焕平 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第B12期837-840,共4页
The synthesis and dielectric properties of calcium titanate (CaTiO3) submicron powder synthesized by mechanical ball-milling method have been investigated in this paper. With the ball-milling time increased, the siz... The synthesis and dielectric properties of calcium titanate (CaTiO3) submicron powder synthesized by mechanical ball-milling method have been investigated in this paper. With the ball-milling time increased, the size of CaTiO3 particles decreased from micron to submicron, and a great deal of nanoparticles (50-100 nm) occurred. The CaTiO3 ceramics made from submicron powders achieved compact structure at the sintering temperature of 1 250℃, and had good dielectric properties: εr=171, Q×f= 4 361 GHz, τf =+782 ppm/+C, IR=6.5×10^12Ω, which was a similar result compared with the CaTiO3 ceramics made from nanoparticles by sol-gel method. 展开更多
关键词 CATIO3 submicron powder dielectric properties
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Effect of Submicron SiO_(2) Powder Addition on Properties of Cement Free Iron Trough Castables 被引量:1
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作者 CHENG Shuiming CHEN Jinfeng +2 位作者 WEI Jianxiu CAI Wei ZHAO Huizhong 《China's Refractories》 CAS 2022年第3期9-13,共5页
A new cement free iron trough castable was prepared with dense corundum and silicon carbide as the main raw materials and submicron SiO_(2) powder(d_(50)=0.242μm,SiO_(2)=99.9 mass%)as the binder.The effect of the sub... A new cement free iron trough castable was prepared with dense corundum and silicon carbide as the main raw materials and submicron SiO_(2) powder(d_(50)=0.242μm,SiO_(2)=99.9 mass%)as the binder.The effect of the submicron SiO_(2) powder addition(3%,4%,5%,6%,7%,8%,and 9%,by mass,respectively)on the properties of the prepared castables was studied.The working mechanism of submicron SiO_(2) powder was analyzed from the perspective of the particle size distribution and infrared absorption spectrum.The results show that:(1)cement free iron trough castables can be prepared using submicron SiO_(2) powder alone as the binder;(2)compared with traditional castables,the cement free castables have made a breakthrough in the water addition and hot modulus of rupture.The optimal submicron SiO_(2) powder addition is 4%-6%. 展开更多
关键词 iron trough castable cement free submicron SiO_(2)powder microstructure
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Microstructure and Tensile Properties of Yttria Coated-Alumina Particulates Reinforced Aluminum Matrix Composites 被引量:2
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作者 Zhiqiang YU, Gaohui WU, Longtao JIANG and Dongli SUNSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaPresent address: Department of Materials Science, Fudan University, Shanghai 200433, ChinaPh.D., to 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第1期68-70,共3页
The liquid-phase coating method was used to deposit Y2O3 ceramic on the surface of α-Al2O3. The coated-Al2O3p/6061AI composites were produced using squeeze casting technology. The microstructure and tensile propertie... The liquid-phase coating method was used to deposit Y2O3 ceramic on the surface of α-Al2O3. The coated-Al2O3p/6061AI composites were produced using squeeze casting technology. The microstructure and tensile properties of the composites were analysed and studied. The results showed that the coated AI2O3 particles are able to disperse homogeneously in the aluminum liquid. The microstructure of the composites is more even in comparison with that of as-received powders. The tensile testing indicated that mechanical properties of the coated-AI2O3p/6061AI composites are better than those of uncoated particles. In the composite with 30% volume fraction, the tensile strength, yield strength as well as elongation is increased by 29.8%, 38.4% and 10.3%, respectively. The SEM analysis of fracture indicated that the dimples of the coated-Al2O3p/6061Al composites are more even. 展开更多
关键词 submicron alumina powders Rare-earth oxide coating MICROSTRUCTURE Mechanical properties Aluminum matrix composite
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Fabrication and Pressureless Sintering of Silicon Carbide Refractories
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作者 GUO Junhua WANG Wenwu +1 位作者 CAO Huiyan XU Haiyang 《China's Refractories》 CAS 2021年第4期40-44,共5页
This work studies the fabrication and pressureless sintering of silicon carbide(SiC)refractories.SiC particles were adopted as aggregates,introducing different amounts(20%,30%,40%,50%,and 60%,by mass)of submicron SiC ... This work studies the fabrication and pressureless sintering of silicon carbide(SiC)refractories.SiC particles were adopted as aggregates,introducing different amounts(20%,30%,40%,50%,and 60%,by mass)of submicron SiC powder,adding resin as the binder and the carbon source,and B4C as the sintering aid.It is found that when the mass ratio of B4C to the submicron SiC powder is 3%,the optimal sintering can be obtained.With the increase of the submicron powder addition,the sintering linear shrinkage increases and the mechanical properties enhance.The optimal sintering temperature is 2050-2100℃. 展开更多
关键词 silicon carbide refractories submicron silicon carbide powder pressureless sintering
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