Thermal Expansion and Mechanical Properties of Middle Reinforcement Content SiCp/Al Composites Fabricated by PM Technology  

作　　者：郝世明 谢敬佩 WANG Aiqin WANG Wenyan LI Jiwen SUN Haoliang 

机构地区：[1]Physical Engineering College and Laboratory of Materials Physics of the Ministry of Education of China, Zhengzhou University [2]School of physics and engineering, Henan University of Science and Technology [3]College of Materials Science and Engineering, Henan University of Science and Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第4期660-664,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(51371077)

摘　　要：Middle reinforcement content SiCp/Al composites（Vp=30%, 35% and 40%） for precision optical systems applications were fabricated by powder metallurgy technology. The composites were free of porosity and SiC particles distributed uniformly in the composites. The mean linear coefficients of thermal expansion（20-100 ℃） of SiCp/Al composites ranged from 11.6×10-6 to 13.3×10-6 K-1 and decreased with an increase in volume fraction of SiC content. The experimental coeffi cients of thermal expansion agreed well with predicted values based on Kerner＇s model. The Brinell hardness increased from 116 to 147, and the modulus increased from 99 to 112 GPa for the corresponding composites. The tensile strengths were higher than 320 MPa, but no signifi cant increasing trend between tensile strength and SiC content was observed.Middle reinforcement content SiCp/Al composites（Vp=30%, 35% and 40%） for precision optical systems applications were fabricated by powder metallurgy technology. The composites were free of porosity and SiC particles distributed uniformly in the composites. The mean linear coefficients of thermal expansion（20-100 ℃） of SiCp/Al composites ranged from 11.6×10-6 to 13.3×10-6 K-1 and decreased with an increase in volume fraction of SiC content. The experimental coeffi cients of thermal expansion agreed well with predicted values based on Kerner＇s model. The Brinell hardness increased from 116 to 147, and the modulus increased from 99 to 112 GPa for the corresponding composites. The tensile strengths were higher than 320 MPa, but no signifi cant increasing trend between tensile strength and SiC content was observed.

关 键 词：metal-matrix composites particle-reinforcement coefficient of thermal expansion mechanical properties powder metallurgy 

分 类 号：TB333[一般工业技术—材料科学与工程] TQ174.758[化学工程—陶瓷工业]