Al_2O_3修饰3D-SiC/Al复合材料的制备与性能  

Preparation and properties of Al_2O_3 modify 3D-SiC/Al composite materials

作　　者：张大川[1] 汪冬梅[1] 郑治祥[1] 吴玉程[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《功能材料》2017年第5期5211-5215,共5页Journal of Functional Materials

基　　金：国家国际科技合作专项资助项目(2014DFA50860)

摘　　要：用Al_2O_3作为界面修饰剂,通过反应烧结,在SiC颗粒之间形成莫来石界面,制备SiC预制件,采用无压熔渗法制备3D-SiC/Al互穿式连续结构复合材料。基于正交实验研究了Al_2O_3添加量、预制件烧结时间、熔渗温度和熔渗时间对3D-SiC/Al复合材料抗弯强度和热导率的影响。实验结果表明,Al_2O_3添加量对复合材料抗弯强度和热导率影响显著,复合材料获得最大抗弯强度344 MPa和热导率165 W/(m·K)的制备工艺为:氧化铝添加量2.0%(原子分数),预制件烧结时间2h,熔渗温度950℃,熔渗时间1h。Using Al2O3 as modifier to reactively sinter SiC preforms and form mullite interface between SiC particles, a 3D_SiC/Al interpenetrated composite was fabricated by pressureless infiltration technique. The influence of Al2O3 content, preform sintering time, infiltration temperature and infiltration time on the bending strength and thermal conductivity of 3D-S1C/A1 composite were investigated through orthogonal experiment. The results showed that A1203 content had a significant effect to the bending strength and thermal conductivity, the optimal bending strength of 344Mpa and thermal conductivity of 165 W/（m K） were obtained under the conditions of 2. Oat% Al2O3 content, 2 h preform sintering time, 950 °C infiltration temperature and 1 h infiltration time.

关 键 词：抗弯强度 无压熔渗 互穿式连续结构碳化硅铝复合材料 氧化铝修饰 

分 类 号：TB333[一般工业技术—材料科学与工程]