用Al2O3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Al2O3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,Al2O3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2 h,熔渗温度950 ℃,熔渗时间1 h.
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-SiC/Al composite were investigated through orthogonal experiment.The results showed that Al2O3 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 2.0at% Al2O3 content, 2 h preform sintering time, 950 ℃ infiltration temperature and 1 h infiltration time.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%