摘要
采用SiCp预制坯成形及无压浸渗法相结合的工艺,实现了SiCp/A356复合材料基片的近净成形。研究了SiCp预制坯烧结后的连接机理,以及浸渗温度及浸渗时间对复合材料相对密度的影响,并对SiCp/A356复合材料基片的性能做了测试。结果表明,SiCp烧结后表层生成的SiO2对SiCp多孔陶瓷预制坯起连接作用;基片材料的相对密度随着浸渗温度及浸渗时间的增加而提高;在50～200℃温度范围内,基片材料热膨胀系数变化范围为(11.15～12.46)×10-6K-1,热导率为110.001～94.282W.m-1.K-1;常温抗弯强度为210.8MPa。
Near-net-shape SiC_p/A356 composites baseplate was successfully prepared with SiC_p preform by pressureless infiltration method. Bonding mechanism of sintered SiC preform, and effects of infiltration temperature and infiltration time on the relative density of the composites were approached. Meanwhile, properties of the composites baseplate were tested. The results reveal that SiO2 phase generated on the surface layer of sintered SiC is responsible for the bonding role in SiC porous preform. Relative density of the composites baseplate is increased with increasing in infiltration temperature and infiltration time. Thermal expansion coefficient and thermal conductivity of the composites baseplate vary at (11.15~12.46)×10-6 K-1 and at 110.001~94.282W/(m·K), respectively, at 50~200℃. The ambient bending strength of the composites baseplate reaches 210.8MPa.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2009年第4期298-300,共3页
Special Casting & Nonferrous Alloys
基金
江西省自然科学基金资助项目(2007GZC1634)
江西省教育厅科技基金资助项目(GJJ08233)
关键词
铝基复合材料
SiCp预制坯
无压浸渗
热物理性能
抗弯强度
Aluminum Matrix Composites, SiC_p Preform, Pressureless Infiltration, Thermo-physical Properties, Bending Strength
