Near-net-shape Preparation and Properties of SiC<sub>p</sub>/A356 Composites Baseplate

Zhang Jianyun; Yu Zhihua; Zou Aihua; Zhou Xianliang

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Near-net-shape Preparation and Properties of SiC_p/A356 Composites Baseplate
Vol. 29, Issue 4, Pages: 298-300(2009)
Published： 2009 ，
DOI：

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[1]张建云,余志华,邹爱华,周贤良.SiC_p/A356复合材料基片的近净成形工艺及性能[J].特种铸造及有色合金,2009,29(04):298-300+287.

Zhang Jianyun, Yu Zhihua, Zou Aihua, et al. Near-net-shape Preparation and Properties of SiC_p/A356 Composites Baseplate. [J]. Special Casting & Nonferrous Alloys 29(4):298-300(2009)
[1]张建云,余志华,邹爱华,周贤良.SiC_p/A356复合材料基片的近净成形工艺及性能[J].特种铸造及有色合金,2009,29(04):298-300+287. DOI：

Zhang Jianyun, Yu Zhihua, Zou Aihua, et al. Near-net-shape Preparation and Properties of SiC_p/A356 Composites Baseplate. [J]. Special Casting & Nonferrous Alloys 29(4):298-300(2009) DOI：

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。

Abstract

Near-net-shape SiC

/A356 composites baseplate was successfully prepared with SiC

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

2.46）×10-6 K-1 and at 110.001

4.282W/（m·K）

respectively

at 50

00℃. The ambient bending strength of the composites baseplate reaches 210.8MPa.