Near-net shaped Al/SiCP composites via vacuum-pressure infiltration combined with gelcasting

被引：2

作者：

DONG C.-G. ^{[1
,2
]}

WANG R.-C. ^{[1
,2
]}

CHEN Y.-X. ^{[1
,2
]}

WANG X.-F. ^{[1
,2
]}

PENG C.-Q. ^{[1
]}

ZENG J. ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, Central South University, Changsha

[2] Hunan Provincial Key Laboratory of Electronic Packaging and Advanced Functional Materials, Changsha

来源：

Transactions of Nonferrous Metals Society of China (English Edition) | 2020年 / 30卷 / 06期

关键词：

Al/SiC[!sub]P[!/sub] composites; gelcasting; microstructure; properties; vacuum-pressure infiltration;

D O I：

10.1016/S1003-6326(20)65310-9

中图分类号：

学科分类号：

摘要：

To solve the problem of difficult machining, the near-net shaped Al/SiCP composites with high volume fraction of SiC particles were fabricated by vacuum-pressure infiltration. The SiCP preform with a complex shape was prepared by gelcasting. Pure Al, Al4Mg, and Al4Mg2Si were used as the matrices, respectively. The results indicate that the optimal parameters of SiCP suspension in gelcasting process are pH value of 10, TMAH content of 0.5 wt.%, and solid loading of 52 vol.%. The Al matrix alloyed with Mg contributes to improving the interfacial wettability of the matrix and SiC particles, which increases the relative density of the composite. The Al matrix alloyed with Si is beneficial to inhibiting the formation of the detrimental Al4C3 phases. The Al4Mg2Si/SiCP composite exhibits high relative density of 99.2%, good thermal conductivity of 150 W·m−1·K−1, low coefficient of thermal expansion of 10.1×10−6 K−1, and excellent bending strength of 489 MPa. © 2020 The Nonferrous Metals Society of China

引用

页码：1452 / 1462

页数：10

共 24 条

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