Microstructure and Properties of SiC/Al-Mg Composites Based on 3D-printed Preforms

Wang Qiong; Liu Hongjun

doi:10.15980/j.tzzz.2022.05.019

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Microstructure and Properties of SiC/Al-Mg Composites Based on 3D-printed Preforms
Vol. 42, Issue 5, Pages: 614-620(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.05.019

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Wang Qiong, Liu Hongjun. Microstructure and Properties of SiC/Al-Mg Composites Based on 3D-printed Preforms. [J]. Special Casting & Nonferrous Alloys 42(5):614-620(2022)
DOI：

Wang Qiong, Liu Hongjun. Microstructure and Properties of SiC/Al-Mg Composites Based on 3D-printed Preforms. [J]. Special Casting & Nonferrous Alloys 42(5):614-620(2022) DOI： 10.15980/j.tzzz.2022.05.019.

摘要

以3D打印网络结构SiC预制体结合Al-Mg合金的熔体浸渗工艺，制备出互穿网络结构SiC/Al-Mg复合材料，表征了复合材料的微观组织、力学性能和摩擦性能，分析了浸渗温度的影响。结果表明，在910～950℃

铝合金能完全浸渗3D打印的层级网络结构SiC

复合材料微观组织由互穿的铝合金和“壳-芯”结构网络框架构成。提高浸渗温度促进了反应发生和组织均匀，浸渗温度为930℃时，SiC/Al-Mg复合材料综合性能最佳，抗压强度和硬度（HV）达到425 MPa和557

磨损率为3.37×10

-7

/（N·m）。

Abstract

The interpenetrating network SiC/Al-Mg composites were prepared by 3 D-printed network SiC preform combined with the melt infiltration process of Al-Mg alloy. The microstructure

mechanical properties and friction properties of the composites were characterized

and the effects of infiltration temperature was analyzed. The results indicate that Al alloy can fully permeate SiC with 3 D printed hierarchical network structure from 910 ℃ to 950 ℃

and the microstructure of composite is composed of interpenetrating Al alloy and “shell-core” network frame. The increase of infiltration temperature promotes the reaction and the uniformity of microstructure. When the temperature is 930 ℃

the SiC/Al-Mg composite has the optimal comprehensive properties

where compressive strength and hardness of the composites reach 425 MPa and 557 HV

respectively

and the wear rate is 3.37×10

-7

cm~3/（N·m）.