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Process and Performance of β-SiCp/Al Prepared by Bottom-Vacuum Pressureless Infiltration
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Process and Performance of β-SiCp/Al Prepared by Bottom-Vacuum Pressureless Infiltration
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National Natural Science Foundation of China (51074123); Science and Technology R&D Projects of Shaanxi Province (2010TG-02); The Research Foundation of Xi’an University of Science and Technology (2012QDJ034 and 201202)

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    摘要:

    采用底部真空無壓浸滲新工藝制備了β-SiCp/Al 復合材料。SiC預制體在1373 K高溫氧化及被熔融鋁浸滲時加入Si、Mg合金元素。通過金相顯微鏡及SEM表征了復合材料的表面和斷口形貌。結果表明，SiC顆粒在基體鋁中分布均勻，SiC預制體浸滲完全。XRD分析表明，復合材料中的主晶相為SiC和Al，存在Mg2Si，MgAl2O4 界面產物，沒有出現(xiàn)Al4C3脆性相。復合材料的力學性能研究表明，復合材料的磨損機制為磨粒磨損和黏著磨損；隨著SiC體積分數(shù)的增加，復合材料的磨損率下降，硬度上升

    Abstract:

    A composite material β-SiCp/Al was fabricated by a novel manufacturing process of bottom-vacuum pressureless infiltration. The β-SiC perform was oxidized at 1373 K and the infiltration in molten Al with the addition of Si and Mg. To evaluate the microstructure and the fractograph of the prepared composites, metallographic and scanning electron microscopes (SEM) were applied. The results reveal that SiC particles can be distributed in the aluminum matrix uniformly, the SiC preform can be completely infiltrated by the molten aluminum. X-ray diffraction (XRD) shows that the main crystalline phases in the composites are β-SiC and Al. There exist Mg2Si, MgAl2O4 interface products, brittle phases such as Al4C3 are not formed within the interface zone. Mechanical properties of the β-SiCp/Al composites were investigated by the wear and friction, Brinell hardness tests. The results prove that the wear mechanisms of the composites are abrasive and adhesive wear. With the increased of SiC volume fraction the wear rate of the composite decreases while the hardness increases

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謝 斌,王曉剛,華小虎,易大偉. Process and Performance of β-SiCp/Al Prepared by Bottom-Vacuum Pressureless Infiltration[J].稀有金屬材料與工程,2014,43(9):2089~2094.[Xie Bin, Wang Xiaogang, Hua Xiaohu, Yi Dawei. Process and Performance of β-SiCp/Al Prepared by Bottom-Vacuum Pressureless Infiltration[J]. Rare Metal Materials and Engineering,2014,43(9):2089~2094.]
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  • 收稿日期:2013-09-18
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  • 在線發(fā)布日期: 2015-02-25
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