离心铸造SiCP复合材料筒状零件的组织性能研究
Study on Microstructure and Properties of Cylindrical Parts of SiCP Reinforced Composite Prepared by Centrifugal Casting
邹茂华1,2, 刘昌明1 , 高 鲲1 , 王 开1
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作者单位：(1.重庆大学 材料科学与工程学院， 重庆 400030; 2. 重庆大学 教务处， 重庆 400030)
中文关键字：骤变梯度功能复合材料； SiC颗粒； 离心铸造
英文关键字：leaping-changed functional gradient material; SiC particles; centrifugal casting
中文摘要：选用粒径分别为15、30和59 μm 的SiC颗粒为增强材料，用离心铸造法在766、820 ℃分别浇铸了复合材料筒状零件，检测了热处理前后试样的硬度和耐磨性。在颗粒层中加工出高80 mm、壁厚2.5 mm的薄壁筒状耐磨衬套。结果表明，在零件的宏观组织断面中形成三层：外层在金属基体中包含有SiC颗粒；中间层为金属基体层，基本没有SiC颗粒；内层包含有氧化皮和气泡，在这三层间有两层清晰的界面，呈骤变式变化。热处理可提高复合材料零件的硬度，有颗粒的外层硬度提高程度小于无颗粒的中间层，时效处理降低了复合材料的耐磨性。
英文摘要：The composite materials cylindrical parts reinforced with SiC particles with the diameters of 59 μm, 30 μm, 15 μm were prepared by centrifugal casting process at 766 ℃ and 820 ℃, respectively. The hardness and wear resistance of samples before and after heat treatment were tested. A thin-walled tube-shaped bushing wear with 80 mm high, 2.5 mm wall thickness was manufactured in the grain layer. The results show that, three layers occur in the cross section of the parts, a outer layer contains SiC particles in the matrix of the alloy; a middle layer is the matrix of the alloy without particles and a inner layer contains oxide slag and gas bubbles. There are two clear cut boundaries between the three layers, and there is a clear-cut boundary between the outer layer and the middle layer. Furthermore, it is found that the heat treatment increases the hardness of the composite part. The increasing degree of the hardness of the outer layer with particles is smaller than that of the middle layer without particles. And aging treatment reduces the wear resistance of the composite parts.