SiC_p/Al-Si合金梯度材料的磨损特性

Wear Behavior of SiC_p/Al-Si Alloy Functionally Gradient Material

采用离心铸造技术制备了 Si Cp/ Al- 8.8% Si合金梯度材料 ,并用扫描电子显微镜、HV- 5型小负荷维氏硬度计和ML- 10 0型销 -盘磨粒磨损试验机等设备研究了该梯度材料组织、硬度及耐磨性的梯度分布规律 .结果表明 :因 Si C颗粒的密度比铝合金液的大 ,其在离心力场中偏聚于试样的外侧 ,含量由外向内逐渐降低直至消失 ,呈梯度变化 ;Si Cp/Al- 8.8% Si合金梯度材料的硬度由外向内逐渐降低 ,呈梯度变化 ,与 Si C颗粒的分布规律一致 ;Si Cp/ Al- 8.8% Si合金梯度材料的耐磨性能取决于 Si C颗粒的数量及其分布 ,耐磨性能由外向内逐渐变差 ,呈梯度变化 。

SiC p /Al 8.8%Si alloy functionally gradient materials (FGM) were made by centrifugal casting method. The gradient distribution law of structure, hardness and wear resistance of the FGM were investigated by means of scanning electrom microscope (SEM), HV 5 model small load Vickers micro hardness tester, and ML 100 model pin on disk abrasive wear test rig. The results show that SiC particles segregated to the specimen edge in centrifugal field because the density of SiC particles is bigger than that of Al alloy melt. The content of SiC particles decreases gradually until disappears from the edge to the core of the specimen, and experiences gradient change. The hardness of SiC p /Al 8.8%Si alloy FGM decreases gradually from the edge to the core of the specimens and experiences gradient change as well, which agrees well with the distribution law of SiC particles in the specimen. The wear resistance of SiC p /Al 8.8%Si alloy FGM, which depends on the distribution and content of SiC particle, reduces from the edge to the core of the specimens and undertakes gradient change, agreeing with the distribution law of hardness.