(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用粉末冶金熱壓的方法制備Ag-MoS2復合材料，研究銀合金粉末的粒度對復合材料的組織結構、力學性能和摩擦磨損性能的影響。結果表明：隨著銀合金粉末粒度的減小，MoS2團聚體在基體中的分散性得到改善，材料的硬度和抗彎強度同時也得到大幅提高。銀合金粉末較小時，復合材料的穩(wěn)定摩擦因數(shù)較低且較平穩(wěn)；當粉末粒徑大于38 μm時，復合材料的磨損量顯著增大。MoS2團聚體彌散的涂覆在磨損表面上形成了不連續(xù)的潤滑膜，提高MoS2在基體的分散性有利于增加潤滑膜在磨損表面的覆蓋面積，從而減輕表層材料的剪切應力和減少金屬與金屬之間的接觸，降低材料的摩擦與磨損。
關鍵字: Ag-MoS2復合材料；粉末粒度；自潤滑；摩擦；磨損
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The Ag-MoS2 composites were prepared by powder metallurgy method. The effects of the atomized Ag-Cu alloy particle size on the microstructure, mechanical properties and tribological performances of composites were investigated. The results show that the dispersion of MoS2 particle in matrix and the mechanical properties of composites are dramatically improved by reducing the particle size of alloy powder. The composite has a low and stable friction coefficient when the small size alloy particle is used. When the particle size of alloy powder is above 38 μm, the wear loss of the composite increases severely. SEM observation indicates that the worn surface is covered with smeared MoS2 particles and discontinuous lubricating film is formed on it. The area of lubricating film covered on the worn surface increases with increasing the homogeneity of MoS2 in the matrix, and a large area of lubricating film can reduce the magnitude of shear stress transferred to subsurface and prevent the metal-to-metal contact. Therefore, it helps to reduce the friction and wear of composite.
Key words: Ag-MoS2 composite; particle size; self-lubricating; friction; wear
