激光合金化Si_3N_4/石墨复合涂层及其摩擦学性能研究  

Study on Si_3N_4/graphite Composite Coating by Laser Alloying and Their Tribological Performance

作　　者：王黎钦[1] 应丽霞 古乐[1] 张三川[2] 李秀娟[1] 齐毓霖[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001 [2]郑州大学机械工程学院,郑州450052

出　　处：《应用激光》2003年第2期77-80,共4页Applied Laser

摘　　要：在 4 5钢表面激光合金化Si3 N4/石墨复合涂层 ,对合金化层的微观组织结构、显微硬度、元素含量和分布、摩擦磨损性能等进行了分析和实验研究 ,并据此对预涂层材料组成、配比和激光合金化工艺参数进行了优化。结果表明 :激光合金化Si3 N4/石墨复合材料能够获得组织均匀细密、硬度显著提高的合金化层。并且在干摩擦条件下 ,减小了金属表面的摩擦系数 ,提高了耐磨性和抗粘着的能力 。Study on laser alloying of Si 3N 4/graphite composite coating on 45carbon steel has been carried out in this paper. The microstructure, micro-hardness, contents and distributions of elements and tribological performance of coatings have been analyzed and studied. Based on these analyses, the ingredients and proportion of powders in pre-coatings and parameters of laser alloying are optimized. The results show that laser alloying of Si 3N 4/ graphite can attain high quality coating with uniform microstructure and increased hardness. And the alloyed coatings have lower friction coefficient, higher wear resistance, stronger anti-cohesion and steady tribological process under dry friction condition.

关 键 词：45钢 激光合金化 氮化硅/石墨 摩擦学 微观组织 自润滑复合涂层 Si3N4/石墨复合涂层 

分 类 号：TG162[金属学及工艺—热处理]