激光合金化Si3N4/石墨复合涂层及其摩擦学性能研究

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 ,整个摩擦过程也很稳定

Study on Si3N4/graphite Composite Coating by Laser Alloying and Their Tribological Performance

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.