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以Ni-W-Si合金为原料,利用激光合金化技术在AISI 304不锈钢表面上制备了以W_5Si_3的复合相为增强相的Ni-W-Si涂层,用SEM、XRD与EDS等方法分析了合金的显微组织、相组成及成分,讨论了不同W、Si含量对涂层组织和耐磨性能的影响。结果表明,涂层中析出了大量花瓣状或胞状W_5Si_3、CrSi_2及(Fe,Ni)复合相,对提高涂层抗磨损能力有良好的增强作用;含W量较高的粉末经激光合金化后残余大量未熔W颗粒,新相以其为形核中心析出并长大形成夹心结构;涂层磨损机制主要为磨粒磨损,高强韧的W_5Si_3相使涂层的显微硬度显著提高(最高达10400 MPa),并使室温干滑动摩擦磨损抗性提高了3~8倍。
Using Ni-W-Si alloy as raw material, Ni-W-Si coating with W_5Si_3 composite phase as reinforcing phase was prepared on the surface of AISI 304 stainless steel by laser alloying. The microstructure of the coating was analyzed by SEM, XRD and EDS Alloy microstructure, phase composition and composition, discussed the different W, Si content of the coating on the organization and wear resistance. The results show that a large number of petaloid or cellular composite phases of W_5Si_3, CrSi_2 and (Fe, Ni) are precipitated in the coating, which can improve the anti-wear ability of the coatings. After laser alloying, A large number of unmelted W particles remain, and the new phase precipitates and grows to form a sandwich structure as its nucleation center. The wear mechanism of the coating is mainly abrasive wear, and the high-toughness W_5Si_3 phase significantly increases the microhardness of the coating 10400 MPa), and room temperature sliding friction and wear resistance increased by 3 to 8 times.