Phase transformation and tribological properties of Ag-MoO3 contained NiCrAlY based composite coatings fabricated by laser cladding

被引：16
作者：
Wang, Lingqian [1 ]
Zhou, Jiansong [1 ]
Xin, Benbin [1 ,2 ]
Yu, Youjun [1 ]
Ren, Shufang [1 ]
Li, Zhen [1 ]
机构：
[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2017年 / 93卷
基金：
中国国家自然科学基金;
关键词：
Laser cladding; Silver molybdate; Self-lubrication; NiCrAIY-based composite coatings; DEGREES-C; TEMPERATURE; WEAR; FRICTION; BEHAVIOR; SILVER; LUBRICATION; MOLYBDENUM; OXIDATION; OXIDES;
D O I：
10.1016/j.optlastec.2017.02.006
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Ag-MoO3 contained NiCrAIY based composite coating was successfully prepared on GH4169 stainless steel substrate by high energy ball milling and laser cladding. The microstructure and phase transformation were investigated by scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) and X-ray diffraction spectrum (XRD). The tribological behavior and mechanism from room temperature to 800 degrees C were investigated. Results showed that MoO3 in the composite powders transformed to Mo2C reinforcement under the high energy density of laser, and a series of opposite transformation occurred during friction process. The coating showed the lowest friction coefficient and low wear rate at 600 degrees C and 800 degrees C due to the generation of Ag2MoO4 during tribo-chemical reactions and the formation of lubrication glaze on the worn surface. Ag made effective lubrication when the temperature rose up to 200 degrees C. The coating displayed a relatively high friction coefficient (about 0.51) at 400 degrees C, because though MoO3 (oxidation products of Mo2C) and Ag2MoO4 were detected on the worn surface, they could not realize effective lubrication at this temperature. Abrasive wear, adhesive wear and plastic deformation contributed to the increased friction and wear. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：79 / 86
页数：8
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