Microstructure and dry sliding wear properties of laser clad Mo2Ni3Si/NiSi metal silicide composite coatings

被引：36

作者：

Lu, XD ^{[1
]}

Wang, HM ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Lab Laser Mat Proc & Surface Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2003年 / 359卷

基金：

中国国家自然科学基金;

关键词：

transition metal silicides; composite coatings; wear; laser cladding; microstructure;

D O I：

10.1016/S0925-8388(03)00192-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

Mo2Ni3Si/NiSi wear-resistant metal silicide matrix composite coatings were fabricated on a substrate of an austenitic stainless steel 1Cr18Ni9Ti by laser cladding using Ni-Mo-Si elemental powder blends. The laser clad Mo2Ni3Si/NiSi composite coatings have a fine microstructure consisting of Mo2Ni3Si primary dendrites and the interdendritic Mo2Ni3Si/NiSi eutectics. Wear resistance of the laser clad coatings is evaluated under dry sliding wear test conditions. Influences of wear testing parameters on the wear resistance of laser clad coatings were studied and the wear mechanisms were discussed based on observations of worn surface morphology and subsurface microstructure. Results showed that laser clad Mo2Ni3Si/NiSi metal silicide composite coatings have excellent dry sliding wear resistance and low friction coefficient. Increasing test load has little influence on the wear mass loss of laser clad Mo2Ni3Si/NiSi metal silicide composite coatings. (C) 2003 Elsevier B.V. All rights reserved.

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页码：287 / 291

页数：5

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