Microstructure and dry sliding wear resistance of Moss-toughened Mo2N3Si metal silicide alloys

被引：11
作者：
Gui, Y. L. [1 ]
Wang, H. M. [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Lab Laser Mat Proc & Mfg, Beijing 100083, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2007年 / 25卷 / 5-6期
基金：
中国国家自然科学基金;
关键词：
intermetallics; laser melting deposition; toughening; refractory metal silicide; wear;
D O I：
10.1016/j.ijrmhm.2006.11.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A wear resistant Mo2Ni3Si-based metal silicide alloy toughened by molybdenum-based solid solution (Me-ss) was fabricated by the laser melting deposition (LMD) manufacturing process. Microstructure of the alloy is composed of Mo-ss primary dendrites and the matrix of the single phase Mo2Ni3Si. Wear resistance and friction coefficient of the alloys were evaluated under metallic dry sliding wear test conditions as a function of contact load. Results showed that the alloys have a low friction coefficient and outstanding wear resistance due to the high hardness of Mo2Ni3Si matrix and the high strength, ductility and toughness of Mo-ss dendrites. The wear rate and the friction coefficient of alloys are extremely insensitive to the contact load owing to the abnormal hardness-temperature relation of Mo2Ni3Si.The Mo-ss dendrite played the role of trapping micro-cracks and restraining brittle spalling of the Mo2Ni3Si matrix during wear process and improved the wear properties of Mo-ss-toughened Mo2Ni3Si alloy. (C) 2006 Elsevier Ltd. All rights reserved.
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收藏
页码：433 / 439
页数：7
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