Microstructure evolution and wear properties of bulk MoSi2 fabricated by field activated sintering

被引：5

作者：

Hu, Qiaodan ^{[1
,2
]}

Luo, Peng ^{[2
]}

Yan, Youwei ^{[3
]}

Li, Jianguo ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Univ Melbourne, Dept Mech Engn, Melbourne, Vic 3010, Australia

[3] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2011年 / 29卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Field activated sintering; Molybdenum disilicide; Microstructure; Wear; TIB2 REINFORCED MOSI2; ABRASIVE WEAR; MO; BEHAVIOR; SI;

D O I：

10.1016/j.ijrmhm.2011.02.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Field activated sintering (FAS) was employed to fabricate dense bulk MoSi2 from Mo and Si powders. During the FAS process, Si was melted first, and then Mo was dissolved leading to a precipitation of MoSi2. A eutectic reaction of MoSi2-Mo5Si3 resulted from a combined effect of Mo-Si exothermic reactions and field induced Joule heating. With hyper-stoichiometric amount of Si (Mo/Si = 1:2.06), the FAS MoSi2 is free of Mo5Si3 phase. Subsequently, an un-lubricated sliding wear test of MoSi2 against carbon steel was conducted. Both normal load and temperature have crucial points related to a transition from mild to severe wear. Sliding speed and relative density have a negative effect on wear rate. In addition, at room temperature the wear is with a protective layer composed of oxide and transferred substance, whereas poor oxidation resistance leads to spalling of the layer and brittle fracture at an elevated temperature up to 500 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：470 / 477

页数：8

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