NiAl－2.5Ta－7.5Cr－1B合金的微观组织、力学性能与摩擦磨损特性

王振生; 张孟恩; 杨双双; 郭建亭; 周兰章; 陈志钢

doi:10.3724/SP.J.1037.2013.00452

金属学报 >

2013 , Vol. 49 >Issue 11: 1325 - 1332

DOI: https://doi.org/10.3724/SP.J.1037.2013.00452

论文

NiAl－2.5Ta－7.5Cr－1B合金的微观组织、力学性能与摩擦磨损特性

王振生 ,
张孟恩 ,
杨双双 ,
郭建亭 ,
周兰章 ,
陈志钢

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1) 湖南科技大学先进矿山装备教育部工程研究中心, 湘潭 411201
2) 湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室, 湘潭 411201
3) 中国科学院金属研究所, 沈阳 110016

王振生, 男, 1978年生, 副教授, 博士

收稿日期: 2013-07-27

修回日期: 2013-08-28

网络出版日期: 2013-11-11

基金资助

国家自然科学基金项目51101055和湖南省自然科学基金项目13JJ8015资助

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MICROSTRUCTURE, MECHANICAL, FRICTION AND WEAR PROPERTIES OF NiAl－2.5Ta－7.5Cr－1B ALLOY

WANG Zhensheng ,
ZHANG Meng'en ,
YANG Shuangshuang ,
GUO Jianting ,
ZHOU Lanzhang ,
CHEN Zhigang

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1) Engineering Research Center of Advanced Mining Equipment, Ministry of Education,Hunan University of Science and Technology, Xiangtan 411201
2) High Temperature Wear Resistance Materials and Preparation Technology of Hunan Province,the National Defense Science and Technology Key Laboratory, Hunan University of Science and Technology, Xiangtan 411201
3) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2013-07-27

Revised date: 2013-08-28

Online published: 2013-11-11

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摘要

采用SEM和XRD分析了NiAl－2.5Ta－7.5Cr－1B合金的微观组织,采用万能力学试验机测试了合金的力学性能,采用高温摩擦磨损机研究了合金室温－-600℃的摩擦磨损特性. 研究表明,NiAl－2.5Ta－7.5Cr－1B合金由NiAl相、NiAl－Cr共晶、Cr₂Ta相、(Ta, Cr)₃B₂相和TaB相组成.B元素的添加使NiAl－2.5Ta－7.5Cr合金的塑性提高了50%. 从室温－600℃时,NiAl－2.5Ta－7.5Cr－1B合金表现出良好的自润滑耐磨损特性,其自润滑耐磨损特性来源于合金磨损表面存在固体Al₄B₂O₉颗粒和液态B₂O₃,液态B₂O₃使摩擦磨损符合流体动压润滑机制,Al₄B₂O₉颗粒起到支撑作用.

关键词： NiAl－2.5Ta－7.5Cr－1B合金; 微观组织; 力学性能; 摩擦磨损特性

本文引用格式

王振生 , 张孟恩 , 杨双双 , 郭建亭 , 周兰章 , 陈志钢 . NiAl－2.5Ta－7.5Cr－1B合金的微观组织、力学性能与摩擦磨损特性[J]. 金属学报, 2013 , 49(11) : 1325 -1332 . DOI: 10.3724/SP.J.1037.2013.00452

Abstract

The microstructure and properties of NiAl－2.5Ta－7.5Cr－1B alloy are investigated in this work. The microstructure is analyzed by SEM and XRD, the mechanical properties are conducted by a universal mechanical testing machine and the friction and wear features from room temperature to 600℃ are mainly studied using an elevated temperature friction and wear machine. The experimental results show that the NiAl－2.5Ta－7.5Cr－1B alloy consists of NiAl, eutectic (NiAl－Cr), Cr₂Ta, (Ta, Cr)₃B₂ and TaB. The addition of B into the NiAl－2.5Ta－7.5Cr alloy improves the plasticity by 50%. The NiAl－2.5Ta－7.5Cr－1B alloy exhibits excellent self－lubricating and wear－resistant properties from room temperature to 600℃ which could be mainly attributed to the co－existence of B₂O₃ liquid phase and Al₄B₂O₉ solid particles on the worn surface. The B₂O₃ liquid phase makes the friction and wear process conform to the mechanism of hydrodynamic lubrication and the Al₄B₂O₉ solid particles have a load－bearing function.

Key words： NiAl－2.5Ta－7.5Cr－1B alloy; microstructure; mechanical property; friction and wear property

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