Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第9期    总第126期    2009年9月

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文章编号:1004-0609(2009)09-1618-07
Mn对Mo2FeB2基金属陶瓷组织和力学性能的影响
庞旭明,郑  勇,王少刚,王秋红

(南京航空航天大学 材料科学与技术学院,南京 210016)

摘 要: 以Mo、Fe、FeB和Mn等为原料,采用反应烧结法制备Mo2FeB2基金属陶瓷。利用SEM、EDS和XRD等技术对金属陶瓷显微组织、物相和微区合金元素进行分析,并采用固体与分子经验电子理论研究Mn对脆性第三相以及粘接相对硬质相润湿性的影响。结果表明:添加少量Mn使第三相各键的共价电子对数nα均得到提高,从而改善其脆性;同时Mn也降低液相形成温度,提高粘结相对硬质相的润湿性。因此,Mo2FeB2基金属陶瓷具有较好的力学性能。

 

关键字: Mo2FeB2基金属陶瓷;力学性能;润湿性

Effects of Mn on structure and mechanical properties of
Mo2FeB2-based cermets
PANG Xu-ming, ZHENG Yong, WANG Shao-gang, WANG Qiu-hong

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
 Nanjing 210016, China

Abstract:Using Mo, Fe, FeB and Mn powders as raw materials, Mo2FeB2-based cermet was prepared by reaction sintering process. The microstructure was characterized by SEM, EDS and XRD. According to the empirical theory of solid and molecule, the influence of Mn on the third phase and wettability of the formed liquid phase was studied. The results show that the brittleness of third phase is improved by increasing nα values for the covalent bonds with Mn addition. Meanwhile, the wettability of hard phase by binder phase is improved. Consequently, Mo2FeB2-based cermet has higher mechanical properties.

 

Key words: Mo2FeB2-based cermet; mechanical properties; wettability

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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