(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 湖南人文科技學(xué)院 機(jī)電工程系，婁底 417000)
摘 要: 采用XRD、SEM及EPMA等方法研究Fe2B-Mo2FeB2基系列金屬陶瓷的顯微組織與性能。結(jié)果表明：Fe2B-Mo2FeB2基系列金屬陶瓷的相組成均為Fe2B相、Mo2FeB2相、Fe3B相及少量Fe基黏結(jié)相，C及Mo原子分別部分置換Fe3B相中的B及Fe原子是該相能穩(wěn)定存在于室溫的重要原因。隨著Mo含量的增加，金屬陶瓷的硬度略有提高，抗彎強(qiáng)度由371 MPa增至833 MPa，提高452 MPa，增幅達(dá)到121.8%；金屬陶瓷中長棒狀Mo2FeB2相與Fe3B相復(fù)合組織含量增加的同時，F(xiàn)e2B相含量減少是金屬陶瓷獲得優(yōu)異性能的原因。
關(guān)鍵字: Fe2B相；Fe2B-Mo2FeB2基金屬陶瓷；顯微組織；性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Department of Mechanical and Electrical Engineering, Hunan University of Humanities,
Science and Technology, Loudi 417000, China）
Abstract:The microstructures and properties of Fe2B-Mo2FeB2 based cermets were investigated by means of XRD, SEM, EPMA, and so on. The results show that Fe2B-Mo2FeB2 based cermets are composed of Fe2B, Mo2FeB2, Fe3B and a small amount of Fe based binder phase. The main reason why Fe3B, a metastable phase, is stable at room temperature is that some B and Fe atoms in Fe3B are replaced by C and Mo atoms, respectively. With the increase content of Mo, the hardness of cermets increases slightly, the transverse rupture strength is improved from 371 MPa to 833 MPa, the increasing rate is as high as 121.8%, the excellent property of cermets obtained is attributed to the increase of content of composed structure (Mo2FeB2+Fe3B), as well as the decrease of Fe2B phase content.
Key words: Fe2B phase; Fe2B-Mo2FeB2 based cermets; microstructure; property
