(南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 210016)
摘 要: 以Mo、Fe、FeB和Mn等為原料，采用反應(yīng)燒結(jié)法制備Mo2FeB2基金屬陶瓷。利用SEM、EDS和XRD等技術(shù)對金屬陶瓷顯微組織、物相和微區(qū)合金元素進行分析，并采用固體與分子經(jīng)驗電子理論研究Mn對脆性第三相以及粘接相對硬質(zhì)相潤濕性的影響。結(jié)果表明：添加少量Mn使第三相各鍵的共價電子對數(shù)nα均得到提高，從而改善其脆性；同時Mn也降低液相形成溫度，提高粘結(jié)相對硬質(zhì)相的潤濕性。因此，Mo2FeB2基金屬陶瓷具有較好的力學(xué)性能。
關(guān)鍵字: Mo2FeB2基金屬陶瓷；力學(xué)性能；潤濕性
Mo2FeB2-based cermets
（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
