摘要
采用超重力场反应熔铸技术,以（Ti＋B_4C）为主体系,辅以（Cr O_3＋WO_3＋Ni O＋Al）复杂铝热体系,制备出（Ti,W,Cr）B_2-（Ti,W,Cr）C陶瓷刀具材料。XRD、FESEM与EDS分析表明：（Ti,W,Cr）B_2-（Ti,W,Cr）C陶瓷基体主要由（Ti,W,Cr）B_2块晶、不规则（Ti,W,Cr）C、Al Ni及少量Al_2O_3构成。燃烧体系反应完成后,Al_2O_3熔滴被分离,得到Ti-W-Cr-Ni-C-B混合熔体。在混合熔体的冷却凝固过程中,Ti C优先形核析出,[W]、[Cr]原子取代部分[Ti],扩散至Ti C相中,先后生成（Ti,W）C、（Ti,W,Cr）C;在Ti B_2长大过程,[W]、[Cr]原子取代部分[Ti],生成（Ti,W,Cr）B_2;在凝固后期,[Ni]与少量未反应的[Al]反应生成Al Ni,分布于基体间,提高了陶瓷的致密性。
（Ti, W, Cr）B2- （Ti, W, Cr）C ceramic cutting tool materials were prepared by reactive melt-casting in high-gravityfield technology using （Ti＋B4C） as primary system assisted by （CrO3＋WO3＋NiO＋A1） complex thermit. XRD, FESEM andEDS results show that the ceramics are composed of （Ti, W, Cr）B2 block-like crystals, irregular （Ti, W, Cr）C grains, AINialloy phase and trace amount of A1203. Ti-W-Cr-Ni-C-B mixed melt can be obtained following by the separation of A1203molten drops after the completion of combustion reaction. In the solidifcation process of Ti-W-Cr-Ni-C-B mixed melt, TiCtakes lead in nucleating, [W] and [Cr] atoms substitute partial [Ti] atoms and diffuse into TiC crystals, and （Ti, W）C and （Ti,W, Cr）C solids appear successively. （Ti, W, Cr）B2 solids precipitate subsequently due to the substitution of partial [Ti] for [W]and [Cr] atoms in the growth of TiB2 crystals. Finally, the reaction of [Ni] and few unreacted [AI] atoms forms AINi, whichdistributes in the ceramic matrix and enhances the densification of ceramics.
作者
潘传增
尹玉军
张靖
PAN Chuanzeng, YIN Yujun, ZHANG Jing(Ordnance Engineering College, Shijiazhuang 050003, Chin)
出处
《热加工工艺》
CSCD
北大核心
2018年第4期122-125,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51202293)
