WC-Co硬质合金中TaC,Cr_3C_2添加剂的作用机理  

Mechanism of the Effects of TaC and Cr3C2 on Property of WC-Co Cemented Carbides

作　　者：刘寿荣[1] 

机构地区：[1]天津硬质合金研究所

出　　处：《稀有金属材料与工程》1997年第6期31-35,共5页Rare Metal Materials and Engineering

摘　　要：研究了添加ＴａＣ、Ｃｒ３Ｃ２对ＷＣ－１０Ｃｏ合金组织结构和性能的影响及相关机理。结果表明，添加少量ＴａＣ（ｗ＝２％）、Ｃｒ３Ｃ２（ｗ＝０４４％）可导致ＷＣ－１０Ｃｏ合金的ＷＣ晶粒明显细化、ＷＣ邻接度下降、γ相平均自由程减小，但强韧性有所下降；Ｃｒ３Ｃ２助长ＷＣ－１０Ｃｏ合金ＷＣ晶粒断续长大；ＴａＣ－ＷＣ固溶体耐碱蚀性差；合金断口中沿ＷＣ－ＷＣ晶界脆断比例增加，ＴａＣ－ＷＣ固溶体晶粒倾向于穿晶劈裂。工艺中控制ＴａＣ、Ｃｒ３Ｃ２添加量、确保ＷＣ－Ｃｒ３Ｃ２粉碳化完善以及同时添加ＴａＣ。The effects of TaC and Cr3C2 on the properties and microstructures of WC-Co alloys are explored It is shown that small additions of TaC (2wt%) and Cr3C2 (044wt%) to the alloy can result in a refinement of the WC grain size, lowering of the WC-WC contiguity and the mean free path of the γ-phase, but a decrease of the strength-toughness; Cr3C2can enhance the discontinuous growth of the WC grain size in the WC-Co alloy; the TaC-WC solid solution is less alkali-proof; the brittle fracture of WC-WC boundaries increases and TaC-WC grains tend to cleavage fracture Controlling the additive amount of TaC and Cr3C2 and ensuring perfect carburization of WC-Cr3C2 as well as adding simultaneously TaC and Cr3C2 in production are of great importance to improving the properties of WC-Co alloys

关 键 词：硬质合金 钴 碳化钨 碳化钽 碳化铬 

分 类 号：TG135.5[一般工业技术—材料科学与工程]