WC-8Co硬质合金中稀土添加剂的作用  

Mechanism of Rare Earth Additive on Cemented Carbides

作　　者：刘寿荣[1] 梁福起[1] 孙景[2] 郝建民[3] 

机构地区：[1]天津硬质合金研究所 [2]天津大学 [3]天津电子材料研究所

出　　处：《中国稀土学报》1998年第1期45-49,共5页Journal of the Chinese Society of Rare Earths

摘　　要：以混合稀土氧化物为添加剂，在真空炉中于０２Ｐａ、１３７０℃下经液相烧结３０ｍｉｎ制备加稀土的ＷＣ８ＣｏＲ硬质合金试样。Ｘ射线衍射、扫描电镜和磁性测定的结果表明，稀土提高ＷＣ８Ｃｏ硬质合金的表面宏观压应力是强化合金的重要因素，其阻止粘结相（γ相）的ｆｃｃ→ｈｃｐ转变对合金强韧性的作用甚微。稀土对ＷＣＣｏ硬质合金显微结构参数无明显影响。The rare-earthbearing WC8CoR cemented carbides samples were made by liquid-phase sintering in vacuum furnace under 02 Pa at 1370 ℃ for 30 min taking mischmetal oxides as the additive. Results of Xray diffraction analysis, scanning electronic microscope determination and magnetism measurement show that raising of the macropressure stress on WC8Co alloy sample surface by the rare earths is the important strengthening factor, the effect of stopping fcc→hcp transformation of γphase on raising the alloy strength by adding rare earths is very little. There are no significant effect of the rare earths on the alloy microstructure parameters and no additional strengthing effect of W solute on γphase.

关 键 词：稀土 WC-CO 硬质合金 强化 添加剂 稀土硬质合金 

分 类 号：TG135.5[一般工业技术—材料科学与工程] TG146.45[金属学及工艺—合金]