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| 含板状晶WC双模组织结构硬质合金的研究 | |
| 引用本文： | 张立,陈述,张传福,黄伯云. 含板状晶WC双模组织结构硬质合金的研究[J]. 稀有金属, 2004, 28(6): 979-982 |
| 作者姓名： | 张立 陈述 张传福 黄伯云 |
| 作者单位： | 1. 中南大学粉末冶金国家重点实验室,湖南,长沙,410083 2. 长沙矿冶研究院分析检测中心,湖南,长沙,410012 3. 中南大学冶金科学与工程学院,湖南,长沙,410083 |
| 基金项目： | 国家自然科学基金专项基金项目 (50 32 30 0 8)，湖南省自然科学基金项目 (0 4JJ30 84)，国家留学基金委资助项目 [留金出(2 0 0 1 ) 30 4 8号 ] |
| 摘 要： | 采用超细WC原料，在WC-20Co合金中加入纳米Y2O3，在1440℃的液相烧结温度下获得了含板状晶WC双模组织结构的合金。通过对比低于共晶温度下热压固结工艺与传统液相烧结工艺制备的WC-20Co=1Y2O3硬质合金的组织结构发现，液相烧结合金中WC板状晶是在液相烧结阶段通过液相重结晶形成的，均匀分散在合金中的Y2O3具有促进WC从粘结相中均匀析出长大、抑制WC沿C轴方向生长的作用，因而使合金中粗大的WC呈现板状晶的形貌。研究结果表明，板状晶强化的双模结构WC-20Co—1Y2O3合金具有较好的综合性能。 |
| 关 键 词： | 硬质合金 板状晶WC 双模结构 稀土 热压 液相烧结 |
| 文章编号： | 0258-7076(2004)06-0979-04 |
Cemented Carbide with WC Platelet-Enhanced Bi-Model Structure |
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| Zhang Li ,Chen Shu,Zhang Chuanfu,Huang Baiyun. Cemented Carbide with WC Platelet-Enhanced Bi-Model Structure[J]. Chinese Journal of Rare Metals, 2004, 28(6): 979-982 | |
| Authors: | Zhang Li Chen Shu Zhang Chuanfu Huang Baiyun |
| Affiliation: | Zhang Li 1*,Chen Shu2,Zhang Chuanfu3,Huang Baiyun1 |
| Abstract: | Platelet-enhanced bi-model structure was observed in high temperature liquid phase sintered WC-20Co-1Y_2O_3 cemented carbide with ultrafine tungsten carbide and nano yttrium oxide as raw materials. By comparing the microstructures of WC-20Co-1Y_2O_3 cemented carbides by hot-press at the temperature below the eutectic melting temperature and conventional liquid phase sintering, it is shown that the plate-like WC grain is formed through the mechanism of dissolution/reprecipitation process (recrystallization) at the stage of liquid phase sintering. Yttrium oxide homogeneously distributes in the alloy facilitates the uniform growth of tungsten carbide and can play the role of restraining the growth of tungsten carbide along the direction of c axis. With a result, the coarse WC grains formed at the stage of liquid phase sintering take the shape of platelet. It is shown that platelet-enhanced bi-model structured WC-20Co-1Y_2O_3 cemented carbide can be characterized by good combination of hardness and toughness. |
| Keywords: | cemented carbide plate-like WC grain bi-model structure rare earth hot-press consolidation liquid phase sintering |
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