| Cr-RE共掺杂WC-Co合金烧结体表面RE_2S_3和RE_2O_2S相的原位形成(英文) |
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| 引用本文： | 张立,冯于平,陈述,吴厚平.Cr-RE共掺杂WC-Co合金烧结体表面RE_2S_3和RE_2O_2S相的原位形成(英文)[J].中国有色金属学会会刊,2014,24(2):401-405. |
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| 作者姓名： | 张立 冯于平 陈述 吴厚平 |
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| 作者单位： | [1] 中南大学 粉末冶金国家重点实验室,长沙410083 [2] 长沙矿冶研究院有限责任公司,长沙,410012 |
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| 基金项目： | Project （51074189） supported by the National Natural Science Foundation of China，Project （2012ZX04003-021） supported by the National Science ＆ Technology Special Foundation of China，Project （Y2012-010） supported by the Nonferrous Metals Research Foundation from Hunan Nonferrous Metals Holding Group Co., Ltd.-CSU, China |
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| 摘 要： | 采用扫描电镜、能谱仪以及X射线衍射仪对具有WC+β(β为钴基粘结相)两相结构的WC-11Co-0.71Cr3C2-0.06RE(RE为含La、Ce、Pr、Nd的混合稀土)硬质合金烧结体表面进行观察与分析。结果表明,在烧结过程中合金中的La、Ce、Pr、Nd通过定向迁移与烧结炉内气氛中的S、O等杂质元素结合,在合金烧结体表面形成RE2S3(主)和RE2O2S(少量)弥散相。从合金中Cr3C2的热力学稳定性、Cr在Co中的溶解度特性以及稀土原子激发等3个方面,对稀土迁移活性的激发机制和稀土原子的定向迁移机制进行分析与讨论。
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| 关 键 词： | RES REO S 硬质合金 烧结 稀土定向迁移 原子极化 |
| 收稿时间： | 11 January 2013 |
In situ formation of RE2S3 and RE2O2S phases on sinter skin of Cr-mischmetal co-doped WC-Co alloy |
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| Li ZHANG,Yu-ping FENG,Shu CHEN,Hou-ping WU.In situ formation of RE2S3 and RE2O2S phases on sinter skin of Cr-mischmetal co-doped WC-Co alloy[J].Transactions of Nonferrous Metals Society of China,2014,24(2):401-405. |
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| Authors: | Li ZHANG Yu-ping FENG Shu CHEN Hou-ping WU |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Changsha Mining and Metallurgy Research Institute Co., Ltd., Changsha 410012, China) |
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| Abstract: | The as-sintered sinter skin of WC-11Co-0.71Cr3C2-0.06RE cemented carbide with WC＋βmicrostructure was analyzed by scanning electron microscope, energy dispersive X-ray spectroscope and X-ray diffractometer. RE represents La-, Ce-, Pr- and Nd-containing mischmetal, andβis cobalt-based binder phase. It was discovered that La, Ce, Pr and Nd migrated directionally from the alloy to the sinter skin to combine with the impurity elements S and O from the sintering atmosphere during the sintering process. As a result, main dispersed phase RE2S3 and minor RE2O2S were formed in situ on the sinter skin. The mechanisms for the stimulation of the migration activity and the directional migration of RE atoms were discussed in terms of the thermodynamics stability of Cr3C2, solubility characteristic of Cr in Co and the polarization or ionization of RE atoms. |
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| Keywords: | RE2O2S RE2O2S cemented carbide sintering rare earth directional migration atom polarization |
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