| La2O3掺杂纳米W粉致密化行为与性能 |
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| 引用本文： | 陈铮,杨军军,章林,曲选辉,秦明礼.La2O3掺杂纳米W粉致密化行为与性能[J].粉末冶金技术,2021,39(5):387-393. |
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| 作者姓名： | 陈铮 杨军军 章林 曲选辉 秦明礼 |
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| 作者单位： | 1.西安理工大学材料科学与工程学院，西安 710048 |
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| 基金项目： | 国家自然科学基金资助项目（51574031）；国家重点研发计划资助项目（2017YFB0306000，2017YFB0305600） |
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| 摘 要： | 采用溶液燃烧合成法制备了La2O3掺杂纳米钨（W）粉，分析了La2O3掺杂纳米W粉的致密化行为及La2O3对纳米W粉致密化行为的影响，研究了烧结后合金的显微组织形貌、导热性能及显微硬度。结果表明，La2O3会显著抑制纳米W粉的致密化速度，纯W粉在1350 ℃烧结后的相对密度可达到96.2%，而La2O3掺杂纳米W粉在1500 ℃烧结后的相对密度仅为95.0%。在1500 ℃烧结后的La2O3掺杂W合金的晶粒尺寸为0.57 μm，比纯W粉烧结合金的晶粒尺寸小一个数量级，因此其导热性能也较纯W粉烧结合金有所降低，但是显微硬度得到显著提升。
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| 关 键 词： | 纳米钨粉 La2O3掺杂 致密化 动力学 导热率 |
| 收稿时间： | 2021-03-01 |
Densification behavior and performance of La2O3-doped W nanopowders |
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| Affiliation: | 1.School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China2.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The La2O3-doped W nanopowders were prepared by the solution combustion synthesis method. The densification behavior of the La2O3-doped W nanopowders and the effect of La2O3 on the densification of the W nanopowders were analysed. Meanwhile, the microstructure, thermal conductivity, and microhardness of the sintered alloys were also studied. The results show that, La2O3 can significantly inhibit the densification rate of W nanopowders. The relative density of the pure W powders sintered at 1350 ℃ can reach 96.2%, while that of the La2O3-doped W nanopowders sintered at 1500 ℃ is only 95.0%. The grain size of the La2O3-doped W alloys sintered at 1500 ℃ is 0.57 μm, which is one order of magnitude smaller than that of the pure W alloys. Therefore, the thermal conductivity of the La2O3-doped W alloys is lower than that of the pure W alloys, but the microhardness is significantly improved. |
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