Microwave synthesis and properties of fine-grained oxides dispersion strengthened tungsten
Microwave synthesis and properties of fine-grained oxides dispersion strengthened tungsten
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DOI：
10.1016/j.jnucmat.2012.03.008
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发表时间：
2012-05
影响因子：
3.1
通讯作者：
R. Liu;Yue Zhou;T. Hao;T. Zhang;Xuejiang Wang;C. S. Liu;Fang Qianfeng
中科院分区：
文献类型：
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作者：
R. Liu;Yue Zhou;T. Hao;T. Zhang;Xuejiang Wang;C. S. Liu;Fang Qianfeng
采用微波烧结法制备了致密的W、W-1wt%La2O3和W-1wt%Y2O3样品。利用场发射扫描电镜（FESEM）和透射电镜（TEM）分析、热导率和维氏显微硬度测试对样品进行了表征。结果表明，Y2 O3和La 2 O3纳米颗粒的加入能显著抑制W在凝固过程中的晶粒长大，使W-1%Y2O3试样的平均晶粒尺寸从纯W的3.2μm减小到0.7μm。这些样品的热导率和相对密度分别大于120 W/mK和95- 97%。W-1%Y2O3样品的维氏硬度高达6.91GPa，比纯W的维氏硬度（5.04GPa）提高了30%。
Dense W, W–1wt%La2O3and W–1wt%Y2O3samples with fine microstructure were fabricated by microwave sintering method using nano-scaled powders. The FESEM and TEM analysis, thermal conductivity and Vickers micro-hardness measurements were exploited to characterize these samples. It is found that the addition of Y2O3and La2O3nano-particles could significantly hinder the grain growth of tungsten in the consolidation process, decreasing the average grain size from 3.2μm in pure W down to 0.7μm in W–1%Y2O3sample. The thermal conductivity and relative density of these samples are higher than 120W/mK and in the range of 95–97%, respectively. The Vickers hardness of W–1%Y2O3sample reaches as high as 6.91GPa, 30% higher than that of pure W (5.04GPa).