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放電等離子燒結(jié)原位制備LaB6多晶納米塊體陰極材料
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教育部創(chuàng)新工程重大項(xiàng)目培育資金項(xiàng)目(705004)


Nanostructured Bulk Polycrystal LaB6 Cathode Prepared by in-Situ Spark Plasma Sintering
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    摘要:

    用氫直流電弧法制備La-LaH2納米粉末，再采用放電等離子燒結(jié)技術(shù)，在原位、“無(wú)氧”條件下成功制備高純LaB6多晶納米塊體熱陰極材料，并系統(tǒng)研究放電等離子燒結(jié)溫度、壓強(qiáng)對(duì)材料物相、結(jié)構(gòu)和性能的影響。結(jié)果表明，材料中形成單相的LaB6，純度達(dá)到99.867%，平均晶粒尺寸為120 nm，LaB6納米塊體相對(duì)密度達(dá)到99.2%，維氏硬度達(dá)到17.4 GPa，抗彎強(qiáng)度高達(dá)245.6 MPa, 已達(dá)單晶材料的理論抗彎強(qiáng)度值

    Abstract:

    In order to obtain LaB6 cathode with high-purity and excellent properties，La and LaH2 nanopowders were prepared by hydrogen arc plasma method, and then La-LaH2 and B nanopowders were sintered to fabricate the high-purity LaB6 polycrystal nano-bulk cathode by in situ SPS (Spark Plasma Sintering) in a oxygen free system. The effects of sintering temperature and pressure on the phases, microstructure and properties of the nano-bulk were systematically studied. The results show that the single-phase LaB6 was formed in the nano bulk with a high purity of 99.867％ and an average crystal size of about 120 nm. The relative densities of nano-bulk LaB6 is up to 99.2%, and its hardness is up to 17.4 GPa, the bend strength of the polycrystal LaB6 is as high as around 245.6 MPa, the theoretical bend strength value of single crystal

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周身林,劉丹敏,張久興,金 帥.放電等離子燒結(jié)原位制備LaB6多晶納米塊體陰極材料[J].稀有金屬材料與工程,2009,38(2):313~317.[Zhou Shenlin, Liu Danmin, Zhang Jiuxin, Jin Shuai. Nanostructured Bulk Polycrystal LaB6 Cathode Prepared by in-Situ Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2009,38(2):313~317.]
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  • 收稿日期:2008-01-24
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