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Nanostructured Bulk Polycrystal LaB6 Cathode Prepared by in-Situ Spark Plasma Sintering
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    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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[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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  • Received:January 24,2008
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