放电等离子烧结原位制备LaB_6多晶纳米块体阴极材料  

Nanostructured Bulk Polycrystal LaB_6 Cathode Prepared by in-Situ Spark Plasma Sintering

作　　者：周身林[1] 刘丹敏[1] 张久兴[1] 金帅[1] 

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100022

出　　处：《稀有金属材料与工程》2009年第2期313-317,共5页Rare Metal Materials and Engineering

基　　金：教育部创新工程重大项目培育资金项目(705004)

摘　　要：用氢直流电弧法制备La-LaH2纳米粉末,再采用放电等离子烧结技术,在原位、"无氧"条件下成功制备高纯LaB6多晶纳米块体热阴极材料,并系统研究放电等离子烧结温度、压强对材料物相、结构和性能的影响。结果表明,材料中形成单相的LaB6,纯度达到99.867%,平均晶粒尺寸为120nm,LaB6纳米块体相对密度达到99.2%,维氏硬度达到17.4GPa,抗弯强度高达245.6MPa,已达单晶材料的理论抗弯强度值。In order to obtain LaBs 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 LaBs polycrystal nano-bulk cathode by in situ SPS （Spark Plasma Sintering） in a oxygen free system. The effects of sintering temperature and pres＇sure on the phases, microstructure and properties of the nano-bulk were systematically studied. The results show that the single-phase LaBs 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 LaBs is up to 99.2%, and its hardness is up to 17.4 GPa, the bend strength of the polycrystal LaBs is as high as around 245.6 MPa, the theoretical bend strength value of single crystal.

关 键 词：放电等离子烧结 多晶LaB6 纳米块体 热阴极 

分 类 号：TB383.1[一般工业技术—材料科学与工程]