放电等离子烧结(SPS)制备DyB6多晶块体材料  

Fabrication polycrystalline DyB_6 bulk by spark plasma sintering

作　　者：魏永峰[1] 张久兴[1] 包黎红[1] 周身林[1] 张宁[1] 

机构地区：[1]北京工业大学材料科学与工程学院,新型功能材料教育部重点实验室,北京100124

出　　处：《功能材料》2011年第11期1969-1971,1976,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50871002)

摘　　要：以微米硼粉和采用氢直流电弧法制备出Dx纳米粉末为原料,利用放电等离子烧结(SPS)技术制备了DyB6多晶块体材料,并分析了烧结温度对样品微观结构及性能的影响。实验结果表明当烧结压力为60MPa,烧结温度为1275℃时,可得到单相DyB6。烧结工艺为1425℃,60MPa所制备样品的密度、维氏硬度和抗弯强度分别为5.191g/cm3、23.32GPa和112.8MPa,当阴极温度为1933K时的发射电流密度为3.6A/cm2。The DyHx nano-powders were prepared by hydrogen arc plasma method,and then the mixed of DyHx nano-powders and micron boron were sintered by spark plasma sintering（SPS） method to fabricate high-properties polycrystalline DyB6 bulk.The influence of SPS sintering temperature on the microstructure and property was investigated.It is shown that the pure phase DyB6 bulk can be easily fabricated by SPS when the sintering temperature is 1275℃.The values of density,Vickers hardness and bend strength respectively reach 5.191g/cm3,23.32GPa and 112.8MPa when the sample was sintered at 1425℃ and 60MPa.Thermionic emission measurement of the sample was performed.The emission current density of the DyB6 is 3.6A/cm2 at 1933K.

关 键 词：放电等离子烧结 多晶DyB6 性能 

分 类 号：TB34[一般工业技术—材料科学与工程]