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.
参考文献
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