橡胶模成型和真空烧结制备碳化硼锆合金

B_4C-Zircaloy Prepared by Rubber Isostatic Pressing and Vacuum Sintering

以碳化硼、氢化锆-2粉为原料,用橡胶模成型和真空烧结的方法制备了碳化硼锆合金,用浸渍法测定烧结体的相对密度与开孔率,用扫描电镜分析了烧结体的微观结构,研究了碳化硼含量、成型压力、烧结温度、保温时间、助烧剂加入量对碳化硼锆合金相对密度的影响。结果表明:碳化硼对烧结有阻碍作用,烧结体的相对密度随碳化硼含量的增加而降低;坯体的成型压力越高,烧结温度越高,保温时间越长,烧结体的相对密度越高;锡粉有较好的助烧作用,但锡粉的质量分数不宜超过0.5%,如果添加量过高,烧结体的相对密度反而下降。

B4 C-zircaloy was prepared using Zr-2 hydride powder and B4C powder as raw materials, molded by rubber isostatic pressing, sintered in vacuum furnace. The relative density and open porosity were tested by immersion method. The microstructure was analyzed by scanning electron microscope （SEM）. Influence of B4C content, forming pressure, sintering temperature, sintering time and sintering aide content on relative density and open porosity of the B4 C-zircaloy were investigated. The results show that B4 C hindered the densification of sintered body. With increase of B4 C content, the relative density of the sintered body decreased. 134 C-zircaloy gained a higher density when the forming pressure, sintering temperature and sintering time increased. Sn powder performed sintering aide well for B4C-zircaloy when the content of Sn was below 0. 5wt%, otherwise the relative density of B4 C- zircaloy decreased.