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以稀土氧化物CeO_2为烧结助剂,采用放电等离子(SPS)烧结工艺制备了B_4C基复相陶瓷。研究了CeO_2添加量(质量分数,%)对B_4C基体的致密化和烧结体硬度的影响,并与纯B_4C样品进行对比。借助X射线衍射和扫描电镜分析了复合材料的物相组成和微观结构。结果表明,CeO_2粉体的添加可以显著提高SPS条件下碳化硼的烧结性能。生成相CeB_6填充在B_4C晶粒之间,提高了制品的相对密度。当CeO_2添加量为4%时,在烧结压力35 MPa和1750℃下烧结,样品的相对密度最高(96.7%),其洛氏硬度可达到89.6(HRA)。
B4C-based composite ceramics were prepared by spark plasma sintering (SPS) sintering process using rare earth oxide CeO_2 as sintering aid. The effect of CeO 2 content (mass fraction,%) on the densification of B 4 C matrix and the hardness of sintered body was studied and compared with the pure B 4 C sample. The phase composition and microstructure of the composites were analyzed by X-ray diffraction and scanning electron microscopy. The results show that the addition of CeO_2 powder can significantly improve the sintering properties of boron carbide under SPS conditions. The formation phase CeB_6 filled in B_4C grains, increased the relative density of the product. When the CeO 2 content is 4%, sintered at 35 MPa and 1750 ℃, the highest relative density (96.7%) and the Rockwell hardness can reach 89.6 (HRA).