【摘要】 本研究采用轻质氧化镁粉末（纯度≥98.5%）作为主要原料，同时以氧化锆（ZrO₂）、氧化镨(Pr₆O₁₁)和氧化铈（CeO₂）作为添加剂，聚乙烯醇（≥98.0%）作为粘结剂（添加量为10%，质量分数），通过干压成型后，在常压下进行烧结，从而制备得到氧化镁陶瓷材料。烧结温度1550℃，保温1 h～2 h成型后对氧化镁陶瓷进行密度、体积收缩率、硬度、抗热震、显微结构及物相检测及分析。固定ZrO₂添加量为1%后分别先后添加Pr₆O₁₁和CeO₂，探究获得Pr₆O₁₁和CeO₂的最佳添加量分别为0.5%和5%。然后探究Pr,Ce共掺杂不同添加含量对氧化镁陶瓷材料烧结及抗热震性能的影响。结果表明:共掺杂CeO₂与Pr₆O₁₁的添加比例为3.0∶0.5（质量分数）时氧化镁陶瓷具有最佳的洛氏硬度为86 HRB，此时的抗热震次数为11次。更多还原

【Abstract】 In this study,the magnesia ceramics were fabricated by atmospheric pressure sintering following dry pressing,which was using light magnesium oxide purity ≥98. 5% powder as primary raw material,the ZrO₂,CeO₂ and Pr₆O₁₁ as additive and polyvinyl alcohol as binding agent（10%,the same below）. The sintering properties,hardness,thermal shock resistance,microstructure and phase of MgO were investigated at 1550 ℃,with a holding time of 1 to 2 hours. After the addition amount of ZrO₂ was fixed at 1%,Pr₆O₁₁ and CeO₂ were sequentially introduced to investigate the optimal doping levels of Pr₆O₁₁ and CeO₂,which were determined to be 0.5% and 5%,respectively. Subsequently,the effects of varying Pr and Ce co-doping contents on the sintering behavior and thermal shock resistance of magnesium oxide ceramic materials were examined. Co-doped MgO ceramics exhibit the highest Rockwell hardness of 86 HRB when the CeO₂ to Pr₆O₁₁ addition ratio（by mass fraction） is 3. 0∶0. 5,with a corresponding thermal shock resistance of 11 cycles.更多还原