【摘要】 研究了以Y2 O3 和Y2 O3 +La2 O3 为烧结助剂的Sialon陶瓷的常压烧结过程及其相结构。结果表明 :添加 6 %Y2 O3 在 175 0℃常压烧结 1h可获得相对密度大于 99%的Sialon陶瓷 ;La2 O3 可部分或大部分取代Y2 O3 ,混合烧结助剂的最佳烧结温度 (180 0℃ )略高于单纯以Y2 O3 为烧结助剂的最佳烧结温度 (175 0℃ )。加入La抑制了α′相和YAG相的生成 ,选择合适的工艺条件 ,可制得α′+β′复相陶瓷。探讨了用Sol Gel化学法混料代替机械法混料的可能性 ,由于γ Al2 O3 转变成α Al2 O3 等原因 ,化学混料法的效果不如机械法。更多还原

【Abstract】 The pressureless sintering process adding Y 2O 3 and Y 2O 3+La 2O 3 as sintering aids was studied. It was found that a Sialon ceramic adding 6% Y 2O 3 as sintering aid was sintered to over 99% TD when sintered at 1750℃ for 1h. Y 2O 3 can partially be replaced by La 2O 3, and the best sintering temperature of Y La Sialon is a little higher than that of Y Sialon. The phase structure studies of Y La Sialon showed that La can restrain the growth of α ′ and YAG phase in Sialon. The effect of chemical mixing is not as good as that of mechanical mixing because of transformation of γ Al 2O 3 to α Al 2O 3 in the sintering process and other factors. [更多还原