(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 研究了以Y2O3和Y2O3+La2O3為燒結助劑的Sialon陶瓷的常壓燒結過程及其相結構 結果表明：添加6%Y2O3在1 750 ℃常壓燒結1 h可獲得相對密度大于99%的Sialon陶瓷；La2O3可部分或大部分取代Y2O3，混合燒結助劑的最佳燒結溫度(1 800 ℃)略高于單純以Y2O3為燒結助劑的最佳燒結溫度(1 750 ℃)。加入La抑制了α′相和YAG相的生成，選擇合適的工藝條件，可制得α′+β′復相陶瓷。探討了用SolGel化學法混料代替機械法混料的可能性，由于γ Al2O3轉變成 α Al2O3等原因，化學混料法的效果不如機械法。
關鍵字: Sialon; 常壓燒結; 燒結助劑
sintering of Sialon ceramics
（State Key Laboratory for Powder Metallurgy,
Central South University,Changsha 410083, P.R.China）
Abstract:The pressureless sintering process adding Y2O3 and Y2O3+La2O3 as sintering aids was studied. It was found that a Sialon ceramic adding 6% Y2O3 as sintering aid was sintered to over 99% TD when sintered at 1750℃ for 1h. Y2O3 can partially be replaced by La2O3, 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-Al2O3 to α-Al2O3 in the sintering process and other factors.
Key words: Sialon; pressureless sintering; sintering aid
