(1. 濟南大學 材料科學與工程學院，濟南 250022；
2. 沈陽大學 建筑工程學院，沈陽 110004；
3. 東北大學 材料與冶金學院，沈陽 110006)
摘 要: 在制備YAG(釔鋁石榴石）多晶體的不同條件下， 對其固相反應過程中的物相變化、 YAG燒結體透明程度、 密度和顯微組織進行了觀測和分析。 結果表明： Y3+的擴散速率是決定固相反應進程的主要因素， 將高活性的Y2O3 納米微粒與Al2O3 粉均勻混合，可促進固相反應的完成， 使獲得YAG透明體的燒結溫度降低100～200℃， 保溫時間也顯著縮短； 氣孔和晶界對光的反射和散射是YAG多晶體透光性降低的主要原因， 采用真空燒結可提高YAG燒結體的密度， 改善晶體結構的均勻度， 有利于提高YAG多晶體的透光性。
關鍵字: YAG多晶體； 固相反應； 制備條件； 透光性
HAO Zhe2, SUN Xu-dong3
（1. School of Materials Science and Engineering,
Ji＇nan University, Ji＇nan 250022, China;
2. School of Architecture Engineering,
Shenyang University, Shenyang 110004, China;
3. School of Material and Metallurgy,
Northeastern University, Shenyang 110006, China）
Abstract:It was observed and analyzed that phase transformation during the solid-state reaction, transparency, density and microstructure of YAG polycrystalline sintered under different fabrication conditions. The results show that the diffusion velocity of Y3+ plays an important role during the solid-state reaction. When higher active Y2O3 nano-powders used as the starting materials are uniformly mixed with Al2O3 powders, the solid-state reaction is obviously promoted. The sintering temperature to get transparent YAG ceramics is reduced by 100～200℃, and the heating period is also shortened. The reflecting and scattering of pores and grain boundaries to light are main reasons decreasing the transparency of YAG polycrystalline. Improving the density of vacuum-sintered YAG and its homogeneity of crystalline structure is helpful to enhancing the transparency of YAG polycrystalline.
Key words: YAG polycrystalline； solid-state reaction； fabrication conditions; transparency
