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研究了摩尔比n(Y2O3):n(Al2O3)分别为2:1、1:1和3:5的粉体在不同温度发生的相变及其高温烧结的陶瓷。Y2O3-Al2O3粉体经球磨后在1750℃真空烧结制备陶瓷。用差热-热重、X射线衍射及扫描电子显微镜表征制备的Y2O3-Al2O3材料。结果表明:在低于800℃时,Y2O3-Al2O3之间未发生反应;在1000℃煅烧后,出现Y4Al2O9(YAM)相;1200℃煅烧后,出现YAlO3(YAP)相和钇铝石榴石(yttrium aluminumgarnet,YAG)相。n(Y2O3):n(Al2O3)=3:5粉体在1400℃煅烧后生成YAG纯相。n(Y2O3):n(Al2O3)=2:1、3:5粉体烧结的陶瓷的物相分别为YAM相和YAG相,其相对体积密度分别为97.8%和99.95%,n(Y2O3):n(Al2O3)=1:1粉体烧结陶瓷的物相为多相共存,3种配比制备陶瓷断口的形貌差别较大。
The ceramic powders with different molar ratios of n (Y2O3): n (Al2O3) of 2: 1, 1: 1 and 3: 5 at different temperatures and their high temperature sintering were investigated. Y2O3-Al2O3 powder after ball milling at 1750 ℃ vacuum sintering ceramics. The prepared Y2O3-Al2O3 material was characterized by DTA-TG, X-ray diffraction and scanning electron microscopy. The results show that there is no reaction between Y2O3 and Al2O3 at temperatures lower than 800 ℃, Y4Al2O9 (YAM) phase appears after calcination at 1000 ℃, YAlO3 (YAP) phase and yttrium aluminum garnet aluminumgarnet, YAG) phase. n (Y2O3): n (Al2O3) = 3: 5 The powders were calcined at 1400 ℃ to form pure YAG phase. The relative bulk densities of Y2O3 and YAG are 97.8% and 99.95%, respectively, for n (Y2O3): n (Al2O3) = 2: 1, 3: The phase of n (Al 2 O 3) = 1: 1 powder sintered ceramics coexisted in multiphase, and the morphology of the three kinds of prepared ceramic fractures differed greatly.