研究了以Ｙ，Ｓｍ以及复合稀土Ｙ＋Ｓｍ分别作为α－Ｓｉａｌｏｎ的形成离子，组份为 ９０ｗｔ％ α－Ｓｉａｌｏｎ（ｍ＝ １，ｎ＝ １７）＋１０ｗｔ％１２Ｈ的样品在 １４５０～１８００℃热压条件下的致密化和反 应过程．结果表明，添加Ｙ２Ｏ３＋Ｓｍ２Ｏ３复合稀土对致密化最有利，不同的稀土元素对反应过 程有较大的影响，即在 Ｓｍ－组份中 α－Ｓｉ３Ｎ４很快消失， α－Ｓｉａｌｏｎ与 ＡＩＮ－多型体同时形成而 Ｙ－ 组份中α－Ｓｉ３Ｎ4消失较慢，α－Ｓｉａｌｏｎ的形成受到ＡｌＮ一多型体的抑制．
The densification and reaction sequence of 90wt%R-α' +10wt%12H (R=Y, Sm, Y+Sm) dual-phase ceramics hot-pressed in the temperature range of 1450~1800℃ were studied. The results show that the dual elements Y+Sm promote densification more effectively than Y-and Sin-element. In Sm-composition, Si3N4 disappears quickly and α-Sialon appears simultaneously with 12H--AIN--polytypoides. In Y--composition, however, Si3N4 dissolves slowly and 12H- AlN-polytypoid inhibits the formation of α-Sialon.
参考文献
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