利用热压工艺制备了组份为（ Ｃａ ， Ｍｇ）ｘ Ｓｉ１２ － ３ｘ Ａｌ３ｘ Ｏｘ Ｎ１６ － ｘ （ｘ ＝ ０３ 、０６ 、１０ 和１４） 的（ Ｃａ ， Ｍｇ） α- Ｓｉａｌｏｎ研究结果发现， 当ｘ≥１.０ 时， 材料的主晶相为α Ｓｉａｌｏｎ 和含 Ｍｇ 的 Ａｌ Ｎ 多型体多型体的含量随ｘ 值的增加而变大以复合添加剂取代单一添加剂， 不仅改善了α- Ｓｉａｌｏｎ 的烧结性能， Ｔ Ｅ Ｍ 和 Ｅ Ｄ Ａ Ｘ 的结果还进一步表明添加的 Ｃａ ＋ ＋ 离子进入α-Ｓｉａｌｏｎ ， 而 Ｍｇ＋ ＋ 离子进入 Ａｌ Ｎ-多型体， 为净化氮陶瓷的晶界提供了有效途径.
(Ca,Mg)-α-Sialon for the compositions MxSi3-xAlxOxN16-x with x ranging from 0.3 to 1.4 were prepared by hot-pressing technique. The result showed that the
crystalline phase in the sintered material consists of α-Sialon and Mg-containing AlN-polytypoid when x is equal to or greater than
1.0 and the AlN-polytypoid content increases as the x-value increases. By the use of duplex metal oxide CaO/MgO, instead of CaO, as additives
to form α-Sialon, the material possesses a better sintering ability. TEM and EDAX results further revealed that the most of added Mg++ can be incorporated into the Sialon to form magnesium AlN-polytypoid
phase, whereas the most added Ca++ enters α-Sialon structure. The formation of magnesium-containing AlN-polytypoid phase in the composite
materials can provide a new approach to reduce the amount of glassy phase at the grain boundary.
参考文献
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