由热压工艺制备了组份为ＣａｘＳｉ１２－３ｘＡｌ３ｘＯｘＮ１６－ｘ（０．３≤ｘ≤２．０）的Ｃａ－α－Ｓｉａｌｏｎ陶瓷。本文报道了它的反应过程、相组成、晶胞参数随组份的变化和显微结构的研究结果．研究结果表明，当ｘ≥１．０时，制备的Ｃａ－α’样品的物相由α－Ｓｉａｌｏｎ和ＡＩＮ多型体２１Ｒ组成，其中２１Ｒ的含量随ｘ值的增加而变大．ＴＥＭ的观察结果与物相分析相符，并进一步揭示了在Ｃａ－α－Ｓｉａｌｏｎ样品中长颗粒形貌的α－Ｓｉａｌｏｎ的存在．
Ca-α-Sialons for the compositions MxSi3-xAlxOxN16-x with x ranging from 0.3 to 2.0 were prepared by hot-pressing technique. The reaction
sequence, formation behavior, variation of lattice parameters with the compositions and microstructure of Ca-α-Sialon were reported in this paper. The result
showed that the crystalline phase of Ca-α-Sialon in the sintered material consists of α-Sialon and AlN-polytypoid 21R when x is equal to or greater than 1.0 and the 21R content increases as the x-value increases. TEM observation
confirmed the phase assemblages of Ca-α-Sialon samples and further revealed the existence of elongated α’grain in the materials.
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