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对高x值Ca-α-Sialon系统(Ca1.8Si6.6Al5.4O1.8N14.2)用无压烧结的方法得到了具有长颗粒形貌的α-Sialon陶瓷. 通过SEM观察研究了升温速度和中间保温等工艺因素对材料显微结构的影响规律,并结合反应过程的研究探讨了在Ca-α-Sialon中长颗粒α-Sialon晶粒的成核与生长机理. 结果表明,α-Sialon形成过程中较少的晶核数目及较多的液相量容易得到长颗粒的α-Sialon晶粒,并且中间相的形成与溶解会直接影响晶核数目与液相量.

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