根据Y-Si-Al-O-N相图设计Y_2O_3掺杂α-sialon陶瓷的组成,采用热压烧结方法在1900℃保温30min制备了设计成分为Y_(0.4)Si_(9.8)Al_(2.2)O_(1.0)N_(15)的sialon陶瓷,研究了升温速率对陶瓷致密化过程、物相组成以及微观结构的影响规律.结果表明,所制备的陶瓷相组成均为α-sialon;不同升温速率陶瓷的致密化过程曲线变化趋势相同,但随升温速率增大向高温区平移,收缩的起止温度和峰值收缩速率均随升温速率增大而增大;快速升温有利于提高晶核密度,抑制柱状晶发育,柱状晶的尺寸和长径比随升温速率增大而减小.
The composition of yttrium-doped α-sialon was designed according to Y-Si-Al-O-N phase diagram,and the α-sialon with composition of Y_(0.4)Si_(9.8)Al_(2.2)O_(1.0)N_(15) was fabricated by hot pressing at 1900℃ for 30min,then the effects of heating rate on the densification,phase composition and microstructure were investigated.It was found that single phase α-sialon ceramics were prepared in all the samples,and all the densification process curves show the same changing tendency for the sialon sintered by different heating rate,but they parallel move to high temperature zone with the increase of heating rate,and the start and finish temperature of shrinkage,the peak value of shrinkage rate of the ceramics all increase with the increase of heating rate.Higher heating rate contribute to increase nucleation density and inhibit elongated grain developing,and the size and aspect ratio of elongated grains decrease with the increase of heating rate.
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