中文摘要：

在开发迭代燃烧合成这种新工艺的基础上，进一步研究了以迭代的方式加入稀释剂对燃烧合成Si3N4的作用和影响。研究表明，以迭代的方式加入Si3N4稀释剂，可以有效的控制燃烧反应的最高温度，能够实现以低α相含量的Si3N4粉体来制备出高α相含量的Si3N4粉体，从而使Si3N4产物的α相含量得到提高。同时发现，当稀释剂加入量X较小（x=0．375）时，稀释剂的α相含量对生成si3N4产物的α相含量影响较大，当热力学因素和动力学因素的作用达到平衡时，产物中si生成的α—Si3N4的转化率最高值达到89％；当加入稀释剂的量较大（如x≥0．40）时，稀释剂的这种作用不明显。适宜的稀释剂加入量x值应当在0．45左右。所得结果对工业化生产α—Si3N4粉体具有指导作用。

英文摘要：

The reaction temperature of the Si-N2 system had been controlled successfully by adding the diluent of Si3N4 to the system iteratively. The α phase content of so-obtained Si3N4 （αSi） was affected by α phase content of diluent Si3N4 （αSN）. High α content of Si3N4 was prepared from low α content of Si3N4 by iterative combustion synthesis. The influence was obvious in small mole fraction of diluent Si3N4 （x = 0.375） diluent. But it was not so noticeable in larger mole fraction of diluent Si3N4 （x≥ 0.40）. The relationship of αSi vs αSN or x had been obtained in the range of x value from 0.375 to 0.45.