中文摘要：

在Si3N4-SiO2-Al2O3-AIN体系中，采用拟抛物面规则对不同组成SiAION相的热力学性能进行了评估，并研究了β-SiAION相的合成热力学条件．以煤矸石为主要原料，加入适量碳黑作为还原剂，在不同气氛（空气或不同纯度的氮气）下合成了β-SiAION，并研究了β-SiAION粉料在不同气氛下的相转化．热力学分析表明，不同的SiAION相可以在合适的气氛参数Y=1g（Po2／P^θ）-2／31g（PN2／P^θ）下合成，较低的Y值有利于β-SiAION相的合成．过量碳存在时提高通氮纯度β将会降低气氛中的Y值，其关系式为Y=21g[（2-2α）／（2-α）]-2／31g[α/（2-α）]-15．616．实验结果表明：热力学分析得到的合适初始参数可以实现高纯[3-SiAION的可控合成，当初始参数为T=1800K，埋焦炭保护，通入氮气纯度α=0．995—0．999时可获得较好的结果．

英文摘要：

The Gibbs free values of different SiAlON were assessed by the thermodynamic quasi-paraboloid rule in Si3N4-AlN-SiO2-Al2O3 system and the thermodynamic parameter for β-SiAlON were explored at 1800K.The synthesis of β-SiAlON based on coal gangue and carbon black by carbonthermal reduction nitridation method,and phase transformation of β-SiAlON powder in various atmospheres（such as air or nitrogen of different purity） were discussed in detail.Thermodynamic analysis reveals that different SiAlON can be synthesized in suitable atmosphere parameter Y（Y=lg（PO2/Pθ）-2/3lg（PN2/Pθ）） at 1800K,and low Y value is beneficial to synthesis of β-SiAlON.When excessive carbon exists in the atmosphere,with the increase of purity（α） of initial nitrogen,the Y value decreases,and the relationship between purity（α） and Y value is Y=2lg[（2-2α）/（2-α）]-2/3lg[α/（2-α）]-15.616.The experiment results shows that the suitable initial parameters based on thermodynamic analysis is highly advantageous in controllable synthesis of high-purity β-SiAlON,the proper initial parameters is that samples,burying in coke,are sintered at 1800K in a flowing nitrogen atmosphere,the purity range of nitrogen is about 0.995-0.999.