Xingyuan LUO
,
Jialin SUN
,
Chengji DENG
,
Yanruo HONG
材料科学技术（英文）
It is worth to study the synthesis of β-Sialon from coal gangue, because coal gangue is a waste of coal production and is a high quality kaolin contained carbon which is a perfect raw material of contained reducer itself for synthesis of β-Sialon. The study showed that a high conversion rate of 95% from coal gangue to β-Sialon could be obtained by using process of carbothermal reduction nitridation when strictly controlled the thermodynamic conditions of synthesis. For controlling the synthesis conditions easy, the details of the effects of pco, po2 and T on the conversion rate of β-Sialon were discussed detailedly and the phase diagrams of oxygen pressure vs composition for Si3N4-AlN-Al2O3-SiO2 system at 1350, 1500, and 1600oC were constructed in the paper.
关键词:
β-Sialon
,
null
,
null
,
null
Youfen LI
,
Yanruo HONG
,
Xiangchong ZHONG
,
Tingshou LI
材料科学技术（英文）
Non-isothermal kinetic research has been carried out on oxidation behavior of β-Sialon in diphase β-Sialon/Al2O3 composite at high temperatures. A kinetic formula is established for non-isothermal oxidation process of β-Sialon. The rate of oxidation process is controlled by chemical reaction at the initial stage and then by diffusion. The apparent activation energies and apparent rate constants at different temperatures are determined by treating TG data of the overall process.
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