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.
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β-Sialon
,
null
,
null
,
null
Hong TAO
,
Chengji DENG
,
Lianmeng ZHANG
,
Runzhang YUAN
材料科学技术（英文）
Al/Al2O3 composites of different ratios were hot-press sintered at 575 similar to 640℃ under a pressure of 30 MPa for 2 h in a vacuum furnace. It was found that the relative density of the Al/Al2O3 composites could be increased evidently with the rise of sinter temperature. No reaction occurred between Al and Al2O3 at the sinter temperatures. Under 640℃-30 MPa-2 h experimental condition, Al/Al2O3 system FGM was successfully fabricated, and its density range changed quasi-continuously from 2.887x10(3) kg/m(3) to 3.1909x10(3) kg/m3 within the middle 1.0 mm thickness range.
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