用六面顶超高压在1.0-5.0GPa,25~1500℃条件下烧结激光法制备的纳米非晶Si3N4粉,有“冷烧结”特代表现为:在5GPa,室温下压制的块体密度达理论值的93%,这是高压下纳米粒子产生流变的结果当烧结温度较低(800~950℃)时,高压烧结体为棕色透明的致密(98%)纳米非晶块体;烧结温度较高(1300~1500℃)时,形成纯白色致密纳米晶Si3N4块体,硬度为15.53~1605GPa研究表明,超高压烧结纳米陶瓷粉可显著降低烧结温度,控制晶粒生长,是获得致密纳米材料的有效途径
The sintering behavior of the laser-synthesized nano-amorphous Si3N4 powders under pressure of 1.0~ 5.0GPa in temperature range of 25~ 1500℃ has been studied. It has been found that the nano powders exhibit a "cold sintering" behavior. The nano powders we
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