纳米非晶Si2N2O粉末的SPS烧结及烧结体性能研究

纳米非晶Si2N2O粉末的SPS烧结及烧结体性能研究

王起;焦树强;朱鸿民;赵世强

【期刊名称】《有色金属科学与工程》 【年(卷),期】2017(008)005

【摘要】Through XRD analysis, the obtained amorphous nano-sized Si2N2O powders, with the size of about 20 nm, began to crystallize at 1100 ℃. By further investigating the oxidation resistance and mechanical properties of the ceramics sintered at different temperatures, the study found that the weight gain of dense bulks was only 1.1% after twenty-hour oxidation at 1600 ℃. The mechanical properties of sintered bulks increased rapidly with the increase of sintering temperature. When the temperature was over 1500 ℃, the increasing tendency of the mechanical properties became slowly with the rise of temperature. The Vickers hardness, flexural strength and fracture toughness of the sintered samples at 1500 ℃ reached 19.6 GPa,440 MPa and 4.1 MPa·m1/2respectively. When Si2OCl6 was taken as raw materials and sodium solution as the reducing agent, amorphous nano-sized Si2N2O powders were successfully synthesized in liquid ammonia solution through low temperature reduction. Thus dense ceramic bulks were obtained via spark plasma sintering without any sintering additives.%通过低温还原,以Si2OCl6为原料,以Na溶液为还原剂,在液氨溶液中成功合成了纳米非晶态Si2N2O粉末.在不加任何烧结助剂的条件