纳米非晶Si2N2O粉末的SPS烧结及烧结体性能研究  

SPS sintering of amorphous nano-sized Si_2N_2O powders and characterization of its sintered bulks

作　　者：王起[1,2] 焦树强 朱鸿民 赵世强 WANG Qi;JIAO Shuqiang;ZHU Hongmin;ZHAO Shiqiang(School of Metallurgical and Ecological Engineering University of Science and Technology Beijing, Beijing 100083, China;State Key Lab of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学冶金与生态工程学院 [2]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《有色金属科学与工程》2017年第5期58-63,共6页Nonferrous Metals Science and Engineering

基　　金：国家高技术研究发展计划(2012AA062302);国家自然科学基金优秀青年基金资助项目(51322402)

摘　　要：通过低温还原,以Si_2OCl_6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Si_2N_2O粉末.在不加任何烧结助剂的条件下,通过放电等离子体烧结,得到了致密的陶瓷块体.制得的纳米非晶粉末颗粒尺寸约为20 nm,XRD结果显示样品在1 100℃开始晶化.进一步考察了不同烧结温度下陶瓷的抗氧化性和力学性能,致密块体在1 600℃下经过20 h氧化后,其增重仅有1.1%,烧结块体的力学性能随着烧结温度的增加而迅速增加,当烧结温度高于1 500℃时,继续增加烧结温度力学性能的增加趋势变得平缓.1 500℃烧结样品的维氏硬度、强度和断裂韧性分别达到了19.6 GPa,440 MPa和4.1 MPa·m1/2.Through XRD analysis,the obtained amorphous nano-sized Si2N2O powders,with the size of about20nm,began to crystallize at1100℃.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 only1.1%after twenty-hour oxidation at1600℃.The mechanical properties of sintered bulks increased rapidly with the increase of sintering temperature.When the temperature was over1500℃,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 at1500℃ reached19.6GPa,440MPa and4.1MPa·m1/2respectively.When Si2OCl6was 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.

关 键 词：液氨 纳米 非晶 Si2N2O粉末 放电等离子体烧结 

分 类 号：TQ175.7[化学工程—硅酸盐工业] TF123.7[冶金工程—粉末冶金]