溶胶凝胶-碳热还原法制备Si3N4纳米粉末  

Preparation of Si_3N_4 nanometer powders by sol-gel method and carbothermal reduction method

作　　者：陈宏[1,2] 穆柏春[1] 赵连俊 

机构地区：[1]辽宁工业大学材料与化学工程学院,辽宁锦州121001 [2]辽宁石化职业技术学院应用化学系,辽宁锦州121001

出　　处：《粉末冶金技术》2009年第2期114-118,共5页Powder Metallurgy Technology

基　　金：辽宁省自然科学基金资助项目(20062193,9910300401);辽宁省教育厅科研基金项目(20031008);辽宁省专利局资助项目

摘　　要：以硅溶胶为硅源,有机碳为碳源,有机氮和氮气为氮源,先采用溶胶-凝胶法制备前驱体,然后进行碳热还原制备Si3N4陶瓷纳米粉体。主要研究了硅碳比、反应温度、氮气流量、保温时间等工艺因素对氮化硅粉体生成的影响。碳热还原制备Si3N4纳米粉体的最佳工艺条件为:碳硅比(摩尔比)为3.5∶1,氮气流量为3L/min,煅烧温度为1500℃,保温时间2h。在以上最佳工艺条件下,可制备出纯的Si3N4纳米粉体,其中α-氮化硅为90.8%,β-氮化硅为9.2%,平均粒径为43.82nm。Si3N4 nanometer powders were synthesized by sol-gel method and carbothermal reduction method. The organic carbon was chosen as carbon source, silica-gel was chosen as silicon source, organic nitrogen and nitrogen gas were chosen as nitrogen source respectively. It was discussed emphatically that the effects of carbon/silicon molar ratio, reaction temperature, nitrogen flow, heat preservation time on Si3N4 ultra-fine powder. The optimal technical parameters of Si3 N4 nanometer powder preparation are as follows： carbon/silicon molar ratio： 3.5/1, nitrogen flow： 3L/min, reaction temperature 1 500℃ ,hold time 2h. 100% Si3N4 ultra-fine powder can be obtained with the optimal technical parameters, the average size of obtained Si3 N4 powders is 43.82nm.

关 键 词：SI3N4陶瓷 纳米粉体 溶胶凝胶 碳热还原 前驱体 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ246.35[化学工程—硅酸盐工业]