氮化硅粉体的微波合成  

Microwave Synthesis of Si_3N_4 Powder

作　　者：杨军 夏广斌 彭虎 李志杰 

机构地区：[1]长沙隆泰微波热工有限公司,长沙410013

出　　处：《材料导报》2007年第S2期127-129,共3页Materials Reports

摘　　要：以硅粉为原料,利用微波加热的方法制备以β-Si3N4为主体的氮化硅粉体,研究了氮化温度、添加稀释刺和添加NH4HCO3对氮化物相的影响。结果表明:微波合成氮化硅在1380℃反应得到的相组成为α-Si3N4和B-Si3N4,其中以形貌呈柱状或棒状的β-Si3N4为主体。讨论了微波合成氮化硅能够在较低温度下生成β-Si3N4的原因。添加稀释剂和NH4HCO3有助于硅粉的完全氮化。对硅粉直接氮化的热力学特征进行分析,结果显示提高温度并不利于Si3N4粉体的合成。Si3N4 power is prepared from silica powder, using microwave irradiation as energy source. The effect of temperature, diluents content and NH4HCO3 are studied on product phases. The synthesized Si3N4 powders are a mixture ofα-Si3N4 and main columnarβ-Si3N4. Complete nitridization of silica is achieved through the addition of diluents and NH4HCO3. Higher temperatures are not useful during synthesis of Si3N4 power.

关 键 词：微波 氮化硅 β-Si₃N₄ 热力学分析 

分 类 号：TQ174.1[化学工程—陶瓷工业]