郗威,周杨杨,刘鹏飞,韩召

• 1:安徽工业大学冶金工程学院

摘要(Abstract)：

氮化硅(Si_3N_4)粉体极易氧化，表面氧化硅层氧含量过高会对Si_3N_4陶瓷的力学性能和导热性能产生不利影响。在球磨法细化Si_3N_4粉体过程中，分别选取去离子水、无水乙醇和质量分数为20%的氢氧化钠(NaOH)溶液作为3种球磨介质，研究不同球磨介质对细化后的Si_3N_4纳米粉体的颗粒粒径和表面氧化硅层氧含量的影响；采用X射线衍射分析仪、激光粒径仪、场发射扫描电子显微镜、高分辨透射电子显微镜、氧氮分析仪、傅里叶变换红外光谱仪和X射线光电子能谱仪分析Si_3N_4纳米粉体的物相组成、粒径分布、微观形貌、表面氧化硅层的氧含量、化学基团和化学键种类及浓度；探讨碱液法球磨制备表面氧化硅层的氧含量较低的Si_3N_4粉体的机制。结果表明：以NaOH溶液为球磨介质时，Si_3N_4粉体先与水反应生成非晶氧化硅层，NaOH再和氧化硅层发生反应，球磨过程加速了Si_3N_4粉体表面氧化硅层的溶解和剥离，降低了表面氧化硅层的氧含量，减小了颗粒粒径，实现了Si_3N_4粉体的细化；表面氧化硅层的氧的质量分数从1.00%仅增加到1.25%,颗粒平均粒径从3.50μm减小为0.71μm,微观形貌由长条状变成分散性较好的球形颗粒；球磨后的Si_3N_4纳米粉体的O—Si—O键的物质的量浓度从15.06%减小为11.24%;与去离子水和无水乙醇相比，以NaOH溶液为最优球磨介质。

关键词(KeyWords)： 球磨介质;氮化硅粉体;颗粒微观形貌;表面氧化硅层;氧含量

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目,编号：52072381

作者(Author): 郗威,周杨杨,刘鹏飞,韩召

DOI: 10.13732/j.issn.1008-5548.2023.06.008

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