溶胶凝胶原位成型陶瓷结合剂砂轮中碳化硅的改性

发布时间：2018-03-29 18:17

本文选题：无机陶瓷材料　切入点：表面改性　出处：《材料研究学报》2017年09期

【摘要】：使用硅烷偶联剂KH550作为表面活性剂对碳化硅微粉表面进行改性,使用扫描电镜、X射线衍射仪、激光粒度分析仪和红外光谱仪等手段研究了改性前后微粉的形貌、表面性质、粒度分布及烧结体微观形貌。结果表明,硅烷偶联剂与碳化硅通过接枝反应在其表面形成包覆层,但是不改变其物相和结构。改性后碳化硅微粉的团聚减少,因此平均粒径减小;颗粒间的静电斥力和空间位阻增大,改善了碳化硅颗粒在溶胶中的悬浮稳定性和分散性。与未改性的SiC相比,用溶胶凝胶原位成型SiC/陶瓷复合材料改性后SiC与陶瓷的烧结体结构均匀,抗弯强度较高。
[Abstract]:The surface of silicon carbide powder was modified by silane coupling agent KH550. The morphology and surface properties of the powder were studied by means of X-ray diffractometer, laser particle size analyzer and infrared spectrometer. The results showed that the silane coupling agent and silicon carbide formed a coating layer on its surface through grafting reaction, but it did not change its phase and structure. After modification, the agglomeration of silicon carbide powder decreased. The electrostatic repulsion force and steric resistance between the particles increased, which improved the suspension stability and dispersion of silicon carbide particles in the sol. Compared with the unmodified SiC, the average particle size decreased. The sinter structure of SiC and ceramics modified by sol-gel in-situ molding SiC/ ceramic composite is uniform and the flexural strength is high.
【作者单位】：湖南大学材料科学与工程学院;
【基金】：国家自然科学基金(51375157)~~
【分类号】：TQ163.4

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