Alpha-phase silicon nitride powder and preparation method thereof: Fid-Bau Portal

Alpha-phase silicon nitride powder and preparation method thereof

GAO YUKUN / WU YUXIAO / SHEN GUODONG

The invention provides alpha-phase silicon nitride powder and a preparation method thereof.The preparation method of the alpha-phase silicon nitride powder comprises the steps that by-products generated in the technological process that silicon powder serves as a raw material to produce silicon nitride are mixed with other raw materials to obtain a mixture, and the mixture is subjected to combustion synthesis to obtain the alpha-phase silicon nitride powder, the other raw materials comprise silicon powder and an additive, and in parts by mass, the by-product accounts for 61-65 parts, the silicon powder accounts for 20-30 parts, and the additive accounts for 10-15 parts. According to the preparation method of the alpha-phase silicon nitride, by-products generated in the technological process of producing the silicon nitride by using the silicon powder as the raw material are recycled, waste is turned into wealth, the alpha-phase silicon nitride powder is prepared, extra silicon nitride powder does not need to be used as a diluent in the preparation process, the production cost is greatly reduced, and the method is suitable for industrial production. The prepared alpha-phase silicon nitride powder has the advantages of being high in phase content, large in specific surface area, easy to grind, high in sintering activity and the like.

本发明提供了一种α相氮化硅粉体及其制备方法，α相氮化硅粉体的制备方法包括将硅粉为原料生产氮化硅的工艺流程中产生的副产物与其他原料混合得到混合物，将所述混合物燃烧合成得到α相氮化硅粉体，其中，其他原料包括硅粉和添加剂，按照质量份数计，所述副产物为61‑65份，所述硅粉为20‑30份，所述添加剂为10‑15份。本发明的一种α相氮化硅的制备方法利用硅粉为原料生产氮化硅的工艺流程中产生的副产物进行回收利用，变废为宝，制备出α相氮化硅粉体，在制备过程中无需额外的氮化硅粉作为稀释剂，极大的降低了生产成本，制备得到的α相氮化硅粉体具有相含量高、比表面积大，易于研磨，烧结活性高等优点。

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