Silicon nitride ceramic slurry as well as preparation method and application thereof: Fid-Bau Portal

Silicon nitride ceramic slurry as well as preparation method and application thereof

ZHANG BO / XU HAIXIAN / ZHANG HAO / DANG JUNJIE / SHI CHANGDONG

The invention discloses silicon nitride ceramic slurry as well as a preparation method and the application thereof. The silicon nitride ceramic slurry is prepared from silicon nitride raw material powder, a sintering aid, a solvent, a dispersing agent, a binder, a plasticizer and a leveling agent, wherein the specific surface area of the silicon nitride powder is 0.2-5 m <2>/g; The mass ratio of the silicon nitride raw material powder to the sintering aid to the solvent to the dispersing agent to the binder to the plasticizer to the leveling agent in the slurry is 1: (0.01-0.05): (1-1.3): (0.01-0.03): (0.1-0.2): (0.07-0.2): (0.005-0.1). According to the invention, a proper leveling agent is added into the low-boiling-point solvent, so that the surface tension of the slurry is optimized, and the low-boiling-point solvent is matched, so that the slurry can be quickly dried in application, the requirement on the length of a casting machine is low, the surface of a raw ceramic chip is smooth, and the thickness consistency is high; the ceramic biscuit which is flat, uniform, high in density and controllable in thickness is prepared in cooperation with multi-section temperature curve control during drying, scraper height control and isostatic pressing treatment, and later biscuit forming machining and sintering are facilitated.

本发明公开了一种氮化硅陶瓷浆料及其制备方法和应用，包括：氮化硅原料粉体、烧结助剂、溶剂、分散剂、粘结剂、增塑剂和流平剂，所述氮化硅粉体比表面积为0.2～5m2/g；所述浆料中氮化硅原料粉体、烧结助剂、溶剂、分散剂、粘结剂、增塑剂和流平剂的质量比为1：0.01～0.05：1～1.3：0.01～0.03：0.1～0.2：0.07～0.2：0.005～0.1。本发明通过在低沸点溶剂中添加适当流平剂，优化了浆料的表面张力，配合低沸点的溶剂，使得浆料在应用能快速实现干燥，对流延机的长度要求低，生瓷片表面平滑，厚度一致性高；配合干燥时多段温度曲线控制、刮刀高度控制，结合等静压处理，制得平整、均一、高密度且厚度可控的陶瓷素坯，有利于后期素坯成型加工及烧结。

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