Silicon nitride ceramic and preparation method thereof: Fid-Bau Portal

Silicon nitride ceramic and preparation method thereof

SUN FENG / WANG LU / WANG ZAIYI / HUANG XUEBIN / DONG TINGXIA / ZHANG LINLIN / DING HAO / XU JINMENG / JIANG ZIFEI

The invention discloses a silicon nitride ceramic and a preparation method thereof, and relates to the field of silicon nitride ceramics, and the specific preparation method comprises the following steps: preparing slurry; granulating the slurry, and then pressing into a silicon nitride ceramic ball biscuit; performing cold isostatic pressing on the ceramic ball biscuit after glue discharging; carrying out semi-sintering on the ceramic ball biscuit subjected to cold isostatic pressing to obtain a semi-sintered blank; re-sintering the semi-sintered blank to obtain a sintered blank; and processing the sintered blank to obtain the silicon nitride ceramic. Through combination of a semi-sintering process and a semi-sintered blank re-sintering process, on the premise of ensuring high performance of the silicon nitride ceramic, the atmosphere sintering temperature and the heat preservation time are reduced, the processing efficiency of the silicon nitride ceramic is obviously improved, the preparation cost is reduced, and compared with a traditional sintering process, the preparation method has the advantages that the cost is reduced; the process of semi-sintering and re-sintering is more obvious for improving the performance of the silicon nitride ceramic, and a feasible scheme is provided for low-cost and large-scale preparation of the high-performance silicon nitride ceramic.

本发明公开一种氮化硅陶瓷及其制备方法，涉及氮化硅陶瓷领域，具体制备方法包括制备料浆；将料浆造粒，然后压制为氮化硅陶瓷球素坯；对陶瓷球素坯排胶后冷等静压；对冷等静压后的陶瓷球素坯进行半烧得到半烧毛坯；对半烧毛坯进行再烧结，得到烧结毛坯；对烧结毛坯进行加工，得到所述氮化硅陶瓷。本发明通过“半烧工艺”和“半烧毛坯再烧结工艺”结合在保证氮化硅陶瓷高性能的前提下，降低了气氛烧结温度、保温时间，明显提升了氮化硅陶瓷的加工效率，降低了制备成本，相较于传统烧结工艺，“半烧+再烧结”的工艺对于氮化硅陶瓷性能的提升更明显，为高性能氮化硅陶瓷的低成本、大批量制备提供了可行的方案。

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