氮化硅陶瓷的注射成型工艺研究

采用注射成型与气压烧结结合的工艺，可以低成本、大批量制备出体积小、精度高的陶瓷异形件。本文以低密度聚乙烯(LDPE)和乙烯-醋酸乙烯共聚物(EVA)为黏结剂，在注射温度165 ℃、注射压力85 MPa的条件下制备氮化硅坯体，通过热脱脂工艺和烧结动力学测试，得到了完整的氮化硅注射成型工艺路线，并研究了喂料固含量对坯体密度、烧结密度和维氏硬度的影响，以及喂料在140~160 ℃时的非牛顿指数变化。结果表明：喂料的最佳固含量为52.42%(体积分数)，该条件下制备的氮化硅注射坯体密度为2.10 g/cm3，烧结密度为3.23 g/cm3，维氏硬度为（15.24±0.34） GPa；喂料在160 ℃时的非牛顿指数最小，即在该温度下喂料的流变性最好。

Abstract

With the combination of injection molding and gas pressure sintering, ceramic shaped parts with small size and high precision can be prepared in large quantities at low cost. In this paper, low density polyethylene (LDPE) and ethylene-vinyl acetate copolymer (EVA) were used as binders to prepare silicon nitride green bodies under injection temperature of 165 ℃ and injection pressure of 85 MPa. The complete silicon nitride injection molding process route was obtained by thermal degreasing process and sintering kinetics test. The effect of feedstock solid content on green body density, sintering density and Vickers hardness and the non-Newtonian index change of feedstock at 140~160 ℃ were studied. The results show that the optimum solid content of feedstock is 52.42% (volume fraction). The density of silicon nitride injection green body prepared under this condition is 2.10 g/cm3, the sintering density is 3.23 g/cm3, and the Vickers hardness is (15.24±0.34) GPa. The non-Newtonian index of feedstock is smallest at 160 ℃, that is, the rheological of feedstock is the best at this temperature.

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申常胜, 王瑞强, 李镔, 韦中华, 陈松, 陈波, 王卫国, 张伟儒. 氮化硅陶瓷的注射成型工艺研究[J]. 硅酸盐通报, 2023, 42(8): 2915. SHEN Changsheng, WANG Ruiqiang, LI Bin, WEI Zhonghua, CHEN Song, CHEN Bo, WANG Weiguo, ZHANG Weiru. Injection Molding Process of Silicon Nitride Ceramics[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(8): 2915.

氮化硅陶瓷的注射成型工艺研究

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