Preparation and properties of Sialon-SiC suspension for gelcasting

Abstract

The raw materials of Al, Si, SiO₂, and SiC were used to prepare Sialon-SiC suspension for gelcasting by adjusting the pH value and content of SiC particle and controlling the milling time. The result shows that the stable suspension for gelcasting could be got by adding 40wt% SiC particle at pH=8. Al would easily hydrolyze to deteriorate the suspension when the milling time was too long, so the optimum milling time should be less than 100 minutes. At last, a well-dispersed suspension with a viscosity of less than 0.32 Pa·s was obtained and the solid loading was 54vol%.

Keywords

gelcasting / Sialon-SiC / suspension / viscosity

References

[1] Omatete O O, . Gelcasting a New Ceramic Forming Process. Am. Ceram. Soc. Bull., 1991, 70(10): 1641-1649.

[2] Mark A Janney, Ugbemio Omate.Method for Molding Ceramics Poweders Using Water-based Gelcasting Process. US patent, No. 5145908, Sep. 8, 1992

[3] Yong Huang, Jinlong Yang, Zhipeng Xie, Jianhao Li. Development of Forming Processes of High Performance Ceramics. Modern Technique of Ceramic, 1995, 16(4): 4-6.

[4] Jinlong Yang, Zhipeng Xie, Qiang Tang, Yong Huang. Studies on Rheological Behavior and Gelcasting of α-Al₂O₃. Journal of the Chinese Ceramic Society, 1998, 26(1): 41-43. (in Chinese)