Gelcasting of Carbide Ceramics
In this paper, the aqueous gelcasting of carbide ceramics (SiC, TiC, and B4C) were studied systematically. N, N-dimethyl acrylamide (DMAA) and N, N’-methylenebisacrylamide (MBAM) are used as organic monomer and cross-linker respectively. The initiator was selected from ammonium persulfate (APS) and 2, 2’-azobis[2-(imidazolin-2-yl) propane]dihydrochloride (AZIP2HCl) in accordance with the dispersant used. After gelcasting and drying, SiC samples can be densified by pressureless sintered at 2000°C. The gelcasted TiC green samples can be densified at 1530°C in vacuum with the strength as high as 1062.7749.81. The gelcasted B4C samples can be easily densified at 2250°C by pressureless sintering with the relative density around 96.2%. Results showed that it was possible to prepare carbide ceramics with complex shape and satisfied mechanical properties by gelcasting.
Katsutoshi Komeya, Yi-Bing Cheng, Junichi Tatami and Mamoru Mitomo
D. L. Jiang "Gelcasting of Carbide Ceramics", Key Engineering Materials, Vol. 403, pp. 163-164, 2009