1. Preparation of HEMA gel-casted SiC ceramics combined with LPS sintering.
- Author
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Qin, Zixuan, Xu, Wentao, Ling, Junrong, Mu, Tinghai, and Zhou, Youfu
- Subjects
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SINTERING , *SPECIFIC gravity , *FLEXURAL strength , *CERAMICS , *FRACTURE strength , *HYDROGELS , *SLURRY - Abstract
Densified SiC ceramics were prepared by using gel-casting method combined with liquid-phase sintering (LPS). In this study, a low-toxicity gel-casting system based on 2-hydroxyethyl methacrylate (HEMA) and N, N′-methylene acrylamide (MBAM) as monomer and crosslinker respectively, was first applied to SiC fabrication. The effects of the processing parameters on gel-casting were investigated in detail to achieve optimized rheological behavior and green body strength. The best result was obtained in the slurry with solid content of 50 vol%, dispersant of 0.4 wt% and monomer/crosslinker ratio of 20 at pH10. With the modified ternary sintering aids (Al 2 O 3 –Y 2 O 3 –CeO 2) added, the densification can be realized at low temperature. After pressureless sintering at 1850 °C for 2 h, the sample with best mechanical properties was obtained. The highest relative density, hardness, flexural strength and fracture toughness were 96.23%, 24.94 GPa, 423.95 MPa and 4.78 MPa/m1/2, respectively. Present work provides an environmentally friendly and energy-saving process for preparing SiC ceramics with excellent properties. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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