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J. Korean Ceram. Soc. > Volume 32(8); 1995 > Article
Journal of the Korean Ceramic Society 1995;32(8): 893.
수열 합성에 의해 제조된 다공성 Wollastonite Ceramics의 특성
김병훈, 나용한
전남대학교 무기재료공학과
Characteristics of Porous Wollastonite Ceramics Fabricated by Hydrothermal Synthesis
ABSTRACT
The porous wollastonite ceramics were fabricated after firing calcium silicates, obtained using natural resources and by-products of power plants by hydrothermal synthesis, without organic fibers or asbestos for reinforcement agent. A specimen from diatomite as a SiO2 staring raw material had the highest strength owing to normal grain growth and good densification from homogeneous sperhcial C-S-H hydrates. A specimen from SiO2 sol as a SiO2 starting raw material showed tobermolite, but fly ash and mixed system did xonotlite after hydrothermal synthesis. The specimen from fly ash showed the lowest firing shirikage and strength changes in the firing range from 50$0^{circ}C$ to 120$0^{circ}C$. The other phases in all specimens changed to wollastonite phase after firing at 100$0^{circ}C$. Also the average pore size was distributed from 0.2${mu}{textrm}{m}$ to 2${mu}{textrm}{m}$.
Key words: Wollastonite, Hydrothermal synthesis, Fly ash, Porous ceramics
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