Effect of Aging pH Value on the Properties of Porous SiC Ceramics Produced through Coat-Mix Process

Hui Yang; Hong Sheng Zhao; Zhong Guo Liu; Zi Qiang Li; Kai Hong Zhang

doi:10.4028/www.scientific.net/KEM.512-515.770

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Effect of Aging pH Value on the Properties of...

Effect of Aging pH Value on the Properties of Porous SiC Ceramics Produced through Coat-Mix Process

Abstract:

The core-shell structure precursor powder was synthesized through coat-mix process, and a small amount of Al₂O₃, SiO₂ and Y₂O₃ composite additives were added. Porous silicon carbide ceramics were produced after molding, carbonization and sintering, and the crystalline phase, weight loss, porosity, bending strength, and thermal expansion coefficient were measured. The effect of aging pH value of coat-mix process on the characterization of porous SiC ceramics had been analyzed. The results indicate that the crosslink degree and curing rate of the phenolic resin is adjusted by changing the aging pH value, and the coating effect in the coat-mix process is improved. Thereby, the flexural strength, thermal expansion coefficient, porosity and pore distribution of the porous SiC ceramics could be adjusted according to the application requirements. When the pH value ranges from 3 to 5 or higher than 7, the phenolic resin shows a lower crosslink degree and char yield, while the ceramics show a higher porosity and a lower thermal expansion coefficient; and the flexural strength decreases as the aging environmental pH value increases.

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Periodical:

Key Engineering Materials (Volumes 512-515)

Pages:

770-774

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.770

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Online since:

June 2012

Authors:

Hui Yang, Hong Sheng Zhao, Zhong Guo Liu, Zi Qiang Li, Kai Hong Zhang

Keywords:

Aging pH Value, Coat-Mix Process, Crosslink Degree, Porous Silicon Carbide Ceramic

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