Vol.4 No.6 (November 2014)
Thermal Property and Ceramic Mechanism of
In this paper, methyl vinyl Phenyl Polysiloxane rubber (PVMQ) ablative composite filled with mica and silicone oxide was prepared. Its thermal properties were tested by TG-DSC analysis from room temperature to 1000˚C. After it was fired at different temperatures, the products were analyzed by Fourier transform infrared spectrometer and X-ray diffraction. The results showed that when the addition of mica was 40, the residual rate at 1000˚C was 66.21%. When the temperature was above 600˚C, the filler and organic silicon rubber started to transform from organic to inorganic. As temperature rose, the extent of porcelain was gradually deepened. So the ceramic mechanism of the composite could be described that the silicon oxide decomposed from silicon rubber reacted with mica. Then eutectic mixture which had a bridge effect was formed at the edge of fillers and the ceramic products were obtained when cooled down.
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