Abstract
In recent years, extensive studies have been carried out on the synthesis of hybrid inorganic–organic polymers. An important group of these polymers are polyborosiloxanes which have gained importance as oxidation protection coating. Methylborosiloxane (BM) with ceramic residue 85% was synthesized from boric acid and methyltriethoxysilane in 1:2 ratio at 80–85 °C. The effect of carbon addition on the crystallization behaviour of BM was studied using pyrocarbon (PyC) as the carbon source. Ceramic conversion studies of the oligomers were carried out with and without carbon by pyrolysis at 900 °C followed by heat treatment at 1500 °C and 1650 °C in inert atmosphere. The oligomer gave an amorphous SiBOC ceramic at 1500 °C, but with increase in heat treatment temperature to 1650 °C, SiC crystallized out from the SiBOC matrix. With the increase in the PyC concentration, there was an enhancement in the formation of crystalline SiC.
Published Version
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