I can not find any evidence of silicone turning in to silica at temps under about 3000celsius AND in the corect atmosphere of oxides and impurities

Silica is an impure form of silicone oxides as in Sand, quartz, rock crystal, amethyst, agate, flint, jasper, and opal being some of the forms in which the oxide appears.

i severly doubt that the high temps and corect additives are present in our little glow engines, if you can tell me what you base your info on i'm happy to do some research