Carbon content controllable silicon-containing ceramic and preparing method thereof

The invention provides siliceous ceramics with controllable carbon content and a process for preparation, namely organosilane precursors pyrolyzed to be ceramics in the circumstance containing aqueous vapor. The percentage by weight of carbon content is 1-15%. The organosilane precursors comprising organic polymer employing Si-O, Si-N or Si-C as backbone chains or a skeletal construction is heated at a temperature of 600DEG C-1500DEG C and the productivity of ceramics is at least organosilane precursors of 50%. The organosilane precursors can be one or multiple mixture. Water can effectively react with carbon-containing groups and free carbon in the pyrolising process of the precursors, thereby avoiding simple substance carbon depositing in the precursor ceramics to form free-carbonless precursor ceramic material. By the time when increasing yield, the invention can restrain blocks cracking. The invention is a process for synthesizing low carbon ceramics, which can increase the property of the materials.