Carbon content controllable silicon-containing ceramic and preparing method thereof

Abstract

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.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular silicon-containing ceramics with controllable carbon content and a preparation method. Background technique [0002] Silicon-containing ceramics have excellent properties such as low density, high temperature resistance, corrosion resistance, oxidation resistance, and electrical conductivity, and have important application prospects in high-tech, chemical, electronic, and mechanical processing fields. Organosilane precursors are generally polymers with silicon-carbon, silicon-oxygen, and silicon-nitrogen bonds as the backbone, and carbon-rich groups such as hydrocarbon groups or aromatic groups as side groups, such as organosilazane, siloxane, silcarbane, etc. The preparation of ceramics with it is generally carried out in an atmosphere such as inert argon, nitrogen or hydrogen. The resulting ceramics generally contain excess carbon. The chemical structure of the precursor is dif...

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Problems solved by technology

Previous studies mainly by changing the reaction conditions such as changing the pyrolysis atmosphere (N 2 or NH 3 ) and temperature, control the side chain group of the precursor, such as replacing Si-hydrocarbyl or Si-aryl with as many Si-H or Si-Si bonds as possible, or adding metal-containing organic salts or active fillers such as Ti, Al , B, etc., but these methods are not effective in avoiding the formation of excess carbon

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