Silicon-oxygen-carbon ceramic products and preparing method thereof

Abstract

The invention discloses a siloxicon ceramic part product and a process for preparation thereof. The process employs organosiloxane as ceramic precursor, and another organosiloxane precursor as a forming die, shaping organosiloxane ceramic precursor and preparing molded siloxicon ceramic parts via crosslinking, solidifying and pyrolising. The employed organosiloxane ceramic precursor is an organicmonomer or polymer containing Si-O main chains or a skeletal structure. A molding material precursor of organosiloxane ceramic precursor is one component which contains polysiloxane of at least two alkenyls per molecule. The other component contains at least two poly-organo-hydrogen-siloxanes hydrogen atoms of which are bound to the same silicon atoms or to different silicon atoms. The invention has the advantages that the ceramic precursor and the molding material are all siloxane, which can be perfectly wet and have the similar thermal expansions, thereby meeting the requirement of the precursor on molding accuracy and avoiding the problem of cracking of shaped bodies. Siloxicon ceramics with complex shapes can be accurately prepared, in particular to preparing tiny siloxicon ceramic parts and patterns.

Description

technical field [0001] The invention belongs to the field of ceramic preparation, in particular to a silicon oxide carbon ceramic product and a preparation method thereof, in particular to the preparation of silicon oxides that can be applied in related fields such as advanced materials, electronics, information, sensors, micro-electromechanical systems, and mechanical systems. Oxygen carbon ceramics. Background of the invention [0002] Silicon oxygen carbon 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 fields, chemical engineering, electronics, and mechanical processing. Silicon carbon ceramics can be formed by cross-linking, curing and pyrolysis of liquid polymer precursors, and can be liquid-phase molded to prepare complex-shaped ceramic bodies, especially high-precision molded bodies, and small and complex ...

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Problems solved by technology

[0005] Chinese patent CN101074159A discloses a method for synthesizing dense silicon carbon ceramics from liquid polysiloxane, but not preparing silicon carbon ceramic products with complex shapes

Usually, during the molding and cross-linking curing process of the liquid phase precursor, it is difficult for the molded and cured ceramic precursor to wet the mold material and reach the sharp corner of the mold material, which seriously affects the molding quality of the ceramic precursor, especially in the It becomes a serious obstacle in the case of high forming precision and high resolution required for the preparation of tiny ceramic parts and patterns

At the same time, due to the thermal mismatch between the precursor and the mold material, the difference in modulus leads to cracking of the solidified ceramic precursor, which affects the preparation of the molded ceramic body.

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