Carbon nanotube toughened sibcn(o) metal-based ceramic coating and its preparation method
A technology of ceramic coating and carbon nanotubes, which is applied in the field of SiBCN metal-based ceramic coating and its preparation, can solve the problems of high production cost and complexity, and achieve the effects of reducing energy consumption, improving toughness and simple process
Active Publication Date: 2020-01-17
国科广化(南雄)新材料研究院有限公司 +1
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Problems solved by technology
[0005] In order to avoid the deficiencies in the prior art, the primary purpose of the present invention is to provide a method for preparing a SiBCN(O) metal-based ceramic coating toughened by carbon nanotubes. The existing problems of complex process, high production cost and poor toughness improve the compactness of the ceramic coating, save costs and reduce energy consumption
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[0030] A preparation method of SiBCN(O) metal-based ceramic coating includes the following steps:
[0031] (1) Preparation of polyborosilazane
[0032] The Schlenk reaction flask was repeatedly evacuated and filled with high-purity argon at least three times to ensure that the air and moisture in the flask were completely drained. Then, 100ml of anhydrous tetrahydrofuran was added with a syringe, and then 10g of vinylchlorosilane and 1g of phenylchlorosilane were added. Pass in high-purity ammonia gas (99.9999%) at 0~10℃ for 2.5h, then react for 2h under argon protection; distill under reduced pressure to remove solvent to obtain viscous liquid polysilazane; under argon protection , 12.5ml of toluene solution (2M) of borane dimethyl sulfide was slowly added dropwise at 0°C. After the addition, the temperature was raised to room temperature, reacted for 24 hours, and distilled under reduced pressure to obtain polyborosilazane; the above operations were performed under inert gas Und...
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The invention discloses a carbon nano tube toughened SiBCN(O) metal-based ceramic coating and a preparation method thereof. The preparation method comprises the following steps: ammonolyzing vinyl chlorosilane and phenyl chlorosilane with ammonia, and then carrying out reaction for 1 to 3 hours; removing a solvent through evaporation, thus obtaining liquid polysilazane, and dropwise adding boranedimethyl sulfide for continuous reaction, thus obtaining polyborosilazane; dropwise adding a carbon nano tube solution into the polyborosilazane solution, and carrying out stirring, thus obtaining polymer slurry; coating the surface of a matrix with the slurry, and carrying out pyrolysis at high temperature to obtain the SiBCN(O) metal-based ceramic coating. According to the carbon nano tube toughened SiBCN(O) metal-based ceramic coating disclosed by the invention, the polyborosilazane synthesized by the vinyl chlorosilane, the phenyl chlorosilane and the borane dimethyl sulfide is used as a raw material, and carbon nano tubes are added to prepare the slurry; after immersion coating is carried out, high-temperature pyrolysis is carried out, thus obtaining the high-temperature-resistant andcorrosion-resistant ceramic coating. The process is easy to operate, and the sintering temperature is low; the energy consumption is reduced, and the cost is saved.
Description
Technical field [0001] The invention relates to a SiBCN(O) metal-based ceramic coating toughened by carbon nanotubes and a preparation method thereof. Background technique [0002] Every year, metal corrosion will cause huge economic losses. Ceramic coatings have been used as protective coatings due to their good wear resistance, corrosion resistance, high hardness, and high temperature resistance. However, traditional ceramic coating preparation methods such as CVD, PVD, sol-gel method, thermal spraying, etc. all require large-scale mechanical equipment, which consumes a lot of energy and costs. In recent years, the method of preparing coatings by pyrolyzing ceramic precursor polymers has attracted wide attention. [0003] SiBCN ceramics have good high temperature stability, oxidation resistance and suitable mechanical strength, and have good chemical compatibility with a variety of inorganic fiber reinforcements and ceramic matrixes. Studies have shown that this quaternary syst...
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IPC IPC(8): C04B35/80C04B35/58C04B35/622
Inventor 王斌冯颖
Owner 国科广化(南雄)新材料研究院有限公司