Repairing method of SiC/SiC ceramic-based composite material
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A composite material and repair method technology, which is applied in the repair field of ceramic matrix composite materials, can solve problems such as catastrophic damage, decline in high-temperature oxidation resistance of ceramic matrix composite materials, failure and damage of components, etc., and achieve the effect of improving oxidation resistance
Active Publication Date: 2018-05-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0003] The main application fields of SiC/SiC are often related to high-temperature environment, which may affect the occurrence and evolution of subsequent oxidation damage. In addition to the thermal mismatch cracks generated during the preparation process, SiC/SiC will also suffer from high-temperature oxidation d
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Embodiment 1
[0021] (1) Grinding the surface of the sample, cleaning and drying;
[0022] (2) Clean the fracture of the SiC / SiC ceramic matrix composite material sample, corrode it with HF with a mass fraction of 11% for 30 minutes, and then clean and dry it;
[0023] (3) ultrasonically clean the corroded sample in deionized water for 20 minutes, and dry;
[0024] (4) Preparation of Ni(NO 3 ) 2 Catalyst solution, the mass fraction of the catalyst is 0.5%, put the dried SiC / SiC ceramic matrix composite material into the catalyst solution for 25 hours, and vacuum dry;
[0025] (5) Wrap the dried sample in (4) with graphite paper so that only the fracture is exposed, put it into a vacuum furnace, and inject trichloromethylsilane, H 2 and Ar, trichloromethylsilane, H 2 The ratio of Ar and Ar is 1:1:2, the temperature is 800°C, the pressure is 500Pa, the time is 20h, and then trichloromethylsilane and H 2 , heat up to 1300°C, keep warm for 60min;
[0026] (6) Close Ar, pass into NH 3 、BC...
Embodiment 2
[0032] (1) Grinding the surface of the sample, cleaning and drying;
[0033] (2) Clean the fracture of the SiC / SiC ceramic matrix composite material sample, corrode it with HF with a mass fraction of 11% for 40 minutes, and then clean and dry it;
[0034] (3) Place the corroded sample in deionized water for ultrasonic cleaning, the cleaning time is 40min, and dry;
[0035] (4) Preparation of Ni(NO 3 ) 2 Catalyst solution, the mass fraction of the catalyst is 1.0%, put the dried SiC / SiC ceramic matrix composite material into the catalyst solution and soak for 20h, and vacuum dry;
[0036] (5) Wrap the dried sample in (4) with graphite paper so that only the fracture is exposed, put it into a vacuum furnace, and inject trichloromethylsilane, H 2 and Ar, trichloromethylsilane, H 2 The ratio of Ar and Ar is 1:3:4, the temperature is 1100°C, the pressure is 600Pa, the time is 10h, then trichloromethylsilane and H 2 , heat up to 1600°C, keep warm for 30min;
[0037] (6) Close ...
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Abstract
A repairing method of a SiC/SiC ceramic-based composite material comprises the following steps: polishing the surface of a test sample, cleaning and drying, corroding the test sample by HF, cleaning and drying, ultrasonically cleaning, drying and soaking into a catalyst solution prepared from iron, cobalt or nickel, performing vacuum drying, wrapping the test sample with graphite paper and only exposing a fracture; and putting the test sample into a vacuum furnace, introducing methyltrichlorosilane, H2 and Ar, preserving heat for 5 to 20 hours, closing methyltrichlorosilane and H2, preservingheat for 10 to 100 minutes, closing Ar, introducing NH3, BCl3, H2 and N2, preserving heat for 5 to 20 hours, closing NH3 and BCl3, introducing methyltrichlorosilane and H2, preserving heat for 50 to 300 hours, taking out the test sample, removing the graphite paper, polishing and repairing the surface, putting the treated sample into the vacuum furnace, introducing methyltrichlorosilane, H2 and Ar, preserving heat for 5 to 30 hours, and spray-coating a composite coating consisting of yttrium silicate and mullite by a plasma spray-coating method. Main injury that the SiC/SiC composite materialis liable to generate can be repaired, the material composition is not changed after repairing, and the anti-oxidation property of the material under the high-temperature environment is improved.
Description
technical field [0001] The invention relates to a repair method of a ceramic matrix composite material, in particular to a repair method of a SiC / SiC ceramic matrix composite material. Background technique [0002] SiC / SiC ceramics are the most ideal new-generation high-temperature structural materials in the fields of aerospace and atomic energy. It is applied to the structural components of aerospace engines, can be used at ultra-high temperatures, has low density and high strength, and can significantly increase the thrust-to-weight ratio of the engine. It is used as a reactor wall material for atomic energy reactors, which has good stability, easy maintenance, safety and reliability. high. Therefore, many countries have carried out research on the application of materials to high-temperature thermal structural components, and achieved fruitful results. [0003] The main application fields of SiC / SiC are often related to high-temperature environment, which may affect th...
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Application Information
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