A kind of preparation method of SIC whisker toughened mullite anti-oxidation coating
An anti-oxidation coating, mullite technology, applied in the field of high-temperature anti-oxidation/anti-corrosion coating preparation, can solve the problems of complex preparation process, low efficiency, poor coating performance, etc.
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Embodiment 1
[0052] Preparation of SiC coating by embedding method: first, 180g Si powder, 90g SiC powder, 15g carbon powder, 15g Al 2 o 3 Put it in a ball mill jar and wet grind it at a speed of 200r / min for 24 hours, take it out, put it in a drying oven at 90°C for 12 hours, and then sieve it with a 60-mesh sieve to obtain the embedding powder.
[0053] Put the embedding powder into a graphite jar and embed the C / C matrix sample in the embedding powder, heat it to 1750°C in an argon atmosphere in a vacuum sintering furnace, keep it warm for 2 hours, and then cool it slowly to room temperature Take out the sample. The sample was ultrasonically cleaned with absolute ethanol and dried at 90°C for 2 hours to obtain a SiC coating-coated C / C composite sample.
[0054] Preparation of SiC whisker toughened mullite outer coating by sol-gel method: 1) Dissolve 10.4165g tetraethyl orthosilicate and 56.247g Al(NO3)3·9H2O in 14mL ethanol, add 1.800g glacial acetic acid Reflux for 4 hours under hea...
Embodiment 2
[0056] Preparation of SiC coating by embedding method: First, put 260g Si powder, 96g SiC powder, 40g carbon powder, 4g Al2O3 in a ball mill jar and wet grind it at a speed of 200r / min for 24h, then take it out, put it in a drying oven at 90°C Dry for 12 hours, and then sieve through a 60-mesh sieve to obtain the embedding powder.
[0057] Put the embedding powder into a graphite jar and embed the C / C matrix sample in the embedding powder, heat it to 1800°C in an argon atmosphere in a vacuum sintering furnace, keep it warm for 2 hours, and then cool it slowly to room temperature Take out the sample. The sample was ultrasonically cleaned with absolute ethanol and dried at 90°C for 2 hours to obtain a SiC coating-coated C / C composite sample.
[0058] Preparation of SiC whisker toughened mullite outer coating by sol-gel method: 1) Dissolve 41.666g of tetraethyl orthosilicate and 224.988g of Al(NO3)3·9H2O in 200mL of ethanol, add 30g of glacial acetic acid Reflux for 4 hours und...
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