Preparation method of silicon-magnesium ceramic based complex fiber
A ceramic matrix composite and fiber technology is applied in the field of ceramic composite materials, which can solve the problems of poor compactness and poor mechanical properties, and achieve the effects of improving mechanical properties, increasing the degree of densification, and improving the stability of fiber formation.
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example 1
[0025] First take 40g tetraethyl orthosilicate, 5g carboxymethyl cellulose, add it to 1L ethanol solution with a mass fraction of 70%, and stir at 300r / min for 20min to obtain reaction solution A; then take 4g magnesium acetate, 3g citric acid, and 18g glucose , add 1L of deionized water, stir at 300r / min for 20min, then adjust the pH to 5.0 with 10% ammonia water to obtain reaction solution B; then mix reaction solution A and reaction solution B evenly and place in a vacuum drying oven , at 1kPa, stand still for 1h to obtain impregnating solution; take 10g of carbon fiber fabric and impregnating solution into a hydrothermal reaction kettle, conduct homogeneous hydrothermal treatment at 180°C for 6h, cool to room temperature and filter to obtain filter residue, put the filter residue in In a drying oven, dry to constant weight at 60°C to obtain a ceramic matrix composite fiber precursor; finally, put the ceramic matrix composite fiber precursor into a high-temperature vacuum fu...
example 2
[0027] First take 60g tetraethyl orthosilicate and 8g carboxymethyl cellulose, add it to 2L ethanol solution with a mass fraction of 70%, and stir at 350r / min for 25min to obtain reaction solution A; then take 6g magnesium acetate, 5g citric acid, and 27g glucose , add 2L deionized water, stir at 350r / min for 25min, then adjust the pH to 5.3 with 10% ammonia water to obtain reaction solution B; then mix reaction solution A and reaction solution B evenly and place in a vacuum drying oven , under 6kPa, stand still for 2h to obtain impregnating solution; take 15g of carbon fiber fabric and impregnating solution into a hydrothermal reaction kettle, conduct homogeneous hydrothermal treatment at 200°C for 7h, cool to room temperature and filter to obtain filter residue, put the filter residue in In a drying oven, dry at 70°C to constant weight to obtain a ceramic matrix composite fiber precursor; finally, put the ceramic matrix composite fiber precursor into a high-temperature vacuum...
example 3
[0029] First take 80g tetraethyl orthosilicate, 10g carboxymethyl cellulose, add it to 2L ethanol solution with a mass fraction of 70%, and stir at 400r / min for 30min to obtain reaction solution A; then take 8g magnesium acetate, 6g citric acid, and 36g glucose , add 2L of deionized water, stir at 400r / min for 30min, then adjust the pH to 5.5 with 10% ammonia water to obtain reaction solution B; then mix reaction solution A and reaction solution B evenly and place in a vacuum drying oven , under 10kPa, let it stand for 2 hours to obtain the impregnating liquid; take 20g of carbon fiber fabric and impregnating liquid and put them into a hydrothermal reaction kettle, conduct a homogeneous hydrothermal treatment at 220°C for 8 hours, and filter to obtain a filter residue after cooling to room temperature. In a drying oven, dry at 80°C to constant weight to obtain a ceramic matrix composite fiber precursor; finally, put the ceramic matrix composite fiber precursor into a high-tempe...
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