Quartz fiber reinforced silica ceramic composite material densification method
A technology of composite materials and quartz ceramics, which is applied in the field of inorganic materials, can solve the problems of weak interlayer bonding and high porosity, and achieve the effects of increasing density and compressive strength, facilitating implementation, and scientific and reasonable preparation methods
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Embodiment 1
[0032] (1) Preparation of impregnation solution
[0033] Weigh 384g of high hydrogen-containing silicone oil, 2.88g of TEOS, 38.4g of deionized water, 2.88g of organotin catalyst and 15.36g of quartz powder, stir in a water bath at 35°C for 6 hours, and the viscosity is 186mPa·s, ready to use.
[0034] (2) Densification treatment
[0035] Immerse the quartz fiber (needle-punched structure) reinforced quartz ceramic composite material sample dried to constant weight in the prepared immersion solution, and vacuum treatment for 30 minutes (vacuum degree -0.08MPa). Then put the sample and impregnating solution together in a constant temperature and humidity drying box at 30°C, continue to immerse for 4 hours, then raise the temperature to 160°C for gel curing, and the curing time is 10 hours. Clean the surface of the treated sample and conduct relevant performance tests.
[0036] The sample prepared by this process: the bulk density can be increased by 16.9%; the compressive str...
Embodiment 2
[0038] (1) Preparation of impregnation solution
[0039] Weigh 400g of high hydrogen-containing silicone oil, 4.8g of TEOS, 20g of deionized water, 0.08g of nickel acetate catalyst, and 10.00g of quartz powder, stir in a water bath at 40°C for 4 hours, and the viscosity is 173mPa·s, ready to use.
[0040] (2) Densification treatment
[0041] Immerse the quartz fiber (needle-punched structure) reinforced quartz ceramic composite material sample dried to constant weight in the prepared immersion solution, and vacuum treatment for 30 minutes (vacuum degree -0.10MPa). Then put the sample and impregnating solution together in a constant temperature and humidity drying box at 60°C, continue to immerse for 2 hours, then raise the temperature to 220°C for gel curing, and the curing time is 14 hours. The solidified sample was placed in a muffle furnace for heat treatment at 300°C, cooled naturally to room temperature, and then the surface of the sample was cleaned and related performa...
Embodiment 3
[0044] (1) Preparation of impregnation solution
[0045] Weigh 200g of high hydrogen-containing silicone oil, 6.0g of TEOS, 20g of deionized water, 1.20g of organotin catalyst and 8.00g of quartz powder, stir in a water bath at 40°C for 5 hours, and the viscosity is 200mPa·s, ready to use.
[0046] (2) Densification treatment
[0047] Immerse the quartz fiber (needle-punched structure) reinforced quartz ceramic composite material sample dried to constant weight in the prepared immersion solution, and vacuum treatment for 30 minutes (vacuum degree -0.08MPa). Then put the sample and impregnating solution together in a constant temperature and humidity drying box at 50°C, continue to immerse for 6 hours, then raise the temperature to 200°C for gel curing, and the curing time is 12 hours. The cured sample was placed in a muffle furnace for heat treatment at 500°C, cooled naturally to room temperature, and then the surface of the sample was cleaned and related performance tests we...
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