A kind of preparation method of high temperature resistant, oxidation resistant and thermally conductive graphene-based ceramic composite material
A technology of ceramic composite materials and thermally conductive graphite, which is applied in the field of graphene-based ceramic composite materials preparation, can solve the problems such as the difficulty in fully exerting the performance advantages of graphene, and the inability to effectively solve the problems of graphene and complex processes, so as to avoid oxidation, raw materials and other problems. The effect of low cost and simple process operation
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Embodiment 1
[0047] (1) Add 10 g of silica gel to 200 mL of fluorosilicic acid solution, stir for 20 hours to fully saturate the fluorosilicic acid solution, stop stirring, let stand for 30 min, and use a vacuum filtration system to filter out the silica gel in the fluorosilicic acid solution to obtain a clear A supersaturated solution of fluorosilicic acid, wherein the concentration of fluorosilicic acid is about 3.09 mol / L;
[0048]Dissolve 0.0095 g of boric acid powder in 60 mL of deionized water and stir evenly to obtain a boric acid solution; add 0.03 g of graphene to 49 mL of deionized water, and ultrasonically disperse it for 30 min to obtain a graphene solution; then ultrasonically mix the boric acid solution and the graphene solution evenly , get the mixture;
[0049] (2) Under the ultrasonic frequency of 48 kHz, 109 mL of the mixed solution was added dropwise to the supersaturated solution of 200 mL of fluorosilicic acid at a drop rate of 8 mL / min to obtain a precursor solution; ...
Embodiment 2
[0058] (1) Add 5 g of silica gel to 100 mL of fluorosilicic acid solution, stir for 18 hours to fully saturate the fluorosilicic acid solution, stop stirring, let stand for 30 min, and filter out the silica gel in the fluorosilicic acid solution using a vacuum filtration system to obtain a clear A supersaturated solution of fluorosilicic acid, wherein the concentration of fluorosilicic acid is about 3.09 mol / L;
[0059] Dissolve 0.0057 g of boric acid powder in 30 mL of deionized water and stir evenly to obtain a boric acid solution; add 0.01 g of graphene to 25 mL of deionized water, and ultrasonically disperse for 30 min to obtain a graphene solution; then ultrasonically mix the boric acid solution and the graphene solution evenly , get the mixture;
[0060] (2) under the ultrasonic frequency of 60kHz, drop 55mL of the mixed solution into the supersaturated solution of 100mL of fluorosilicic acid at a drop rate of 6mL / min to obtain a precursor solution;
[0061] (3) First p...
Embodiment 3
[0065] (1) Add 15 g of silica gel to 300 mL of fluorosilicic acid solution, stir for 24 hours to fully saturate the fluorosilicic acid solution, stop stirring, let stand for 30 min, and filter out the silica gel in the fluorosilicic acid solution using a vacuum filtration system to obtain a clear A supersaturated solution of fluorosilicic acid, wherein the concentration of fluorosilicic acid is about 3.09 mol / L;
[0066] Dissolve 0.0114 g of boric acid powder in 90 mL of deionized water and stir evenly to obtain a boric acid solution; add 0.06 g of graphene to 74 mL of deionized water, and ultrasonically disperse for 30 min to obtain a graphene solution; then ultrasonically mix the boric acid solution and the graphene solution uniformly , get the mixture;
[0067] (2) under the ultrasonic frequency of 40 kHz, drop 164 mL of the mixed solution into the supersaturated solution of 300 mL of fluorosilicic acid at a drop rate of 10 mL / min to obtain a precursor solution;
[0068] (...
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