A kind of preparation method of cf/sic-zrc-zrb2 ultra-high temperature ceramic matrix composite material
A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of anti-oxidation and mechanical properties, and improving the ablation resistance of materials. It can solve the problems of low phase content and uneven distribution of ultra-high temperature ceramics, and achieve the purpose of improving the content and distribution of ultra-high temperature phases. Uniform, comprehensive performance-enhancing effect
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Embodiment 1
[0054] (1) Prefabricated body treatment: carry out alcohol ultrasonic cleaning on the carbon fiber prefabricated body (the interface is a PyC / SiC composite multilayer interface with a thickness of 500nm) with an open porosity of 30vol%, and the cleaning time is 2 hours;
[0055] (2) Preparation of sol solution: H 3 BO 3 , PVA were dissolved in glycerin and deionized water respectively, and 8.0mol / L H 3 BO 3 solution and 2.0mol / L PVA solution, with NH 3 ·H 2 O solution to H 3 BO 3 The pH of the solution was adjusted to 4, and the two solutions were mixed in a molar ratio of H 3 BO 3 / PVA=4 / 10 ratio mixing, reacting at 80°C oil bath temperature for 4-8 hours to obtain a sol solution;
[0056] (3) Vacuum impregnation sol: under the vacuum condition of -0.08MPa~-0.10MPa, introduce the sol solution in (2) into the C in (1) fIn the preform, heat it at 100°C for 24 hours to obtain C f / polyethyl borate, take it out and put it in an oven to dry at 60°C for 48 hours;
[0057...
Embodiment 2
[0063] Similar to the steps in Example 1, the difference is that the open porosity of the fiber preform is 40% (the interface is a PyC / SiC composite multilayer interface with a thickness of 1000nm), H 3 BO 3 The pH of the solution was adjusted to 5, the molar ratio H 3 BO 3 / PVA=5 / 10, the temperature of the sol-oil bath is 100°C, the gel condition is 110°C for 20 hours, and the gel is dried at 70°C for 36 hours.
Embodiment 3
[0065] Similar to the steps in Example 1, the difference is that the open porosity of the fiber preform is 50% (the interface is a PyC / SiC composite multilayer interface with a thickness of 1500nm), H 3 BO 3 The pH of the solution was adjusted to 6, the molar ratio H 3 BO 3 / PVA=6 / 10, the temperature of the sol-oil bath is 120°C, the gel condition is 120°C for 18 hours, and the gel is dried at 80°C for 24 hours.
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