Preparation method of thin-walled c/sic extension
An extension section and thin-wall technology, which is applied in the field of thin-wall C/SiC extension section preparation, can solve the problems of complex manufacturing process, expensive materials, and poor high-temperature oxidation resistance of niobium alloys, so as to reduce quality, improve engine performance, The effect of reducing the production cost
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[0020] A method for preparing a thin-walled C / SiC extension, comprising the following steps:
[0021] 1) Lay up the carbon fiber cloth one by one, and prepare the extension section preform along the mandrel by sewing; the carbon fiber cloth for sewing is T300B-3K plain weave cloth, the yarn for sewing is carbon fiber T300B-6K, and the sewing distance is 2-4mm / needle;
[0022] 2) Put the prefabricated body of the extension section into the furnace, and carry out the degumming treatment. The degumming treatment temperature is 600-1100°C, the vacuum degree is -70--99KPa, and the time is 5-10h;
[0023] 3) Put the prefabricated body that has been degummed into a vapor deposition furnace for chemical vapor infiltration to 0.8-1.0g / cm 3 , The carbon source gas for chemical vapor deposition is methane or propylene, the purity of methane or propylene is above 99.99%, the deposition temperature is 800-1200°C, the pressure is -0.08-0.09MPa, and the time is 120-240h;
[0024] 4) Prepare...
Embodiment 1
[0033] 1) After laying the carbon fiber cloth T300B-3K plain weave cloth along the mandrel to reach 5mm, connect each layer of carbon fiber cloth into a whole by suturing to form an extension prefabricated body, and the sewing stitch distance is 3mm / needle;
[0034] 2) Put the prefabricated body of the extension section into the furnace, and carry out degumming treatment. The degumming treatment temperature is 800°C, the vacuum degree is -90KPa, and the time is 6h;
[0035] 3) Put the prefabricated body that has been degummed into a vapor deposition furnace for chemical vapor infiltration to 0.8g / cm 3 , the carbon source gas for chemical vapor deposition is methane, the deposition temperature is 1000°C, the pressure is -0.09MPa, and the time is 200h;
[0036] 4) Prepare a mixed solution A with polycarbosilane and divinylbenzene at a mass ratio of 1:0.5, and put the mixed solution A into a vacuum impregnation container A; then put the small end of the extension preform into the...
Embodiment 2
[0044] 1) After laying the carbon fiber cloth T300B-3K plain weave cloth along the mandrel to reach 5mm, connect each layer of carbon fiber cloth into a whole by suturing to form a prefabricated extension section, and the sewing stitch distance is 4mm / needle;
[0045] 2) Put the prefabricated body of the extension section into the furnace, and carry out the degumming treatment. The degumming treatment temperature is 900°C, the vacuum degree is -80KPa, and the time is 8h;
[0046] 3) Put the preform that has been degummed into a vapor deposition furnace for chemical vapor infiltration to 0.9g / cm 3 , the carbon source gas for chemical vapor deposition is methane, the deposition temperature is 1100°C, the pressure is -0.07MPa, and the time is 180h;
[0047] 4) Prepare a mixed solution A with polycarbosilane and divinylbenzene at a mass ratio of 1:0.6, and put the mixed solution A into a vacuum impregnation container A; then put the small end of the extension preform into the vacu...
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