A kind of high thermal conductivity c/sic composite material and preparation method thereof
A composite material and high thermal conductivity technology, which is applied in the field of high thermal conductivity C/SiC composite materials and its preparation, can solve the problems of thermal stress deformation of components, difficulty in maintaining aerodynamic shape of components, and harsh aerodynamic thermal environment.
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[0021] The invention provides a method for preparing a high thermal conductivity C / SiC composite material, comprising the following steps:
[0022] (1) Deposit and graphitize the carbon cloth and the gaseous carbon source in sequence to obtain a two-dimensional carbon cloth;
[0023] (2) Coating the adhesive and the matrix suspension onto the two-dimensional carbon cloth in sequence, and performing non-melting treatment to obtain a prefabricated body;
[0024] (3) Sintering the preform to obtain a low-density material;
[0025] (4) Densifying the low-density material to obtain the high thermal conductivity C / SiC composite material.
[0026] In the present invention, the specification of the carbon cloth in the step (1) is preferably 1-12K mesophase pitch-based carbon fiber, more preferably 3-10K mesophase pitch-based carbon fiber, more preferably 5-8K mesophase pitch-based carbon fiber The heat treatment temperature of the mesophase pitch-based carbon fiber is preferably 600...
Embodiment 1
[0051] The 1K mesophase pitch-based twill carbon cloth heat-treated at 600°C was placed in a chemical vapor deposition furnace, methane gas was introduced, the deposition pressure was set at 5kPa, the deposition temperature was set at 800°C, the deposition time was 6h, and the gas flow rate was 300mL / min, to obtain a mesophase pitch-based twill carbon cloth containing a pyrolytic carbon interface, and then place it in an induction graphitization furnace under the protection of high-purity argon, and perform graphitization at 2800°C to form a C / C framework to obtain a two-dimensional carbon cloth.
[0052] Weigh 70g of flake graphite with a particle size of 50μm, 65g of SiC powder with a particle size of 100nm, 1800g of zirconia balls with a particle size of 0.2mm, and 900g of zirconia balls with a particle size of 2mm and put them into a ball mill jar for ball milling at 300rpm Ball milling at a rotating speed of 20 hours to obtain a graphite / silicon carbide composite powder,...
Embodiment 2
[0062] Put the 2K mesophase pitch-based non-woven cloth heat-treated at 800°C in a chemical vapor deposition furnace, feed propylene gas, set the deposition pressure to 8kPa, set the deposition temperature to 900°C, set the deposition time to 8h, and the gas flow rate to 400mL / min, to obtain a mesophase pitch-based non-woven fabric containing pyrolytic carbon interface, and then place it in an induction graphitization furnace under the protection of high-purity argon, and perform graphitization treatment at 2900 ° C to form a C / C framework to obtain a two-dimensional carbon cloth.
[0063] Weigh 120g of flake graphite with a particle size of 80μm, 60g of SiC powder with a particle size of 120nm, 3600g of zirconia balls with a particle size of 0.2mm, and 1800g of zirconia balls with a particle size of 2mm and put them into a ball mill jar for ball milling at 400rpm Ball milling at a rotating speed of 24 hours to obtain a graphite / silicon carbide composite powder, which was add...
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Abstract
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