A thermally conductive ceramic matrix composite material and its preparation method
A composite material and ceramic-based technology, which is applied in the field of preparation of thermally conductive ceramic-based composite materials, can solve the problems that the application effect of domestic high thermal conductivity carbon fiber is yet to be evaluated, the start is late, and the research on high thermal conductivity carbon fiber toughened composite materials is lagging behind. Improve high temperature oxidation ablation resistance, improve thermal conductivity, mechanical properties and good effect of braiding performance
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[0040] The invention provides a method for preparing a thermally conductive ceramic matrix composite material, such as figure 1 shown, including the following steps:
[0041] (1) Preparation of carbon fiber preform
[0042] The carbon fiber prefabricated body is woven by mixing mesophase pitch-based high thermal conductivity carbon fiber and polyacrylonitrile-based carbon fiber.
[0043] The mesophase high thermal conductivity carbon fibers used in this step can be selected from domestic or imported materials, and can also be prepared according to existing preparation methods (for example, using a preparation method comprising the following preparation steps: mesophase pitch synthesis, porous continuous melt spinning, Fiber continuous non-melting treatment, low / high temperature carbonization and graphitization treatment).
[0044] Due to the high tensile modulus of mesophase pitch-based high thermal conductivity carbon fibers, it is difficult to meet the requirements for mec...
Embodiment 1
[0078] (1) Preparation of carbon fiber preform
[0079] Mitsubishi Chemical K13D2U pitch-based high thermal conductivity carbon fiber is used for mixed weaving with Japanese Toray and Toho T300 traditional polyacrylonitrile-based carbon fiber. The weaving method is a three-way orthogonal method, and mesophase pitch-based high thermal conductivity carbon fiber is used in the incoming flow direction. Carry out weaving, see Table 1 for other weaving requirements, and weave according to fabric number 1 in Table 1 to obtain a carbon fiber prefabricated body. The fiber volume content and XY ratio of the fiber preform are shown in Table 1.
[0080] (2) Preparation of C / C body
[0081] Put the carbon fiber prefabricated body into the CVI-C furnace, the carbon source gas is propane, the carrier gas is argon, the deposition temperature is 1020°C, and the chemical vapor infiltration method is used for deposition, and the obtained density is 1.0g / cm 3 The C / C green body.
[0082] (3) i...
Embodiment 2
[0089] The preparation method is basically the same as that of Example 1, except that the weaving is carried out according to the fabric number 2 in Table 1.
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