Carbon-carbon/aluminium composite material preparation method
An aluminum composite material and aluminum liquid technology, which is applied in the field of carbon-carbon/aluminum composite material preparation, can solve the problems of difficult preparation of prefabricated parts and difficult control of interface reaction
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example 1
[0018] Example 1. Preparation of needle felt carbon-carbon / aluminum composites
[0019] First, several layers of integral felts with a thickness of 0.2 to 2 cm are stacked, connected as a whole by needle punching, and the designed fiber volume content is reached, carbonized at 1050°C, and then processed by chemical vapor infiltration to make a needle felt. Carbon-carbon preform; then composited with aluminum using a vacuum pressure infusion process to form a carbon-carbon / aluminum composite. Among them, the carbon fiber volume content is 6%, the pyrolytic carbon volume content is 17%, and the others are aluminum matrix.
[0020] The structure of the needle felt carbon-carbon / aluminum composite material is as follows: the fibers in the plane of the preform are distributed randomly, and the proportions in each direction are roughly equal, so that the properties of the produced material are in-plane isotropic. The carbon fibers in the prefabricated parts are all wrapped in a py...
example 2
[0023] Example 2. Preparation of carbon felt carbon fiber laminate carbon-carbon / aluminum composite material
[0024] First of all, T300 carbon fibers with a design thickness are laid in one direction on the single-layer integral felt, and 2 to 20 layers of integral felts with carbon fibers laid on the surface are stacked to form a sandwich structure of carbon fiber-carbon felt-carbon fiber. After the structure is cross-linked into a whole by needle punching and reaches the designed initial density; carbonization treatment is carried out at 1050°C, and finally carbon fiber carbon felt laminate carbon-based skeleton material is made by chemical vapor infiltration. Then adopt the die casting method, under the pressure of 10MPa, the preheating temperature of the preform is 450°C, the temperature of the aluminum liquid is 800°C, the mold temperature is 300°C, the pressure of the press is 10MPa, and the pressure is maintained for 1 minute. After cooling, carbon felt and carbon fibe...
example 3
[0027] Example 3. Preparation of unidirectional carbon fiber reinforced carbon-carbon / aluminum composite material
[0028] After the T300 carbon fiber is laid in one direction in the graphite mold to the designed volume content, pyrolytic carbon is deposited on the surface of the fiber through chemical vapor infiltration, and the aluminum liquid is infiltrated into the preform by vacuum pressure impregnation process, and the carbon-carbon preform is packed Put it into a steel mold, seal the mold and put it into the heating furnace, the upper furnace body and the lower furnace body are heated up separately, the temperature of the closed tank and the molten aluminum reaches 750°C, and the furnace is vacuumed, when the vacuum degree is 1×10 -6 MPa, lift up the crucible containing the aluminum liquid, immerse the sealed mold mouth with the preform into the aluminum liquid, and then pass nitrogen into the furnace with a pressure of 1×10 6 MPa, under the action of the pressure diffe...
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