Manufacturing method of ceramic composite material, and product thereof

Abstract

The invention discloses a manufacturing method of a ceramic composite material, and a product thereof. The manufacturing method comprises the following steps: selecting silicon carbide (SiC) powder with a specific particle length-diameter ratio and particle size as selected silicon carbide raw material powder; coating the surface of a silicon carbide (SiC) powder individual with a PVA coating layer through a diffusion type high-speed granulation process, and combining selected silicon carbide raw material powder and PVA to form a particulate ceramic raw material; pressing the particulate ceramic raw material into a base material green body through a pressure forming process; sintering and shaping the ceramic base material green body, and cooling to prepare a continuous pore channel of which the interior is completely communicated with the surface; and placing the ceramic base material green body into a same-type mold with a reserved surface thickness, heating the mold to a constant temperature state, and performing high-speed and high-pressure infiltration of molten aluminum into the ceramic base material green body for die-casting formation, so as to complete the ceramic composite material. According to the manufacturing method, the grain shapes of silicon carbide (SiC) powder individuals are kept complete, the silicon carbide (SiC) powder individuals subjected to pressure forming can generate a bridging effect through mutual felt adhesion of PVA to form continuous pores, the dosage of PVA is far lower than that of traditional wet granulation, the product has the advantages of being high in porosity and specific surface area, improving the strength of a green body and being environmentally friendly, and meanwhile, the aluminized ceramic composite material can achieve the effects of light weight, high rigidity, high toughness, low expansion coefficient, high stability and high thermal conductivity.

Description

technical field [0001] The invention relates to the technical field of ceramic composite materials, in particular to a method for manufacturing a ceramic composite material with light weight, high heat conduction performance, high rigidity, high toughness and low expansion coefficient and its products. Background technique [0002] At present, porous silicon carbide (SiC) ceramics have been widely used due to their excellent high-temperature strength, chemical stability, good thermal shock resistance and oxidation resistance, etc. The SiC material is a crystalline powder that is a non-metallic material, and there are no free electrons in the crystal structure, so it has excellent insulation. The heat transfer of SiC belongs to the phonon heat conduction mechanism. When the crystal lattice is complete and free of defects, the larger the mean free path of phonons is, the higher the thermal conductivity will be. SiC ceramic heat sink is resistant to cold and heat shock, not ea...

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Problems solved by technology

[0010] According to the currently known lightweight and high thermal conductivity ceramic composite materials, it is mainly made by the gravity casting infiltration method, that is, after the ceramic sheet is heated to about 1000 ° C, the heated ceramic sheet is placed in the gravity casting infiltration mold , and introduce aluminum water into the mold for die-casting; due to the above-mentioned uncertainties and deficiencies in the traditional ceramic substrate manufacturing method, the stability of the processing process is poor and the yield of the finished product is extremely low, so there is an improvement the necessity of

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