Three-dimensional mesophase pitch-based carbon/carbon composite material with high heat conductivity and preparation technology thereof

Abstract

The invention relates to a three-dimensional mesophase pitch-based carbon / carbon composite material with high heat conductivity and a preparation technology thereof. The preparation technology comprises the following steps: firstly, by taking a mesophase pitch-based carbon fiber cloth with high heat conductivity as a reinforced body in the XY direction and a high-modulus carbon fiber as a reinforced fiber in the Z direction, preparing three-dimensional carbon fiber fabric with high heat conductivity by adopting a carbon cloth puncturing technology; secondly, by taking mesophase pitch as a precursor of matrix carbon, performing densifying treatment on the three-dimensional carbon fiber fabric with high heat conductivity by adopting a dipping / carbonizing technology; finally, performing graphitization treatment at a high temperature of 2800 DEG C above on the obtained materials, so as to obtain the three-dimensional mesophase pitch-based carbon / carbon composite material with high heat conductivity. Through the adoption of the technology method, the heat conductivity, modulus and dimensional stability of the carbon / carbon composite material are greatly improved, and the highest heat conductivity reaching 3600 w / mK of the material in the XY direction is increased by more than 5 times as compared with the common three-dimensional carbon / carbon composite material.

Description

technical field [0001] This patent relates to a three-dimensional mesophase pitch-based high thermal conductivity carbon / carbon composite material and its preparation process, which belongs to the technical field of carbon / carbon composite material manufacturing. Background technique [0002] High thermal conductivity carbon / carbon composite material with its excellent low density, high thermal conductivity, low expansion coefficient and unique high temperature high strength (can be applied in an oxygen-free or low-oxygen environment up to 3000 °C, and the material strength is from room temperature to 2000 °C Increase with temperature) and other properties have become the best candidate materials with high thermal conductivity at present, which are expected to replace traditional materials, occupy a leading position in the research and development of new thermal management and thermal dredging materials, and are widely used in national defense and electronics and other fields...

AI Technical Summary

Problems solved by technology

Domestic Shanxi Institute of Coal Chemical Industry, Beijing University of Chemical Technology, Central South University, and Institute of Aerospace Materials and Technology have carried out some related basic research work, and the prepared small-scale high thermal conductivity carbon / carbon composite materials are close to the level of foreign materials in terms of thermal conductivity, but Due to the limitation of raw materials, funds, etc., the research is limited to the laboratory level, and there is no related application

[0008] To sum up, a lot of work has been carried out in the preparation and application of high thermal conductivity carbon / carbon composites abroad, but there are few reports on the specific preparation process of high thermal conductivity carbon / carbon composites, and mesophase pitch is usually used as the matrix carbon. The high thermal conductivity carbon / carbon composite materials of the precursor are mostly limited to unidirectional or two-dimensional materials, and the preparation process usually adopts hot pressing molding. The materials and preparation process are relatively simple, and the process is difficult to scale up. , modulus and dimensional stability are poor

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