One-way high-heat-conductivity Cf/Al composite material preparing method

Abstract

The invention relates to a one-way high-heat-conductivity Cf/Al composite material preparing method. An aluminum wire is utilized for fixing a rough and flat high-heat-conductivity mesophase pitch base carbon fiber continuous filament into one-way cloth, physical vapor deposition is utilized for conducting aluminum plating treatment on the high-heat-conductivity mesophase pitch base carbon fiber one-way cloth, a layer of aluminum film exists on the surface of the carbon fiber, and the carbon fiber one-way cloth pre-deposited material is prepared. The carbon fiber one-way cloth pre-deposited material and aluminum powder are subjected to laminating vacuum hot press, the volume fraction of the prepared high-heat-conductivity carbon fiber composite material fiber is controlled within 15-35%, the heat conductivity of the composite material in the fiber direction is 300-650 W/m.K, and the high-heat-conductivity Cf/Al composite material can be welded to an aluminum material water-cooling plate and is a heat management material with good application prospects. Usage of heat conduction paste and other heat interface materials can be avoided, and compared with ordinary heat diffusion material devices, the heat conduction capability is greatly improved. Due to the fact that the aluminum film exists in the surface of the carbon fiber, densifying of the high-heat-conductivity Cf/Al composite material can be achieved with the low pressure.

Description

technical field [0001] The invention relates to a unidirectional high thermal conductivity C that can be used for an optical fiber cladding power stripper f / Al composite preparation method. Background technique [0002] High-power fiber lasers and amplifiers have the characteristics of high beam quality, good heat dissipation, easy miniaturization, and low operating costs. They gradually replace traditional high-power lasers and become a new generation of lasers in industrial processing and other fields. In order to ensure the quality of the spot, the fiber laser needs to strip off the residual light in the fiber that is not absorbed by the doped core. At this time, the residual light inevitably leaks on the thermal management material and undergoes photo-thermal conversion. If the temperature of these hot spots is too high, it will cause damage to the fiber structure. Therefore, a heat management material is needed to conduct the accumulated heat generated by the light l...

AI Technical Summary

Problems solved by technology

The thermal conductivity of aluminum is about 200W / m·K, and its thermal conductivity cannot meet the demand for higher power; while other materials with higher thermal conductivity, such as lightweight high thermal conductivity graphite materials, etc., the interface between the aluminum heat sink and the High thermal resistance requires the use of thermal interface materials such as thermal paste with low thermal conductivity, which reduces the rate of heat conduction and limits the further increase of laser power

Adding continuous high thermal conductivity carbon fiber into aluminum can improve the thermal conductivity of thermal management components in a specific direction, but in the current mature liquid impregnation and pressure infiltration, the chemical reaction between carbon fiber and aluminum at high temperature causes carbon fiber damage and The deterioration of the interface performance greatly limits the high thermal conductivity C f / Al composite material application; while improving C f The fraction of carbon fiber in / Al composites is difficult, and the improvement of thermal conductivity is limited

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