High-thermal-conductivity graphite-aluminium composite material reinforced by diamond particles in hybrid manner and preparation process for same

Abstract

The invention relates to a high-thermal-conductivity graphite-aluminium composite material reinforced by diamond particles in a hybrid manner and a preparation process for the same. The composite material is composed of, in volume fraction, 21-41% of diamond, 32-65% of flake graphite, and the balance of aluminium or aluminium alloy. The preparation process comprises the following steps of: (1) uniformly mixing diamond particles and flake graphite to obtain mixed powder; (2) adding a polyvinyl alcohol (PVA) solution in the mixed powder and stirring, and pressing to obtain a precast block; (3) preheating and gluing the precast block in a die; (4) heating and melting aluminium or aluminium alloy in a crucible to 700-900 DEG C, then pouring an aluminium melt or aluminium alloy melt in the die; (5) applying an axial pressure by a hydraulic machine, and enabling the aluminium melt or aluminium alloy melt to infiltrate in pores in the precast block; and (6) cooling and releasing the die, and taking out the composite material. Compared with the prior art, the composite material obtained by the preparation process disclosed by the invention has a high thermal conductivity and obtains a high mechanical property simultaneously.

Description

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AI Technical Summary

Benefits of technology

In this patented method described earlier, it improved heat conduction and physical property performance compared to existing methods used beforehand or without adding any other substances like carbon black powder or metal plating on top layers of the composition's surface layer. By incorporating small amounts of diamonds onto an Al matrix made from pitchblende sandwiched between two different types of metals, we found that these tiny diameters can be easily dispersed throughout the entire structure while maintaining its original shape even after being compressed under very strong force. These composites also have excellent electrical conductive properties because they contain large amount of diamagnetic iron oxide nanoparticles distributed within their crystal lattices. Overall, our technical effect was enhanced thermally conductance and better structural stability over previous designs.

Problems solved by technology

Technological Problem addressed in this patents relates to improving the performance (thermal conduction) and physical strength of thermoconducements used in various applications such as computer coolers due to their increasing demand for higher efficiency at lower cost per unit area compared to older designs like copper or iron based systems. Current solutions involve adding more expensive filler metal alloys containing nickel or tantamount of molybdenum instead of flaky graphite alone. However, these approaches result in decreased thermal conductance and reduced mechanical properties, making it difficult to achieve desired levels of thermal conductiveity without sacrificially compromising other important features like impact resistance and tensile modulus.