Aluminum material with enhanced nucleate boiling heat transfer function and preparation method thereof

Abstract

An aluminum material with enhanced nucleate boiling heat transfer function and a preparation method thereof. The surface of the novel aluminum material is distributed with several nanopores, and nano-protrusion structures are distributed on the top of the nano-pores, which are connected to each other at the nano-protrusion pores; The preparation method includes: taking the cathode and the anode mainly composed of aluminum and placing them in the electrolyte to form an oxidation system, and applying a gradually increasing oxidation voltage between the cathode and the anode, so that the formation and corrosion of alumina pores on the surface of the aluminum The degree is dynamically adjusted with the change of time, voltage and current, and the local over-corrosion of the channel and the hole wall at the top of the hole is realized in one step, forming the above-mentioned composite array structure. The product has super-hydrophilic properties, which can rapidly detach the bubbles while greatly increasing the effective nucleation sites of the bubbles, thereby improving the nucleate boiling heat transfer performance of aluminum materials. The invention has simple process, short production period and is beneficial to large-scale production.

Description

technical field [0001] The invention particularly relates to a nanoporous structure on the surface of an aluminum material and a preparation process thereof, belonging to the field of material science. Background technique [0002] With the rapid development of industries such as electronic information and new energy and cutting-edge science and technology (such as supercomputers, nuclear power, large chemical reactors, lasers, and radars), the integration and heat production of devices have increased sharply, so it can be used in a limited and small space. Nucleate boiling heat transfer technology, which realizes efficient transfer of heat energy to ensure stable operation of the system, has attracted widespread attention. Nucleate boiling heat transfer is an efficient heat transfer method. This technology is based on the absorption of a large amount of latent heat during the transition from liquid phase to gas phase at the superheated interface to achieve efficient heat tr...

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Problems solved by technology

However, due to the limitations of processing technology, pressure welding (application number 93112898.6), paint brush coating (publication number CN 101505892A, publication number CN 1730204A), powder sintering (publication number CN 101315927A), flame spraying (application number 90109615.6) and other methods to build macroscopic and micron-scale porous and groove structures on the surface of aluminum to improve the boiling heat transfer performance of the aluminum surface, but to build nanoporous structures on the surface of aluminum to enhance the boiling of the aluminum surface Research on heat transfer performance has not been reported

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