Method for machining and preparing copper anti-scale micro-nano composite structure layer by electric spark

Abstract

The invention discloses a method for machining and preparing a copper anti-scale micro-nano composite structure layer by electric spark. The method comprises the steps that a copper block is installedon an electric spark molding machine fixture, and the sufficient contact of the copper block and the fixture is guaranteed; the spraying direction of an electric spark machining liquid spraying mouthis adjusted to point to the surface of the copper block and form an angle range of 2-15 degrees with the surface of the copper block, and electric spark machining parameters are set; and an electricspark molding machine is started to machine the surface of the copper block, the machining depth is 1-2 mm, macroscopic electrical erosion characteristic structures are evenly distributed on the surface of the copper block, and the copper anti-scale micro-nano composite structure layer is obtained. The method for machining and preparing the copper anti-scale micro-nano composite structure layer bythe electric spark is simple and efficient, the copper anti-scale micro-nano composite structure layer can be prepared by only one machining procedure, an electric spark machining liquid can be recycled, the pollution of machining waste liquids to the environment is reduced, and the additional cost caused by treatment of the waste liquids is lowered.

Description

technical field [0001] The invention relates to the field of material surface engineering, in particular to a method for preparing a copper anti-scaling micro-nano composite structure layer by electric discharge machining. Background technique [0002] Copper-based materials are used as the heat exchange surface material, and the heat exchange medium is generally tap water or industrial water, which is easy to generate scale on the heat exchange surface, which reduces the heat exchange efficiency of the heat exchange surface, and the chemical composition of the scale will corrode the attachment area and shorten the exchange rate. service life of thermal equipment. [0003] In recent years, researchers have developed various anti-scaling coatings and their preparation technologies according to the characteristics of scale, and systematically studied the anti-scaling mechanism. The amount of adhesion to achieve surface anti-fouling. Common surface antifouling coating prepara...

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Problems solved by technology

However, the anti-scaling coating prepared by chemical method is affected by the preparation method, and its shortcomings are also obvious: first, because the heat exchange interface is the concentrated area of ​​heat exchange effect, the coating is affected by the bubble vibration and heat flow exchange generated during the boiling heat transfer process , the bonding force between the coating and the substrate is greatly reduced, which directly affects its service life, and the peeled coating is mixed in the heat exchange medium to cause pollution and secondary fouling hazards; secondly, the composition of the anti-fouling coating affects the heat exchange effect Some anti-scaling coatings use polymer materials as one of their components. The thermal conductivity of polymer materials is not as good as that of metal materials and some non-metallic materials, which reduces the heat transfer effect of this type of anti-scaling coating. Good anti-fouling performance, but the heat transfer efficiency cannot meet the needs of working conditions

At the same time, the preparation of surface antifouling coatings by chemical methods is also affected by the scale of preparation and environmental pollution, the corresponding preparation costs are high, and large-scale industrial production is limited

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