A preparation method for forming a wear-resistant coating on the inner wall of an aluminum alloy cylinder

Abstract

The invention relates to a preparation method for forming a wear-resistant coating on the inner wall surface of an aluminum alloy cylinder, comprising the following steps: first uniformly mixing graphene powder, Al powder, etc. to obtain a mixed powder; mixing the above mixed powder with polyvinyl alcohol liquid Mix evenly and heat, and then spray granulate to obtain low-temperature self-propagating composite material; stir and mix low-temperature self-propagating composite material and water glass to obtain slurry; inject the slurry into the cylindrical inner cavity of the aluminum alloy workpiece, And the aluminum alloy workpiece is installed on the horizontal turntable to rotate, and the aluminum alloy workpiece is heated during the rotation process, so that the slurry is uniformly solidified on the inner wall surface of the cylindrical inner cavity; after the slurry is uniformly solidified, keep the rotating At the same time, the cured slurry is melted with an oxyacetylene flame, so that the cured slurry reacts to form a coating. The reaction process temperature of the invention is lower, and the compactness and bonding strength of the coating are improved.

Description

technical field [0001] The invention belongs to the technical field of preparing a graphene self-lubricating wear-resistant coating by a low-temperature self-propagating process, and in particular relates to a preparation method for forming a wear-resistant coating on an aluminum alloy cylindrical inner wall. Background technique [0002] Aluminum alloy has the advantages of low density, high strength, and good formability, and is widely used in the manufacture of various cylindrical parts. However, its low hardness and poor wear resistance and poor corrosion resistance limit its application. Through different surface modification methods, these shortcomings of aluminum alloys can be improved. At present, the surface treatment methods of modified aluminum alloys at home and abroad mainly include: electroplating, anodizing, thermal spraying, laser cladding, micro-arc oxidation and other methods. Among them, electroplating, anodization, and micro-arc oxidation are more suita...

AI Technical Summary

Problems solved by technology

[0004] High-temperature self-propagating technology can be used to prepare wear-resistant coatings for cylindrical parts with different inner diameters, but the limitation is that the system temperature is too high, Al and Fe 2 o 3 It is the basic component of high-temperature self-propagating synthetic coatings, and the Fe and Al formed by the reaction of the two 2 o 3 The wettability is not good, and the maximum adiabatic temperature of the reaction can reach 3509K, which is not only higher than that of aluminum alloy oxide or Al 2 o 3 The melting point of Al (2313K) is much higher than the boiling point of Al (2723K). During the reaction, Al will evaporate in large quantities, which will not only form a large number of pores in the coating, but also cause an imbalance in the ratio of reaction products.

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