Method for forming ceramic coat on metallic surface by argon-arc welding assisted self-propagating

Abstract

The invention relates to a method for forming a ceramic coating on metal surfaces by argon arc welding-assisted self-propagating. The method comprises the following process steps: (1) batching: taking two or more powdered reactant materials which are capable of performing self-propagating high-temperature synthetic reaction and a powdered metal material which accounts for 0-40% of the total weight of the reactants as a powdered additive material according to chemical dosing proportion for batching; (2) mixing; (3) coating: coating the powdered materials mixed in the step (2) on the surface of a polished workpiece; (4) drying; and (5) performing the argon arc welding-assisted SHS: igniting the workpiece coating by electric arc with 80A current and 60V voltage, thus producing the self-propagating reaction on the workpiece surface coating and then producing the ceramic coating on the metallic matrix surface. The method has the advantages of directly forming and preparing the smooth and dense ceramic coating with high bonding strength, low porosity and high quality on the metal surfaces, high heat utilization efficiency, low coating preparation cost, easy control, small burning loss and sputtering, and being safe and reliable.

Description

(1) Technical field [0001] The invention is a method for preparing a ceramic coating on a metal surface. It belongs to the technical field of material surface engineering. (2) Background technology [0002] In recent years, with the large-scale research and development of ceramic materials, the connection technology of ceramics and ceramics or ceramics and metals has attracted more and more attention. Metal surface coating with ceramic coating can improve material wear resistance, corrosion resistance or high temperature resistance. There are many ways to form ceramic coatings on metal surfaces. Realizing the effective connection between ceramics and metals can further expand the application range of ceramics. However, since ceramics and metals are two types of materials with different properties, there are differences in chemical and physical properties at the interface when they are combined with each other, especially the difference in chemical bonds, and conventional ...

AI Technical Summary

Problems solved by technology

[0010] 6) The current carrying (current) capacity of the tungsten electrode is low, and the production efficiency is not high

[0011] 7) The price of argon and helium is relatively high, which is not conducive to reducing production costs

However, preheating the metal substrate to a higher temperature will cause deformation, and in the subsequent cooling, the thermal stress caused by the mismatch of the thermal expansion of the metal and the ceramic will cause the ceramic layer to peel off easily.