Novel iron-aluminum thermal-spraying powder core wire material

Abstract

The invention discloses novel iron-aluminum thermal-spraying powder core wire material, which mainly comprises the following main components by weight: 40-70% of aluminum powder, 10-20% of magnesium powder, 30-35% of ferric oxide, 2-4% of potassium chloride and the balance of impurities such as Mn, Si, S and P, wherein the potassium chloride is used as oxidant of the magnesium powder; the magnesium powder is combusted so as to release heat quantity, so that the ferric oxide and the aluminum powder are in thermit reaction; a product obtained by the thermit reaction is in chemical reaction with residual aluminum powder again so as to form a Fe-Al intermetallic compound; and the content of the impurities such as S and P is controlled below 0.03%. The iron-aluminum thermal-spraying powder core wire material disclosed by the invention is characterized by reasonable component preparation and suitable cost; raw materials are subjected to metallurgical reaction completely in a coating layer preparation procedure; the prepared iron-aluminum intermetallic compound is high in content; so that, the coating layer has preferable performances such as high-temperature vulcanization resistance, oxidation, high-temperature corrosion resistance and the like. Therefore, the prepared parts are applied more widely.

Description

Technical field [0001] The invention relates to an iron-aluminum thermal spray powder core wire material, in particular to a novel iron-aluminum thermal spray powder core wire material that is easy to form an intermetallic compound, and belongs to the technical field of metal coatings. Background technique [0002] Intermetallic compound is a material with excellent high temperature performance between metal and ceramic, especially iron-aluminum intermetallic compound, which not only has excellent oxidation resistance, anti-sulfurization performance, corrosion resistance and high high temperature strength , And does not contain precious metal elements, the preparation cost is low, and it has a very wide range of uses. However, intermetallic compounds have the Achilles' heel of brittleness and are difficult to process and shape, which hinders the development of applications. The emergence of powder-cored wire by arc spraying provides a new opportunity for the development of inter...

AI Technical Summary

Problems solved by technology

[0003] However, the metallurgical reaction of high-speed arc spraying used at the present stage is used to obtain intermetallic compound coatings. Due to the fast cooling rate of molten particles and insufficient metallurgical reactions, the obtained coatings have defects such as too little compound content and poor performance.