High temperature resistant surface-insulated FeCrAl electrothermal alloy and preparation method thereof

Abstract

The invention relates to a high temperature resistant surface-insulated FeCrAl electrothermal alloy, which is characterized in that a FeCrAl electrothermal alloy matrix is provided with a high temperature resistant insulated composite alumina protective layer containing rare earth; the preparation method for the high temperature resistant surface-insulated FeCrAl electrothermal alloy comprises the following steps: firstly, cleaning the surface of a FeCrAl electrothermal alloy; secondly, putting the FeCrAl electrothermal alloy into sol-gel for soaking; and finally taking the FeCrAl electrothermal alloy out, drying and performing proper heat treatment on the FeCrAl electrothermal alloy, and obtaining a high temperature resistant surface-insulated protective layer on the surface of the FeCrAl electrothermal alloy. For the FeCrAl electrothermal alloy prepared by the method, a compact composite film is formed through high-temperature solution treatment, is well combined with the matrix, takes composite alumina as a main raw material, and is formed on the surface of the FeCrAl electrothermal alloy by rare earth micro-alloying action. The thickness of the composite film is between 5 and 10 mu m, and the composite film has surface insulation, high temperature resistance and the like.

Description

Technical field: [0001] The invention relates to a preparation method of a FeCrAl electric heating alloy, in particular to a high temperature resistant surface insulating FeCrAl electric heating alloy and a preparation method thereof. Background technique: [0002] Although the FeCrAl series electric heating alloy has the advantages of high resistivity, small temperature coefficient of resistance, high operating temperature and low price, it has been widely used in industrial electric furnaces, household appliances, and far-infrared devices, but in some specific occasions, the FeCrAl series electric heating alloy The use of alloys is still subject to certain restrictions. The surface of ordinary FeCrAl electric heating alloy wire is conductive, and the electric heating wire wound with it must be opened to a certain gap during use. The production process is complicated, labor efficiency is reduced, and the life of the heating wire is reduced due to the uneven heating tempera...

AI Technical Summary

Problems solved by technology

[0002] Although the FeCrAl series electric heating alloy has the advantages of high resistivity, small temperature coefficient of resistance, high operating temperature and low price, it has been widely used in industrial electric furnaces, household appliances, and far-infrared devices, but in some specific occasions, the FeCrAl series electric heating alloy The use of alloys is still subject to certain restrictions

The surface of ordinary FeCrAl electric heating alloy wire is conductive, and the electric heating wire wound with it must be opened to a certain gap during use. The production process is complicated, the labor efficiency is reduced, and the uneven heating temperature of the heating wire due to the influence of the insulating material reduces its life.

In addition, ordinary FeCrAl electric heating alloy wire has poor high temperature resistance, short life at high temperature and many volatiles when used at high temperature, which limits its application in far-infrared radiators, especially high-temperature far-infrared radiators.