Nano-composite metal ceramic powder for molten metal resistant erosion and method for manufacturing same

Abstract

The invention provides a nano complex metal ceramic powder used for the erosion of melting-resistant metals, the components and weight percentages of which are as following: 41 to 75 percent of zirconium diboride, 10 to 25 percent of cobalt, 7 to 12 percent of chromium powder, 2 to 10 percent of tungsten boride, 4 to 9 percent of molybdenum, and 0.5 to 1.7 percent of chromium carbide, the rest is cerium oxide, wherein the particle sizes of cobalt, chromium, tungsten boride, molybdenum, chromium carbide and cerium oxide are all between 0.5 Mum and 1 Mum, the particle size of zirconium diboride is less than 100nm, the powder can be produced by the processes of wet-ball grinding, spray granulation, heat treatment, plasma densification and particle classification, sink rolls and stable rolls after being sprayed by the powders has the advantages of high temperature resistance, corrosion resistance and abrasion resistance, the average time for being used on sink rolls of continuous hot-dipped al-zn group is 20 to 31 days, the times and time of changing sink rolls are reduced so as to save the cost, improve the economic benefit and improve the quality of aluminum plating zinc strip steels.

Description

technical field [0001] The invention relates to a thermal spraying powder in the technical field of materials, in particular to a nanocomposite cermet powder for corrosion resistance of molten metal. Background technique [0002] The sinking roll and stabilizing roll of the continuous hot-dip galvanizing unit work in a zinc pot with a zinc liquid at about 450 °C, and are important workpieces in the hot-dip galvanizing unit. The sinking roll and the stabilizing roll should have corresponding resistance to zinc liquid corrosion and wear resistance in the zinc pot, and should also have resistance to zinc particle adhesion. Sinking rolls and stabilizing rolls have long had a short service life due to the strong corrosion of molten zinc, and their main failure forms are corrosion, wear, and zinc sticking, which cause impressions or scratches on the surface of the strip. [0003] With the needs of modern industrial development, various new types of aluminum-zinc coatings continue...

AI Technical Summary

Problems solved by technology

The service life of the spare parts is short for one time on the machine, and the diameter needs to be reduced and repaired after the machine is off the machine, which consumes a lot

It takes a lot of time to stop and change rolls during production, which is not conducive to the long-term operation of production and increases operating costs and maintenance costs

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