Process for preparing large particle spherical metal ceramic nano composite spraying powder

Abstract

The invention relates to a macro aggregate spheroid metal ceramic nm compounding powder manufacture method. The primary powder constituents and the weight ratio is 50-70% titanium diboride, 10-24% cobalt, 6-13% chromium powder, 5-11% tungsten boride, and the other is rare earth powder. The process includes the following steps: making nm cobalt and chromium water solution, making metal ceramic nm compounding gel, spraying, taking grain powder stage treatment. The invention is low cost, simple method.

Description

technical field [0001] The invention relates to a method in the technical field of cermet materials, in particular to a method for preparing large-particle spherical cermet nanocomposite spraying powder. Background technique [0002] As the key process components of the hot-dip galvanizing unit, the service life of the sinking roll and the stabilizing roll of the galvanizing sinking roll system has been very short for a long time due to the corrosion of the molten aluminum-zinc alloy. Especially with the increase of the aluminum content in the zinc alloy, the service temperature of the alloy liquid rises thereupon, thereby causing the service life of the galvanized roller to be shortened sharply. With the continuous emergence of new galvanized coatings, the demand for 55% Al galvanized liquid is rising. This coating puts forward higher requirements for the use temperature of the molten solution, that is, 600 degrees. Therefore, higher requirements are put forward for the pe...

AI Technical Summary

Problems solved by technology

However, the powder involved in this patent is mainly a large-particle spherical submicron / nano / short fiber ceramic composite powder and its preparation method composed of powders of more than two sizes among the three primary ceramic powders of submicron, nanometer and short fiber. A method for preparing a large-particle spherical cermet nanocomposite spraying powder for thermal spraying involving easily oxidized nano-scale metal cobalt and chromium as constituent phases

Since metal cobalt and chromium reach the nanoscale, their specific surface area and surface energy are relatively large, and they are easily oxidized in air or water. Therefore, the traditional powder preparation and granulation process is not completely suitable for the preparation of this powder, and needs to be developed. A new preparation process to produce large-particle spherical metal-ceramic nanocomposite spray powders with nano-metals as part of the phase and suitable for thermal spraying