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

A nanocomposite powder and cermet technology, which is applied in the field of cermet materials, can solve the problems that are not involved, are easy to oxidize in air or water, and have large specific surface area and surface energy, so as to improve quality, overcome oxidation problems, and prepare The effect of simple method

Inactive Publication Date: 2006-06-28
SHANGHAI JIAO TONG UNIV
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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

Method used

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Examples

Experimental program
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Embodiment Construction

[0022] Concrete embodiment is provided below in conjunction with the content of method:

[0023] Component percentage (weight%)

[0024] (1) Carry out the preparation of the aqueous solution of nanometer cobalt, chromium.

[0025] Dispersant percentage

[0026] Remarks: All percentages are weight ratios, and the mass of all solids in the constituent phases is the standard.

[0027] Mix surface-modified and inert nano-scale cobalt and chromium with deionized water and dispersant according to the proportions in the examples, and obtain a well-dispersed aqueous solution of nano-cobalt and chromium through wet ball milling. The wet ball milling equipment used is a planetary ball mill, and the ball milling medium is a carbide ball, and the diameter of the ball is between 5 mm and 15 mm. Other parameters of each embodiment are shown in Table 2.

[0028] (2) Preparation of cermet nanocomposite colloid

[0029] After adding other solid phase

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/00C04B35/626C22C24/00
Inventor 王俊翟长生吕和平孙宝德万晓隆
Owner SHANGHAI JIAO TONG UNIV
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