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Method for agglomerating and granulizing superfine nano WC-Co composite powder

A kind of composite powder and nanotechnology, applied in the field of cermet coating, can solve the problems of small particle size and quality, uniform transportation, poor fluidity, etc., achieve excellent comprehensive performance, prevent rapid coarsening, and good sphericity

Active Publication Date: 2010-11-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at ultra-fine and nano-scale WC-Co composite powder, which cannot be quickly and uniformly transported into the thermal spraying flame due to the small particle size and mass, poor fluidity, etc., so it is difficult to prepare ultra-fine and nano-structured hard In view of the problem of high-quality alloy coating, a technology of agglomeration and granulation of ultrafine and nanometer WC-Co composite powder is proposed. After the ultrafine and nanometer WC-Co composite powder is agglomerated and granulated by the method of the present invention, the agglomerated particles can be directly used In the thermal spraying process, prepare ultra-fine and nano-structured cemented carbide coatings with excellent comprehensive properties

Method used

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  • Method for agglomerating and granulizing superfine nano WC-Co composite powder
  • Method for agglomerating and granulizing superfine nano WC-Co composite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0019] WC-12Co composite powder with an average particle size of 80nm (morphology such as figure 1 (a)) mixed with polyvinyl alcohol (PVA), polyethylene glycol (PEG) and deionized water in a certain proportion to prepare a slurry, wherein the WC-12Co composite powder quality is 45% of the total mass of the slurry, and the PVA quality is 2% of the composite powder mass, PEG mass is 3% of the composite powder mass. The specific steps are: first calculate the quality of deionized water required according to the predetermined slurry composition parameters, dissolve PVA and PEG in deionized water respectively, then mix and stir the composite powder and the aqueous solution of PVA, and finally add the aqueous solution of PEG, Stir for at least 30 minutes to obtain a slurry of WC-Co composite powder. If bubbles are generated, add n-butanol defoamer dropwise. After the slurry is prepared, the slurry is sprayed and granulated using centrifugal atomization drying equipment, the inlet ...

Embodiment 2

[0022] WC-12Co composite powder with an average particle size of 210nm (morphology such as figure 1 (b)) mixed with polyvinyl alcohol (PVA), polyethylene glycol (PEG) and deionized water in a certain proportion to prepare a slurry, wherein the WC-12Co composite powder quality is 55% of the total mass of the slurry, and the PVA quality is 3% of the composite powder mass, PEG mass is 2% of the composite powder mass. The specific steps are: first calculate the quality of deionized water required according to the predetermined slurry composition parameters, dissolve PVA and PEG in deionized water respectively, then mix and stir the composite powder and the aqueous solution of PVA, and finally add the aqueous solution of PEG, Stir for at least 30 minutes to obtain a slurry of WC-Co composite powder. If bubbles are generated, add n-butanol defoamer dropwise. After the slurry is prepared, use centrifugal atomization drying equipment to spray and granulate the slurry. The inlet temp...

Embodiment 3

[0025] WC-12Co composite powder with an average particle size of 380nm (morphology such as figure 1 (c)) mixed with polyvinyl alcohol (PVA), polyethylene glycol (PEG) and deionized water in a certain proportion to prepare a slurry, wherein the WC-12Co composite powder quality is 65% of the total mass of the slurry, and the PVA quality is 4% of the composite powder mass, PEG mass is 1% of the composite powder mass. The specific steps are: first calculate the quality of deionized water required according to the predetermined slurry composition parameters, dissolve PVA and PEG in deionized water respectively, then mix and stir the composite powder and the aqueous solution of PVA, and finally add the aqueous solution of PEG, Stir for at least 30 minutes to obtain a slurry of WC-Co composite powder. If bubbles are generated, add n-butanol defoamer dropwise. After the slurry is prepared, the slurry is sprayed and granulated using centrifugal atomization drying equipment. The inlet...

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Abstract

The invention discloses a method for agglomerating and granulizing superfine nano WC-Co composite powder, which belongs to the technical field of metal ceramic coatings and comprises the following steps of: mixing the superfine nano WC-Co composite powder with polyvinyl alcohol, polyethylene glycol and deionized water according to a certain ratio to prepare a slurry; atomizing and granulizing the slurry of the WC-Co composite powder with centrifugal atomizing drying equipment, wherein the inlet temperature of the dryer is 140-200 DEG C and the rotation frequency of an atomizing tray is 200-300Hz; and performing heat treatment on the atomized and dried powder with a vacuum heat treating furnace, wherein the temperature of heat treatment is 950-1,200 DEG C, the time for heat preservation is 1-2 hours and argon is maintained in the furnace. By the method, agglomerated granules of which the average particle diameter and the granulometric distribution meet the requests of the thermal spraying technique can be obtained. The sphericility of the agglomerated granules is good, so the agglomerated granules can be used for preparing hard alloy coating with a superfine nano structure and good combination property.

Description

technical field [0001] The invention relates to a method for agglomerating and granulating ultrafine and nanometer WC-Co composite powder, which belongs to the technical field of cermet coatings. Background technique [0002] WC-Co cemented carbide coatings have comprehensive performance advantages of wear resistance, corrosion resistance and fatigue resistance that are incomparable to other materials under industrial and mining conditions such as abrasive wear and erosion wear, and have been successfully applied in many industrial fields. However, at present, micron-sized coarse powder WC-Co coatings are mainly used in industrial fields at home and abroad. Carbide coating has higher hardness, strength and toughness. Our existing research work shows that compared with coarse powder WC-Co cemented carbide coatings, due to the special small size effect and surface effect of ultrafine and nano powders, the melting point of powder particles is reduced and the surface properties...

Claims

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Application Information

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IPC IPC(8): B01J2/04B22F1/00
Inventor 宋晓艳王海滨刘雪梅高杨
Owner BEIJING UNIV OF TECH
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