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Method for producing spherical thermal-spraying powder

A technology of thermal spraying powder and production method, which is applied in coating, melting spraying, metal material coating technology and other directions, can solve the problems of difficult to produce thermal spraying powder, low granulation efficiency, large difference in sintering density, etc. Achieve stable and consistent quality, high production efficiency, and small equipment investment

Inactive Publication Date: 2012-02-15
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal spray powder produced by this method has good sphericity, but the spray granulation method used in the production of thermal spray powder less than 45 microns requires the use of spray sheets with small apertures of 0.6mm and 0.8mm, so that the efficiency of granulation It is very low, and it is more difficult to produce finer thermal spray powder with a particle size of 5 to 30 microns; the continuous molybdenum wire sintering furnace with a hydrogen atmosphere used in this method has a large temperature difference in the furnace and low temperature control accuracy, resulting in different after sintering. The sintering density of the thermal spray powder in the graphite boat or even in the same graphite boat is quite different, so the density consistency of the product is not good, so the consistency of the product quality is not good
In addition, hexane, the wet grinding medium used in the production of spray powder by this method, is a toxic substance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The production method of the spherical thermal spray powder with WC as the base material and Co as the binding phase.

[0019] A. Wet mill preparation slurry: put 413.6kg of WC powder (accounting for 94% of raw material mass percentage) and 26.4kg of Co powder (accounting for 6% of raw material mass percentage) that meet the requirements of the national standard for industrial production into the ball mill, and add 79.2 One liter of deionized water was used as the wet grinding medium (accounting for 18% of the mass percentage of the raw material powder) and 8.8kg of molding agent polyethylene glycol (also known as PEG, accounting for 2.0% of the mass percentage of the raw material powder), and wet milled for 15 hours to make a mixture pulp;

[0020] B. Centrifugal atomization drying and granulation: Send the prepared slurry into the slurry mixing tank of the centrifugal spray drying device, and after stirring evenly, spray the slurry into the drying chambe...

Embodiment 2

[0025] Embodiment 2: The production method of the spherical thermal spray powder with WC as the base material and Ni as the binding phase.

[0026] A. Wet mill preparation slurry: put 295.68kg of WC powder (accounting for 6.27% of the mass percentage of raw materials) and 144.32kg of Ni powder (accounting for 32.8% of the mass percentage of raw materials) that meet the requirements of the national standard for industrial production into the ball mill, and add 149.6 liter of alcohol (accounting for 34.0% of the mass percentage of raw materials) and 22kg of forming agent polyethylene glycol (accounting for 5% of the mass percentage of raw materials), wet milling for 40h to make a mixed slurry;

[0027] B. Centrifugal atomization drying and granulation: Send the prepared slurry into the slurry mixing tank of the centrifugal spray drying device, and after stirring evenly, spray the slurry into the drying chamber for drying and granulation. The diameter of the atomizing disc of the...

Embodiment 3

[0032] Embodiment 3: The production method of the spherical thermal spray powder with WC as the base material and Fe as the binding phase.

[0033] A. Wet mill preparation slurry: put 396kg of WC powder (accounting for 90% of the mass percentage of raw materials) and 44kg of Fe powder (accounting for 10% of the mass percentage of raw materials) that meet the requirements of the national standard for industrial production into the ball mill, and add 132 liters of Ionized water (accounting for 30% of the mass percentage of raw materials) and 13.2kg of forming agent polyethylene glycol (accounting for 3% of the mass percentage of raw materials) were wet milled for 21 hours to make a mixed slurry;

[0034]B. Centrifugal atomization drying and granulation: Send the prepared slurry into the slurry mixing tank of the centrifugal spray drying device, and after stirring evenly, spray the slurry into the drying chamber for drying and granulation. The diameter of the atomizing disc of th...

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Abstract

The invention discloses a method for producing spherical thermal-spraying powder. The method sequentially comprises the steps of: A, firstly, adding 55-95% of tungsten carbide powder, 5-33% of metal nickel powder or cobalt powder or iron powder, and 0-22% of chromium carbide powder into a ball grinding mill in terms of mass percentage, meanwhile, adding 15-35% of wet-grinding media and 2-5% of a forming agent in terms of the total mass of raw material powder, and performing wet grinding for 12-40h to obtain mixed slurry; B, centrifuging, atomizing and pelleting to obtain spherical mixed powder; C, placing the spherical mixed powder into a dewaxing and sintering integrated furnace, removing the forming agent, sintering for 20-70min in vacuum at the temperature of 800-1350 DEG C, cooling to below 50 DEG C and discharging out of the furnace; and D, crushing and sieving agglomerate materials obtained in the step C to obtain the spherical thermal-spraying powder. The method disclosed by the invention has wide applicability, and is not only suitable for producing the tungsten-carbide-based spherical thermal-spraying powder but also suitable for producing the thermal-spraying powder of other metal, nonmetal and mixtures of metal and nonmetal; and a production process is nonhazardous, the quality is stable and consistent, and the thermal-spraying powder smaller than 30 micrometers can be produced.

Description

technical field [0001] The invention relates to a production method of spherical thermal spray powder composite material, in particular to a production method of spherical thermal spray powder with metal and / or metal carbide as the main raw material. The spherical thermal spraying powder produced by this method can be used for high-velocity oxygen fuel spraying, plasma spraying, detonation spraying and other spraying, so as to form a dense coating with excellent wear resistance and corrosion resistance on the surface of the substrate. Background technique [0002] Traditional composite powders for thermal spraying are generally produced by mechanical mixing and sintering and crushing methods. The mechanical mixing method is essentially a kind of mixed material, and it cannot be called a composite powder. Although this method has the characteristics of simple process and low production cost, it has the disadvantages of poor uniformity and unstable quality of the obtained mixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F9/08C23C4/04
Inventor 江丙武喻玮强邹德良张重彦赵东阳进
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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