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Production method of tungsten carbide base ball shaped thermal spray coating powder

A technology of thermal spraying powder and production method, which is applied in the production field of tungsten carbide-based cemented carbide spherical thermal spraying powder, which can solve problems such as easy cake formation, burning loss, and large equipment investment, and achieve regular powder shape and wear resistance The effect of improved performance and short process flow

Inactive Publication Date: 2005-10-26
ZIGONG CEMENTED CARBIDE CORP
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  • Claims
  • Application Information

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Problems solved by technology

However, the required plasma flame furnace is very expensive, the equipment investment is large, and the production capacity of spheroidization is extremely low. The general production rate is only 5kg / hour, and the production cost is extremely high; The temperature range is 5500 ~ 17000 ℃), if the WC powder is heated in the flame flow, the burning loss is serious and it is easy to cake, so this process method cannot be used for the production of cemented carbide spherical spray powder

Method used

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  • Production method of tungsten carbide base ball shaped thermal spray coating powder
  • Production method of tungsten carbide base ball shaped thermal spray coating powder

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Embodiment 1

[0015] The present embodiment is a production method of spherical thermal spray powder with WC as a base material and Co as a binding phase, and its method is:

[0016] A. Wet grinding to prepare slurry: 252kg of WC powder and 48kg of Co powder that meet the requirements of the national standard for industrial production are placed in the ball mill, and 67kg of hexane with a purity of 99% (industrial purity) is added simultaneously, and wet for 30 hours to powder The Fisher particle size is 1.0 ~ 3.0μm, then add 4kg of paraffin and then wet grinding for 4 hours to make a slurry;

[0017] B, spray-drying granulation: the prepared slurry is sent into the slurry stirring tank of the closed-loop pressure spray drying device with model HC-3000, and then 33kg of hexane is added to adjust the solid-to-liquid ratio of the slurry to 3 : 1, under stirring conditions, the slurry is sprayed into the drying chamber for drying and granulation; wherein: the diameter of the spray sheet is φ0....

Embodiment 2

[0023] The present embodiment is a production method of spherical thermal spray powder with WC as the base material and Co and Cr as the binding phase, and the method is:

[0024] A. Wet grinding to prepare slurry: put 258.45kg of WC powder, 30.15kg of Co powder, and 11.4kg of Cr powder that meet the requirements of the national standard for industrial production into the ball mill, add 67kg of industrially pure hexane at the same time, and wet-mill for 31 hours until the powder is Feiji grains reach 1.0-3.0μm, then add 6kg of paraffin and then wet-grind for 4.5 hours to prepare a slurry;

[0025] B, spray drying granulation: the prepared slurry is sent into the slurry stirring tank of the closed-loop pressure spray drying device, then 33 kg of hexane is added to adjust its solid-liquid ratio to 3:1, and under stirring conditions, the The slurry is sprayed into the drying chamber for drying and granulation; the diameter of the spray sheet is φ0.8mm, the spray pressure is 1.3Mp...

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Abstract

A process for preparing the WC-based spherical powder for thermospray coating includes such steps as proportionally mixing WC, Co or mixture of Co and Cr, hexane and paraffin wax, wet grinding, spray drying, granulating, sieving, sintering under protection of H2, and classifying.

Description

technical field [0001] The invention belongs to a production method of a thermal spray powder material (composite), in particular to a production method of a tungsten carbide-based hard alloy spherical thermal spray powder. The spherical spray powder produced by this method can be widely used in high-speed oxygen fuel spraying to form a dense coating with excellent wear resistance and other properties on the surface of the substrate. Background technique [0002] The traditional composite powder for thermal spraying is generally produced by mechanical mixing method and sintering and crushing method. Tungsten carbide-based thermal spray powder is a composite powder with tungsten carbide (WC) as the base material and Co or Co and Cr as the binder phase. The production of tungsten carbide-based thermal spray powder by mechanical mixing method is to use a certain proportion of tungsten carbide powder and Co powder or Co and Cr powder through mechanical mixing. Although the met...

Claims

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Application Information

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IPC IPC(8): B22F9/04
Inventor 石建华尹刚李伟勤何宪峰曹万里
Owner ZIGONG CEMENTED CARBIDE CORP
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