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A kind of nano-carbide reinforced tungsten carbide-based composite powder, coating and preparation method thereof with high erosion resistance and burst resistance

A technology based on tungsten carbide and composite powder, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., and can solve the problems that cannot meet the requirements of engineering use

Active Publication Date: 2020-10-20
MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the prior art, to provide a highly erosion-resistant and burst-resistant nano-carbide reinforced tungsten carbide-based composite powder, coating and preparation method thereof, to solve the problem of existing tungsten carbide-based cermet coatings. The problem that the layer material cannot meet the requirements of actual engineering use, while taking into account the good corrosion resistance, improve the erosion resistance and burst resistance of the equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Tungsten carbide (WC) with a particle size of 60-100nm, metal binder Co, and nano-tantalum carbide (TaC) with a particle size of 30-50nm are divided into tungsten carbide (WC): 80wt%, metal binder Co: 15wt%, Nanometer tantalum carbide (TaC): 5wt% mass percent is configured, alcohol and polyethylene glycol are added to the configured formula raw materials, and fully mixed in a ball mill for 20 hours.

[0029] Water atomization is used to spray dry and granulate the prepared slurry, and the granulated original composite powder is put into a molybdenum wire furnace under a hydrogen protective atmosphere for sintering, and the sintering temperature is 1100°C. After sintering, crushing and screening are carried out to obtain nano-tantalum carbide reinforced tungsten carbide-cobalt composite powder with high erosion resistance and burst resistance. The particle size of the composite powder is 15-45 μm.

[0030] Put the above-mentioned composite powder in an incubator for dry...

Embodiment 2

[0035] Tungsten carbide (WC) with a particle size of 50-90nm, metal binder Co, metal binder Cr, and nano-titanium carbide (TiC) with a particle size of 20-50nm are divided into tungsten carbide (WC): 70wt%, metal bonded Agent Co: 10wt%, metal binder Cr4wt%, nano-titanium carbide (TiC): 6wt% mass percentage is configured, and alcohol and polyethylene glycol are added to the configured formula raw materials, and fully mixed in a ball mill for 25 hours .

[0036]Water atomization is used to spray dry and granulate the prepared slurry, and the granulated original composite powder is put into a molybdenum wire furnace under a hydrogen protective atmosphere for sintering, and the sintering temperature is 1150°C. After sintering, crushing and screening are carried out to obtain nano-titanium carbide reinforced tungsten carbide-cobalt chromium composite powder with high erosion resistance and burst resistance. The particle size of the composite powder is 10-30 μm.

[0037] Put the a...

Embodiment 3

[0042] Tungsten carbide (WC) with a particle size of 60-120nm, metal binder Ni, metal binder Cr, nano-tantalum carbide (TaC) with a particle size of 20-50nm, nano-titanium carbide (TiC) with a particle size of 50-80nm, 20 ~50nm nano-zirconium carbide (ZrC) according to tungsten carbide (WC): 35wt%, metal binder Ni: 35wt%, metal binder Cr: 20wt%, nano-tantalum carbide (TaC): 4wt%, nano-titanium carbide (TiC): 2wt%, nano-zirconium carbide (ZrC): 4wt% mass percent for configuration, add alcohol and polyethylene glycol to the configured formula raw materials, and fully mix in a ball mill for 28 hours.

[0043] The prepared slurry was spray-dried and granulated by alcohol atomization, and the granulated original composite powder was sintered in a molybdenum wire furnace under a hydrogen protective atmosphere at a sintering temperature of 1150°C. After sintering, it is crushed and screened to obtain a composite powder with high erosion resistance and burst resistance. The particle ...

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Abstract

The invention discloses nanocarbide-enhanced tungsten-carbide-based composite powder with high erosion resistance and cracking resistance, a coating and a preparation method thereof. The nanocarbide-enhanced tungsten-carbide-based composite powder contains the following components: tungsten carbide (WC), metal binding agent and nanocarbide enhancing phase, wherein the nanocarbide enhancing phase is one or more of tantalum carbide (TaC), titanium carbide (TiC) and zirconium carbide (ZrC). The composite powder disclosed by the invention has the beneficial effects that the strength and the hardness of a metal binding phase can be effectively improved, and meanwhile the growth of crystal grains of the WC can be inhibited; the coating has the beneficial effects that the erosion resistance is improved by 50-200% compared with that of common tungsten-carbide-based metal ceramic coating, the toughness is also obviously improved, cracking can be almost avoided, meanwhile good high-temperature resistance, corrosion resistance and cavitation resistance are also maintained; in addition, the preparation method of the composite coating is reliable in process and stable in property, is suitable for application and promotion in the fields of erosion resistance and cavitation resistance of water turbines, water pumps and the like and is especially applicable to high-sediment water flow environments.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, and relates to a tungsten carbide-based cermet powder and a coating, in particular to a nano-carbide-reinforced tungsten carbide-based composite powder, a coating and a preparation method thereof with high erosion resistance and burst resistance . Background technique [0002] Erosion wear, cavitation, and corrosion are one of the main forms of failure of hydraulic machinery such as hydraulic turbines. They widely exist in the flow-passing parts of hydraulic turbines, pumps, etc., resulting in low operating efficiency of hydraulic mechanical efficiency equipment and shortened life. The stability and safe operation of the unit will result in a huge waste of resources and economy. Thermal sprayed tungsten carbide cermet coating has good erosion resistance and certain anti-cavitation and corrosion resistance. However, the erosion is still insufficient, especially the resista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/129C23C4/134C23C4/18
CPCC23C4/06C23C4/129C23C4/134C23C4/18
Inventor 陈小明赵坚伏利刘德有吴燕明周夏凉刘伟毛鹏展
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST
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