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A kind of ni-ti-nb-carbide composite coating with anti-cavitation anti-erosion and high bonding strength and preparation method thereof

A technology of combining strength and composite coating, applied in the direction of coating, metal material coating process, etc., can solve problems such as material wear, and achieve the effect of low production cost, stable performance and reliable process

Active Publication Date: 2018-08-31
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

[0005] In order to solve the problem of material wear and failure caused by cavitation and erosion of hydraulic machinery and prolong the service life of the material, the present invention provides a hydraulic machine with high forming efficiency, high cavitation resistance, high erosion resistance and high bonding strength. Cavitation-resistant and erosion-resistant materials, and suitable for large-area use of water conservancy machinery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Metal Ni powder with a purity of 99.95%, metal Ti powder with a purity of 99.95%, metal Nb powder with a purity of 99.95%, and WC powder according to Ni: 38wt%, Ti: 35wt%, Nb: 9wt%, WC: 18wt% The mass percentage is configured. Mix the configured powder in a ball mill for 10 hours to achieve homogenization of the composite powder.

[0027] 2. Lay the evenly mixed composite powder and put it in an incubator for drying. The holding temperature is 70°C and the drying time is 1 hour.

[0028] 3. Clean the surface of the cladding material with acetone or alcohol to remove oil stains on the surface. And put it in an incubator to preheat at 300°C.

[0029] 4. Use the semiconductor laser to laser weld the prefabricated composite powder onto the surface of the metal substrate by means of coaxial powder feeding. The laser welding process parameters are: laser power 2.6kW, welding speed 10mm / s.

[0030] The thickness of the anti-cavitation, anti-erosion and high bonding stren...

Embodiment 2

[0032] 1. Metal Ni powder with a purity of 99.95%, metal Ti powder with a purity of 99.95%, metal Nb powder with a purity of 99.95%, WC powder, and TiC powder according to Ni: 40wt%, Ti: 38wt%, Nb: 8wt%, WC: 8wt %, TiC: 6wt% mass percentage for configuration. Mix the configured powder in a ball mill for 12 hours to achieve homogenization of the composite powder.

[0033] 2. Lay the evenly mixed composite powder and put it in an incubator for drying. The holding temperature is 60°C and the drying time is 1 hour.

[0034] 3. Clean the surface of the cladding material with acetone or alcohol to remove oil stains on the surface. And put it in an incubator to preheat at 350°C.

[0035] 4. Use the semiconductor laser to laser weld the prefabricated composite powder onto the surface of the metal substrate by means of coaxial powder feeding. The laser welding process parameters are: laser power 2.5kW, welding speed 8mm / s.

[0036] The thickness of the high bonding strength anti-ero...

Embodiment 3

[0038] 1. Metal Ni powder with a purity of 99.95%, metal Ti powder with a purity of 99.95%, metal Nb powder with a purity of 99.95%, WC powder, TiC powder, Cr 3 C 2 Powder according to Ni: 40wt%, Ti: 36wt%, Nb: 6wt%, WC: 6wt%, TiC: 6wt%, Cr 3 C 2 : Configured with a mass percentage of 6wt%. Mix the configured powder in a ball mill for 12 hours to achieve homogenization of the composite powder.

[0039] 2. Lay the evenly mixed composite powder and put it in an incubator for drying. The holding temperature is 80°C and the drying time is 1 hour.

[0040] 3. Clean the surface of the cladding material with acetone or alcohol to remove oil stains on the surface. And put it in an incubator to preheat at 300°C.

[0041]4. Use the semiconductor laser to laser weld the prefabricated composite powder onto the surface of the metal substrate by means of coaxial powder feeding. The laser welding process parameters are: laser power 2.4kW, welding speed 8mm / s.

[0042] The high bonding ...

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Abstract

The invention discloses an anti-cavitation and anti-erosion high-bonding strength Ni-Ti-Nb-carbide composite coating. The coating is prepared through a laser cladding method, the coating is composed of 30wt%-45wt% of Ni, 30wt%-45wt% of Ti, 5wt%-15wt% of Nb and 10wt%-20wt% of carbide, and the carbide is one of WC powder, TiC powder and Cr3C2 powder or a mixture of two of the WC powder, the TiC powder and the Cr3C2 powder or a mixture of three of the WC powder, the TiC powder and the Cr3C2 powder. The microhardness of the coating is larger than 700 HV0.2, the cavitation mass loss of the coating is only 25%-35% of the mass loss of high-strength stainless steel, and in sandy running water, the erosion mass loss of the coating is only 30%-40% of the mass loss of the high-strength stainless steel. The production cost is low, the preparation method is reliable in process, performance is stable, and the anti-cavitation and anti-erosion high-bonding strength Ni-Ti-Nb-carbide composite coating is suitable for being applied on a large scale in the fields of hydraulic machinery flow passage components, compressor threaded rods, hoist piston rods, turbine blades and the like.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, and in particular relates to a Ni-Ti-Nb-carbide composite coating with anti-cavitation, anti-erosion and high bonding strength and a preparation method thereof. Background technique [0002] During the operation of hydraulic machinery such as water turbines and water pumps, the cavitation generated by rotation will cause serious cavitation wear, damage the surface of mechanical materials, and cause the efficiency and output of hydraulic machinery to decrease. In addition to the cavitation caused by cavitation, sediment erosion will also lead to wear and failure of flow-passing components, forcing the unit to be shut down for overhaul after a period of operation, resulting in huge waste of resources and energy and economic losses. [0003] NiTiNb alloy has the characteristics of shape memory benefit and superelasticity. It is an important shape memory alloy and is used as a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C32/00C23C24/10
CPCC22C30/00C22C32/0052C23C24/103
Inventor 陈小明吴燕明周夏凉赵坚伏利毛鹏展刘伟
Owner MIN OF WATER RESOURCES HANGZHOU MACHINERY DESIGN INST