Preparation method of detonation-sprayed tungsten carbide wear-resistant coatings

A technology of explosive spraying and wear-resistant coating, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., and can solve coating embrittlement and processing cracking, high oxygen content, WC-Co cemented carbide Serious decarburization of the grinding coating and other problems can be achieved to avoid the failure of parts and improve the service life

Active Publication Date: 2015-01-07
KING STRONG MATERIAL ENG LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uncontrollable explosion energy, temperature and spraying atmosphere, the prepared WC-Co cemented carbide wear-resistant coating has technical difficulties such as serious decarburization, high oxygen content, coating embrittlement and processing cracking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The base material of the workpiece is 35Ni4Cr2MoA high-strength structural steel, and the sample size is Φ42mm×200mm. Before spraying, use acetone to ultrasonically clean the surface of the workpiece base material to remove grease, and then use 46# emery to perform sandblasting and roughening treatment, and use a turntable to clamp the workpiece base material for spraying. The temperature of the workpiece base material after spraying is 100-120°C . The detonation spraying process parameters are shown in Table 1, and the coating composition and properties are shown in Table 2.

[0016] Table 1 Explosive spraying process parameters

[0017] Process parameters

WC-12Co

WC-17Co

Explosion frequency

6 times / second

6 times / second

o 2 :C 2 h 2 :C 3 h 8 Flow ratio

(1.5:1:0.2)m 3 / h

(1.5:1:0.2)m 3 / h

Spray distance

200mm

200mm

Muzzle diameter

25

25

Feeding volume

0.9g / s

0.9g / ...

Embodiment 2

[0023] The base material of the workpiece is 35Ni4Cr2MoA high-strength structural steel, and the sample size is Φ22mm×120mm. Before spraying, use acetone to ultrasonically clean the surface of the workpiece base material to remove grease, then use 46# corundum for sandblasting and roughening treatment, and use a turntable to clamp the workpiece base material for spraying. The temperature of the workpiece base material after spraying is 80-100°C . The detonation spraying process parameters are shown in Table 3, and the coating composition and properties are shown in Table 4.

[0024] Table 3 Explosive spraying process parameters

[0025] Process parameters

WC-12Co

WC-17Co

Explosion frequency

4 times / second

4 times / second

o 2 :C 2 h 2 :C 3 h 8 Flow ratio

(1.3:1:0.15)m 3 / h

(1.3:1:0.15)m 3 / h

Spray distance

150mm

150mm

Muzzle diameter

20

20

Feeding volume

0.6g / s

0.6g / s

...

Embodiment 3

[0029] The base material is 35Ni4Cr2MoA high-strength structural steel, and the sample size is Φ8mm×70mm. Before spraying, use acetone to ultrasonically clean the surface of the workpiece base material to remove grease, then use 46# corundum for sandblasting and roughening treatment, and use a turntable to clamp the workpiece base material for spraying. The temperature of the workpiece base material after spraying is 60-80°C . The detonation spraying process parameters are shown in Table 5, and the coating composition and properties are shown in Table 6.

[0030] Table 5 Explosive spraying process parameters

[0031] Process parameters

WC-12Co

WC-17Co

Explosion frequency

3 times / second

3 times / second

o 2 :C 2 h 2 :C 3 h 6 Flow ratio

(1.2:1.0:0.1)m 3 / h

(1.2:1.0:0.1)m 3 / h

Spray distance

150mm

150mm

Muzzle diameter

16mm

16mm

Feeding volume

0.3g / s

0.3g / s

spot overlap...

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Abstract

The invention discloses a preparation method of detonation-sprayed tungsten carbide wear-resistant coatings which can be applied to connecting pieces of helicopter rotor systems. The method comprises the following steps: carrying out cleaning and sand blowing treatment on the surface of a substrate of a workpiece; preparing a tungsten carbide wear-resistant coating on the surface of the substrate of the workpiece by using a detonation spraying method, and controlling the temperature of the substrate of the workpiece at 60-120 DEG C; and after the detonation spraying is completed, carrying out grinding finish-machining on the coating by using a diamond or cubic boron nitride grinding wheel until the surface of the coating on the substrate of the workpiece has no burn and crack; the microhardness HV0.3 of the coating is 1000-1400; the bonding strength of the coating and the substrate of the workpiece is greater than or equal to 70 MPa; the porosity is less than or equal to 1.0; and the oxygen content is less than or equal to 2%. Once the method provided by the invention is adopted for carrying out spraying treatment on the surface of a connecting piece of a helicopter rotor system, the failure of parts caused by fretting wear and surface tear can be effectively avoided, so that the service life of the coating can be increased by 5-8 times.

Description

technical field [0001] The invention relates to a thermal spraying technology of a hard alloy wear-resistant coating, in particular to a preparation method of an explosion-sprayed tungsten carbide wear-resistant coating used for a connecting part of a helicopter rotor system. Background technique [0002] Wear is one of the three main forms of material failure, and equipment failure is often caused by the failure of individual parts. The connecting parts of the helicopter rotor system have high requirements on the surface performance, especially under the conditions of high speed and heavy load, the local wear of the surface will cause the failure of the parts and reduce the reliability of the equipment. Tungsten carbide is the coating material with the highest hardness below 540°C. When plasma spraying is used, the central flame is close to 10,000°C. After the tungsten carbide spraying material is heated to a molten state, it is impacted by the plasma arc flame at high spee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/12C23C4/126
CPCC23C4/06
Inventor 赵立英王刚刘平安吴清军
Owner KING STRONG MATERIAL ENG LTD
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