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Method for improving crankshaft face plasma spraying Mo coating combination strength

A combination of strength and plasma technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of large unmelted particles in the coating, low particle speed, difficult to control the spraying process, etc., and achieve oil immersion friction The coefficient is small, the bonding strength is improved, and the effect of mechanical occlusion is enhanced

Active Publication Date: 2018-07-27
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, flame spraying has the following obvious disadvantages: one is that there are large unmelted particles in the coating due to the low temperature of the flame spraying flame flow and the poor melting of the particles; It is difficult to control the spraying process, resulting in poor coating uniformity
However, as the size of the crankshaft becomes larger and the load in the application condition is larger and larger, the coating is subjected to alternating stress, and the bonding force between the existing coating and the substrate and the coating and the interior of the coating cannot meet the large displacement. , the requirements of the motor crankshaft with low load and high torque, so it is necessary to develop a coating with higher bonding strength

Method used

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  • Method for improving crankshaft face plasma spraying Mo coating combination strength
  • Method for improving crankshaft face plasma spraying Mo coating combination strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The diameter of the crankshaft in a plasma spraying embodiment described in this embodiment is 262 mm. After passing the blank inspection → milling end face centering → turning the short axis → rough grinding the spherical surface, after conventional degreasing and sandblasting, use plasma spraying equipment to spray Mo coating, adding 20% ​​by weight of spherical WC-10Co-4Cr particles with a particle size of -30+5μm. Use straight nozzle, spraying distance 115mm, working current 620A, Ar gas velocity 40L / min, hydrogen velocity 9L / min, oxygen velocity 11L / min, powder feeding rate 40g / min, cooling gas pressure 0.45MPa, spraying gun body relative to crankshaft Spraying surface moving speed: 50mm / s, crankshaft surface temperature <150°C, Mo coating thickness 0.35mm. The oxygen content in the Mo-based coating was tested by an oxygen and nitrogen tester, and the oxygen content was 1.81. The hardness of the coating was measured by the HSRD-45 electric surface Rockwell hardness ...

Embodiment 2

[0030] The diameter of the crankshaft in a plasma spraying embodiment described in this embodiment is 350 mm. After passing the blank inspection → milling end face centering → turning the short axis → rough grinding the spherical surface, after conventional degreasing and sandblasting, use plasma spraying equipment to spray Mo coating, adding 30% by weight of spherical WC-10Co-4Cr particles with a particle size of -30+5μm. Use straight nozzle, spraying distance 115mm, working current 620A, Ar gas velocity 40L / min, hydrogen velocity 9L / min, oxygen velocity 11L / min, powder feeding rate 40g / min, cooling gas pressure 0.45MPa, spraying gun body relative to crankshaft Spraying surface moving speed: 50mm / s, crankshaft surface temperature <150°C, Mo coating thickness 0.35mm. The oxygen content in the Mo-based coating was tested by an oxygen and nitrogen tester, and the oxygen content was 1.67. The hardness of the coating was measured by the HSRD-45 electric surface Rockwell hardness t...

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Abstract

The invention discloses a method for improving crankshaft face plasma spraying Mo coating combination strength. The requirement of a large-displacement large-torque motor crankshaft for combination force between a coating and a base body and combination force between the coating and the interior of the coating is higher and higher, WC-10Co-4Cr with the granularity being -30+5 micrometers and the weight ratio being 20 to 40% is added into Mo powder, in the spraying process, WC-10Co-4Cr particles impact a deposited coating by virtue of a certain speed obtained through plasma jet flow spraying, in the impacting process, kinetic energy of the particles is converted into deforming capacity and inner energy of the deposited particles, along with increasing of the impact number of the WC-10Co-4Crparticles, the deforming degree of the deposited coating is larger, the gap between the coating particles is extruded to be small and even the closing probability is larger, the hole shrinkage and crack arresting are achieved, mechanical occlusion between the coating and the base body is enhanced, cohesion between layers inside the coating is increased, the combination strength of the coating isimproved, and is improved to 58 MPa from 36 MPa, and the applying working condition need of a large-diameter crankshaft and large loads can be met.

Description

technical field [0001] The invention relates to a method for improving the bonding strength of a plasma sprayed Mo coating on the shaft surface of a crankshaft, in particular to a method for plasma spraying a Mo coating on a crankshaft of a large-diameter hydraulic motor. Background technique [0002] The low-speed high-torque hydraulic motor has good low-speed stability, large output torque, high starting efficiency, and compact structure. It is widely used in injection molding, engineering construction, mining and metallurgy and other industries. The crankshaft is the most important part of the low-speed high-torque hydraulic motor, and the working conditions are harsh (high torque, high pressure, severe wear). It requires not only sufficient strength and rigidity of the crankshaft as a whole, but also good wear resistance and anti-friction performance on the spherical surface of the crankshaft. The traditional surface treatment process is quenching, electroplating treatme...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/06C23C4/134
Inventor 朱霞高张忠诚朱晖朝陈志坤王枫雷运生康忠明陈焕涛戴红亮
Owner GUANGDONG INST OF NEW MATERIALS
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