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High-conductivity abrasion-resistant coating for guide rail and preparation technology thereof

A preparation process and wear-resistant technology, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of unexamined coating conductivity and unstable coating performance, so as to solve the problem of wear resistance Difficult to be compatible with electrical conductivity, reduce the probability of planing failure, and the effect of high electrical conductivity

Active Publication Date: 2017-01-04
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microhardness of the coating is 245~532HV, and the bonding strength with the substrate is 10~35MPa. The conductivity of the coating has not been examined, and the performance of the coating is unstable, so it is not suitable for the preparation of the guide rail coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The center area of ​​the contact surface between the guide rail and the armature has a cutting depth of 1.1mm, and the coating composition is Mo 50%, Cu 20%, Cr 8%, B2%, Si 3%, and the balance is Ni. The preparation process is spraying voltage 55V, current 750A, main gas pressure 0.6MPa, main gas flow 50L / min, auxiliary gas pressure 0.5MPa, auxiliary gas flow 6L / min, carrier gas flow 5L / min, powder feeding speed 30g / min, The spraying distance is 100mm, the spraying angle is 90°, the spraying speed is 250mm / s, and the substrate temperature is less than 180°C. The bonding strength of the prepared coating is 27MPa, the microhardness is 492HV0.1, the electrical conductivity is 7.3%IACS, and the surface roughness of the coating after grinding is 0.72um.

Embodiment 2

[0033]The center area of ​​the contact surface between the guide rail and the armature has a cutting depth of 1.15mm, and the coating composition is Mo 55%, Cu 25%, Cr 6%, B1.0%, Si 2%, and the balance is Ni. The preparation process is spraying voltage 55V, current 800A, main gas pressure 0.6MPa, main gas flow 60L / min, auxiliary gas pressure 0.5MPa, auxiliary gas flow 8L / min, carrier gas flow 5L / min, powder feeding speed 30g / min, The spraying distance is 100mm, the spraying angle is 90°, the spraying speed is 250mm / s, and the substrate temperature is less than 180°C. The prepared coating has a bonding strength of 25MPa, a microhardness of 484HV0.1, an electrical conductivity of 10.8%IACS, and a surface roughness of the coating after grinding of 0.70um.

Embodiment 3

[0035] The center area of ​​the contact surface between the guide rail and the armature has a cutting depth of 1.12mm, and the coating composition is Mo 55%, Cu 15%, Cr 10%, B2.5%, Si 3.5%, and the balance is Ni. The preparation process is spraying voltage 60V, current 800A, main gas pressure 0.6MPa, main gas flow 55L / min, auxiliary gas pressure 0.5MPa, auxiliary gas flow 8L / min, carrier gas flow 5L / min, powder feeding speed 30g / min, The spraying distance is 100mm, the spraying angle is 90°, the spraying speed is 250mm / s, and the substrate temperature is less than 180°C. The prepared coating has a bonding strength of 32MPa, a microhardness of 548HV0.1, an electrical conductivity of 6.5%IACS, and a surface roughness of the coating after grinding of 0.75um.

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Abstract

The invention relates to a high-conductivity abrasion-resistant coating for a guide rail and a preparation technology thereof. The coating comprises the following chemical components by content: 45 to 55% of Mo, 15 to 25% of Cu, 6 to 10% of Cr, 1 to 3% of B and 2 to 4% of Si, and the balance being Ni. The preparation technology comprises the steps like surface down cutting of the to-be-coated guide rail, surface cleaning of the guide rail, shield protection, sand-blasting roughening, coating preparation and coating grinding processing. The preparation technology is characterized in that a high-speed plasma spraying technology is adopted, a uniform and compact large-thickness, high-conductivity and abrasion-resistance coating can be prepared on the surface of an electromagnetic railgun launching guide rail, the thickness of the grinded coating is 1.0 to 1.1 mm, the bonding strength of the coating and the guide rail is 20 to 35 MPa, the microhardness of the coating is 450 to 600 HV, and the electric conductivity is 5 to 12% IACS. The obtained high-conductivity abrasion-resistant coating is mainly used in special parts like the electromagnetic railgun launching guide rail, the surface hardness, abrasion resistance and electrical erosion resistance of the guide rail can be effectively improved, the service life is prolonged, the thermal hardness of the surface of the guide rail is improved, the failure rate of grinding is decreased, and the coating has important engineering application value.

Description

technical field [0001] The invention relates to the technical field of thermal spraying coatings, in particular to a highly conductive and wear-resistant coating for guide rails and a preparation process thereof. Background technique [0002] When the electromagnetic rail gun is launched, the instantaneous current passing through the guide rail is as high as MA level. Under the internal resistance of the guide rail, the current skin effect, and the high-speed friction of the armature, the surface of the guide rail will withstand a great heat-flow impact, which will easily soften the surface of the guide rail material, even Melting, strength reduction, resulting in "planing", "transition" and other phenomena, significantly reducing the launch life of the guide rail. Therefore, the launch guide rail material needs to have comprehensive properties such as high strength, high hardness, high conductivity, wear resistance, and corrosion resistance. It is difficult for current sing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/134C23C4/18C22C30/02C22C27/04
CPCC22C27/04C22C30/02C23C4/06C23C4/18
Inventor 黄磊谢述锋武笑宇
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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