A kind of high conductive wear-resistant coating for guide rail and preparation process thereof

A preparation process and wear-resistant technology, applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of unstable coating performance and unexamined coating conductivity, and reduce planing failure Probability, solving the effect of incompatibility between wear resistance and conductivity, and high conductivity

Active Publication Date: 2019-03-08
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
View PDF7 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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 1.1 mm, and the coating composition is Mo 50%, Cu 20%, Cr 8%, B 2%, Si 3%, and the balance is Ni. The preparation process is spraying voltage 55V, current 750A, main air pressure 0.6MPa, main air flow 50L / min, auxiliary air pressure 0.5MPa, auxiliary air flow 6L / min, carrier air 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%, B 1.0%, 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%, B 2.5%, 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
angleaaaaaaaaaa
microhardnessaaaaaaaaaa
Login to view more

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 undergo 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 single...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap