Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of preparation method of copper chromium alloy surface superhard coating

A copper-chromium alloy and hard coating technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of easy failure, easy surface wear, poor resistance to arc ablation, etc., to improve surface performance, good focus Sex, small heat affected area effect

Inactive Publication Date: 2019-01-15
CHONGQING UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the situation that the surface of Cu-Cr alloy contact material is easy to wear, has poor arc ablation resistance, and is easy to fail during use. It designs and provides a superhard strengthening layer on the surface of Cu-Cr alloy contact material. The preparation method, the purpose of which is to coat the surface of the alloy by coating, and then use pulsed laser equipment to carry out surface strengthening treatment on the Cu-Cr alloy contact material, improve the microstructure of the alloy surface, and form a layer on the surface with Cu-Cr alloy The cladding layer with good adhesion to the substrate improves the mechanical properties such as the microhardness and wear resistance of the Cu-Cr alloy contact material surface, thereby improving its withstand voltage strength and arc ablation resistance

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of copper chromium alloy surface superhard coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The CuCr25 alloy with a Cr wt.% content of 25 wt.% was prepared by vacuum induction melting, and machined into a round alloy sample with a diameter of 30 mm and a height of 5 mm. The sample was polished with sandpaper, and then the CuCr25 sample was placed in the Wash it in an ultrasonic cleaning machine with alcohol for 8 minutes; then clean it with water and alcohol in turn, and dry it with a hair dryer after cleaning. Dissolve a small amount of polyvinyl alcohol particles in 100 ml of boiling water to prepare an aqueous solution of polyvinyl alcohol as a binder. The Co-based composite powder with a W content of 8wt.% was uniformly mixed with a binder to form a paste, which was then coated on the surface of a clean CuCr25 alloy block, and then dried at 80 °C for 3 h. Place the dried sample on the stage of the laser equipment, start the Nd:YAG pulsed laser equipment for overlapping scanning, the overlapping rate is 30%, the main parameters of the laser surface strength...

Embodiment 2

[0031] The CuCr25 alloy with a Cr wt.% content of 25 wt.% was prepared by vacuum induction melting, and machined into a round alloy sample with a diameter of 30 mm and a height of 5 mm. The sample was polished with sandpaper, and then the CuCr25 sample was placed in the Clean it in an ultrasonic cleaning machine with alcohol for 10 minutes; then clean it with water and alcohol in turn, and dry it with a hair dryer after cleaning. Dissolve a small amount of polyvinyl alcohol particles in 100 ml of boiling water to prepare an aqueous solution of polyvinyl alcohol as a binder. The Co-based composite powder with a W content of 10wt.% was uniformly mixed with a binder to form a paste, which was then applied on the surface of a clean CuCr25 alloy block, and then dried at 80 °C for 3 h. Place the dried sample on the stage of the laser equipment, start the Nd:YAG pulsed laser equipment for lap scanning, the lap rate is 30%, the main parameters of the laser surface strengthening treatm...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a super-hard coating on the surface of copper-chromium alloy. The preparation method comprises the following steps: (1) performing pretreatment such as surface washing on Cu-Cr alloy; (2) uniformly coating mixed paste on the surface of the base material Cu-Cr alloy and subsequently drying, wherein the mixed paste takes Co-based alloy powder of which the content of W is 6wt% to 15wt% and a polyvinyl alcohol solution as an adhesive, and the thickness of the coating is about 1mm to 2mm; (3) performing overlapping scanning on the coating by using a pulsed laser, wherein the scanning power is 400W to 600W, the defocusing distance is 2mm to 5mm, the scanning speed is 2mm / s to 10mm / s, the pulse width is 1ms to 8ms, and the frequency is 20Hz. By coating a W-containing Co-based composite coating which is 200 micrometers in thickness on the surface of a copper-chromium alloy contactor material by means of laser cladding, the preparation method disclosed by the invention is capable of obviously thinning the microstructure of the copper-chromium alloy contactor material, also greatly improving the micro-hardness and the wear resistance, and improving other comprehensive mechanical properties such as the voltage resistance strength and the electric arc erosion resistance of the copper-chromium alloy contactor material; the preparation method has the advantages of being reliable in technique, simple in equipment, convenient to operate, stable in quality, high in efficiency and the like.

Description

technical field [0001] The invention relates to a method for preparing a superhard strengthening layer on the surface of a copper-chromium alloy, specifically a laser cladding process on the surface of a copper-chromium alloy. An alloyed layer with high hardness, high wear resistance and high withstand voltage strength is formed on the surface of a material, which belongs to the technical field of material surface treatment and strengthening. Background technique [0002] Cu-Cr alloy combines the high hardness and high temperature resistance of Cr with the good electrical and thermal conductivity of Cu. , electrical switches, wear-resistant materials, large high-speed turbine generator rotor wires, tram and electric train overhead wires, etc. are widely used. The contact material is the key material of the vacuum circuit breaker, which directly affects the electrical performance of the vacuum circuit breaker. High-voltage contact materials work under the harsh conditions o...

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): C23C24/10
CPCC23C24/106
Inventor 周志明肖红梅陈光海梦醒周昆凤黄伟九涂坚黄灿柴林江
Owner CHONGQING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com