Unlock instant, AI-driven research and patent intelligence for your innovation.

Surface plating of Ag-Ni electric contact and preparation process thereof

An electric contact, ag-ni technology, applied in the direction of coating, electrolytic coating, etc., can solve the problems of reducing the surface finish of the gold coating, the difference in the performance of the gold composite coating, and the decrease in the conductivity of the contact material, so as to improve the mechanical properties, Strengthen the gold plating layer and reduce the effect of internal stress

Inactive Publication Date: 2012-05-09
TIANJIN UNIV
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of solid particles will reduce the smoothness of the gold plating surface, resulting in a decrease in the conductivity of the contact material. At the same time, the solid particles are mostly nano-scale, and the dispersant will be affected by the plating solution when added to the plating solution. In the gold plating solution, the dispersion ability of the dispersant to the nanoparticles is different, resulting in the difference in the performance of the gold composite 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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Surface plating of Ag-Ni electric contact and preparation process thereof
  • Surface plating of Ag-Ni electric contact and preparation process thereof
  • Surface plating of Ag-Ni electric contact and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Composite electroplating adopts a regulated DC power supply, and constant temperature magnetic stirring is used during the electroplating process to make solid particles evenly and fully suspended in the plating solution; the anode is a platinum sheet with a specification of 1cm×1cm, and the distance between the anode and the workpiece is maintained at 4-5cm. Ensure that a stable plating solution layer is formed between the two and maintain a relatively stable current density and voltage.

[0030] Prepare nano-SiC / Ni composite plating solution, and configure nano-SiC / Ni composite plating solution after surface treatment of nano-SiC particles. The surface treatment of the particles includes putting the nano-SiC particles into the dilute NaOH solution and boiling for 10-30 minutes; then putting them into the hydrochloric acid aqueous solution with a volume ratio of 1:1 for ultrasonic soaking, the ultrasonic power is 300-500W, and the soaking time is 10-20min ;Finally, was...

Embodiment 2

[0035]First, put the cleaned and activated Ag-Ni matrix as the cathode and place it in the nano-SiC / Ni composite electroplating solution. The temperature of the bath is 50°C, the stirring speed is 200rpm, the current density is 50Am / cm2, the concentration of nano-SiC is 7g / L, and the electroplating time is 10min. ; Then the resulting plated piece is placed in the gold plating solution, the temperature of the plating solution is 40°C, the stirring speed is 100rpm, the current density is 25mA / cm2, and the electroplating time is 20min. Finally, ultrasonically clean the electroplated parts to remove the particles floating on the coating.

[0036] Carry out microhardness and resistivity test to single-layer pure gold coating and SiC / Ni+Au double coating of the present invention that above-mentioned embodiment 2 obtains through microhardness meter and four-probe tester, hardness test loading load 10g, loading time 5s, its test result is shown in the table below, the hardness of nano...

Embodiment 3

[0038] First, put the cleaned and activated Ag-Ni matrix as the cathode in the nano-SiC / Ni composite electroplating solution. The temperature of the bath is 50°C, the stirring speed is 200rpm, the current density is 60Am / cm2, the concentration of nano-SiC is 8g / L, and the electroplating time is 10min. ; Then the resulting plated piece is placed in the gold plating solution, the temperature of the plating solution is 40°C, the stirring speed is 100rpm, the current density is 20mA / cm2, and the electroplating time is 20min. Finally, ultrasonically clean the electroplated parts to remove the particles floating on the coating.

[0039] Carry out microhardness and electrical resistivity test to single-layer pure gold coating and SiC / Ni+Au double coating of the present invention that above-mentioned embodiment 3 obtains through microhardness tester and four-probe tester, hardness test loading load 10g, loading time 5s, its test result is shown in the table below, the hardness of the ...

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
Resistivityaaaaaaaaaa
Resistivityaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a surface plating of an Ag-Ni electric contact. A nano SiC / Ni composite plating and an Au plating are sequentially plated on the surface of an Ag-Ni electric contact substrate, wherein the SiC / Ni composite plating serves as a middle transition layer between the surface of the Ag-Ni electric contact substrate and the Au plating; the nano SiC / Ni composite plating has the thickness of 1.5-2.2 mu m; and the Au plating has the thickness of 0.8-1.5 mu m. By introducing the SiC / Ni composite plating to serve as the middle transition layer, the hardness of the Au plating is significantly improved, the binding force between the plating and the substrate is increased, the internal stress of the plating is reduced, and the conductibility of the plating is not influenced; and at the same time, due to the preparation of the Ni composite plating, the thickness of the Au plating can be reduced, and the phenomenon that the plating is out of action and significance because substrate elements permeate through the Au plating and are enriched on the surface can be effectively prevented.

Description

technical field [0001] The invention relates to a surface coating of an electric contact material and a preparation process thereof, in particular to a surface coating of an Ag-Ni electric contact and a preparation process thereof. Background technique [0002] The electrical contact material is the component that contacts, breaks and connects the current-carrying circuit through mechanical action in the switching device. The phenomenon of electrical contacts during the opening and closing process is extremely complex, and it is generally required to have high electrical conductivity, high thermal conductivity, good wear resistance, corrosion resistance, low and stable contact resistance and other characteristics. [0003] The early electrical contact materials mostly used pure silver, but due to the low melting point, low hardness and poor wear resistance of pure silver, the surface is easy to form a vulcanized film. In order to make up for the shortage of pure silver, a sm...

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
IPC IPC(8): C25D5/12C25D15/00C25D3/12C25D3/48
Inventor 魏强刘圣贤王丹
Owner TIANJIN UNIV