A kind of silver base electric contact material and preparation method thereof

An electric contact material, silver-based technology, applied in contacts, circuits, electric switches, etc., can solve the problems that the actual density of the product is difficult to reach the theoretical density, increase the production cost, enter the gas, etc., and achieve super hardness and wear resistance performance, reducing concentrated ablation, and reducing surface temperature

Inactive Publication Date: 2016-06-29
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the above effects, the patent CN200610045640.X uses SnO 2 , ZnO, CdO, W, WC, C, MO in one or more, the rest is silver powder, and also contains a single form of oxide or nitride or a composite form of their mixture, although the invention also uses a composite However, if there are multiple powders and silver powders of composites and other powders in the mixture, it is easy to enter the gas during the preparation process, making it difficult for the actual density of the product to reach the theoretical density.
This molding method adopts processes such as hot pressing and annealing under vacuum conditions in the mold, and the process is complicated, which increases the production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve cerium nitrate in water to form a 1mol / L aqueous solution, add diamond abrasive grains and cerium nitrate aqueous solution together into a ball mill, disperse with a corundum ball mill for 1 hour, dry the mixture at 105°C for 4 hours in an infrared drying oven, and then load In an alumina crucible, under the protection of nitrogen or argon, bake at 650°C for 3h. The calcined product is crushed into diamond-cerium oxide core-shell composite abrasive grains.

[0013] Add diamond-cerium oxide core-shell composite abrasive grains into the three-dimensional mixer, add wetting agent, mix for 10 minutes, add silver powder, mix for 0.5h, add temporary adhesive, mix well, and granulate in the granulator , which is the molding material. Add the molding material into the mold, and press it on the press to form it. The formed test block was put into a high-temperature vacuum sintering furnace, and sintered at 950 ° C for 2 h with argon gas.

Embodiment 2

[0015] Dissolve cerium nitrate in water to form a 1.5mol / L aqueous solution, add diamond abrasive grains into the aqueous solution of cerium nitrate, disperse with ultrasonic waves for 2 hours, dry the mixture at 105°C for 4 hours in an infrared drying oven, and then put it into an alumina crucible , under nitrogen or argon protection, and baked at 750°C for 2h. The calcined product is crushed into diamond-cerium oxide core-shell composite abrasive grains.

[0016] Add diamond-cerium oxide core-shell composite abrasive grains into the three-dimensional mixer, add wetting agent, mix for 10 minutes, add silver powder, mix for 0.5h, add temporary adhesive, mix well, and granulate in the granulator , which is the molding material. Add the molding material into the mold, and press it on the press to form it. The formed test block was put into a high-temperature vacuum sintering furnace, and sintered at 850 ° C for 2 h with argon gas.

Embodiment 3

[0018] Mix cerium carbonate and diamond abrasive grains with water into a creamy paste and put them into a ball mill, disperse them with an alumina ball mill for 1 hour, dry the mixture at 110°C in an infrared drying oven for 4 hours, then put it into an alumina crucible, and pass it with argon Protection, roasting at 700°C for 1-8h.

[0019] Use corundum balls to mill the roasted product in a ball mill or a Raymond mill jet mill to break the joint crystals produced during the roasting process.

[0020] The obtained product cerium oxide accounts for 2.5% by mass of diamond.

[0021] Add diamond-cerium oxide core-shell composite abrasive grains into the three-dimensional mixer, add wetting agent, mix for 10 minutes, add silver powder, mix for 2 hours, add temporary adhesive, mix well, and granulate in the granulator, The granulated pellets are put into the mold and pressurized on the press to form. The formed test block was put into a high-temperature vacuum sintering furnace...

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Abstract

The invention relates to a silver-based electrical contact material and a preparation method thereof. The silver-based electrical contact material is characterized in that the material is formed by diamond-cerium oxide nuclear shell compound particles and silver. And the material is prepared by using the method comprising the following steps that: the diamond-cerium oxide nuclear shell compound particles and the silver are added into a blender mixer based on a proportion; a wetting agent is added and mixing is carried out for an uniform effect, and granulation is carried out by using a granulating machine; and a mixed material after the granulation is added into a die to carry out thermo-compression formation and nitrogen or argon filling is carried out in a vacuum sintering furnace under the temperature of 800 to 950 DEG C to protect sintering for 1 to 4 hours. According to the invention, the advantages are as follows: on the basis of granulation, particles with largely different densities are mixed uniformly; and each small particle has the identical components. The diamond-cerium oxide particles after the granulation are distributed uniformly in the electrical contact, so that the molded electrical contact material components are distributed uniformly; and thus the surface temperature is effectively reduced and the fusion welding and electrical ablation can be prevented.

Description

technical field [0001] The invention belongs to the technical field of electric contact materials, and in particular relates to a silver-based electric contact material and a preparation method thereof. Background technique [0002] Powder metallurgy electrical contact material (powder metallurgy electrical contact material) is a powder metallurgy material used in contact parts of various electrical equipment and instruments that make and break current. It transmits, withstands and disconnects the specified current to protect and control electrical appliances. Therefore, powder metallurgy electrical contact materials (hereinafter referred to as electrical contact materials) are key materials in electrical equipment and instruments. [0003] High-performance electrical contact materials generally require the following properties: good electrical and thermal conductivity, high withstand voltage characteristics, arc ablation resistance, fusion welding resistance, low current i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/023C22C1/05C22C5/06
Inventor 徐振方崔巍崔希文杨梅朱贺陈金身
Owner HENAN UNIVERSITY OF TECHNOLOGY
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