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A kind of agwcc electrical contact material with special organizational structure and its preparation method

A technology of electrical contact material and tissue structure, applied in circuits, electrical switches, electrical components, etc., can solve the problems of difficult dispersion of WC reinforced phase particles, low density, and high product bulk resistance, to ensure overall contact resistance stability, Stable temperature rise/low, low cost effect

Active Publication Date: 2020-06-30
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention can solve the following problems in one or more existing technologies: (1) Due to the high current level, during the breaking process of the circuit breaker, the contacts have poor arc ablation resistance and short service life; (2) It solves the problems of small WC reinforcement phase particles (such as particle size of 1 μm), poor powder formability, low compactness, high product volume resistance, and temperature rise, and the fine WC reinforcement phase particles are difficult to disperse, and WC is easy to agglomerate (3) Solve the contradiction between the requirement of small reinforced phase particles for improving the breaking capacity and the requirement of large reinforced phase particles for batch processability

Method used

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  • A kind of agwcc electrical contact material with special organizational structure and its preparation method
  • A kind of agwcc electrical contact material with special organizational structure and its preparation method
  • A kind of agwcc electrical contact material with special organizational structure and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Taking the preparation of Ag85WC-W-C2 (silver content 85wt%) electrical contact material as an example

[0090] The first step, silver powder (D90=100nm) 0.5wt%; WC powder (D90=10nm)+W powder (D90=5μm) 94.5wt%, Ni powder (D90=50nm) 5% (wt) carries out high-energy ball milling, The ratio of W powder weight / WC powder weight is 1 / 12, the high-energy ball milling speed is 180 rpm, the ball milling time is 6 hours, and the ball-to-material ratio is 10:1.

[0091] In the second step, the composite powder obtained in the first step is mixed with silver powder, the powder mixing speed is 20 rpm, the time is 2 hours, the total silver content is 10%, and the particle size D90 of the silver powder is 100nm.

[0092]The third step is to add silver powder to the sieved powder for wet mixing, and add polyethylene glycol colloid. Acetone can be selected as the wet mixing solution medium, the ratio is total weight of powder (Kg) / volume of solution (L)=2:1, total weight of powder / total...

Embodiment 2

[0105] '" In the first step, silver powder (D90=5 μm) 5wt%; WC powder (D90=2 μm)+W powder (D90=10nm) 94.5wt%, Co powder (D90=100 μm) 0.5wt% carry out high-energy ball milling, wherein The ratio of W powder weight / WC powder weight is 1; the high-energy ball milling speed is 300 rpm, the ball milling time is 2 hours, and the ball-to-material ratio is 2:1.

[0106] In the second step, the composite powder obtained in the first step is mixed with silver powder. The rotation speed is 150 rpm, the time is 10 hours, the total silver content is 15%, and the particle size D90 of the silver powder is 5 μm.

[0107] The third step is to add silver powder to the sieved powder for wet mixing, and add polyethylene glycol colloid. Acetone can be selected as the wet mixing solution medium, the ratio is total powder weight (Kg) / solution volume (L)=1:5, total powder weight / total weight of steel balls=1:10, the speed is 300 rpm, and the time for 2 hours.

[0108] The fourth step is to dry and...

Embodiment 3

[0120] Taking the preparation of Ag75WCC3.5 (silver content 75wt%) electrical contact material as an example

[0121] In the first step, silver powder (D90=100 μm) 3wt%, WC powder (D90=10 μm) 95wt%, Co powder (D90=10 μm) 2wt% are subjected to high-energy ball milling without W powder; the speed of high-energy ball milling is 150 rpm , the ball milling time is 4 hours, and the ball-to-material ratio is 5:1.

[0122] In the second step, the composite powder obtained in the first step is mixed with silver powder. The powder mixing speed is 100 rpm, the time is 30 hours, the total silver content is 30%, and the particle size D90 of the silver powder is 100nm.

[0123] The third step is to add silver powder to the sieved powder for wet mixing, and add polyethylene glycol colloid. Acetone can be selected as the wet mixing solution medium, the ratio is total weight of powder (Kg) / volume of solution (L)=1:1, total weight of powder / total weight of steel balls=1:10, the rotation speed...

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Abstract

The invention discloses an AgWCC electric contact material with a special organization structure and a manufacturing method of the AgWCC electric contact material with the special organization structure. The manufacturing method comprises the steps that reinforced-phase WC powder or WC powder and W powder, a little silver powder and additive powder X are subjected to high-energy ball milling treatment, so that composite powder which is characterized in that silver and an additive cover the surface of the WC powder is manufactured; the composite powder and the silver powder are mixed for the first time, then wet granulation and forming operation are conducted, a blank body is subjected to degumming and infiltration in sequence after the forming operation is accomplished, and a product whichis formed after the infiltration is accomplished is broken; and the broken composite powder, the silver powder and graphite powder are mixed for the second time, sintered, granulated and formed, a blank body is sintered and pressed repeatedly after the blank body is formed, and the blank body is subjected to heat treatment after the blank body is pressed repeatedly, so that the AgWCC electric contact material with the multiple structure organization reinforcement is obtained. The AgWCC electric contact material comprises a cobblestone-shaped organization and / or a uniformly dispersed organization. The AgWCC electric contact material is low in resistivity, has the high compactness, is high in material disjunction performance and has the long electric life.

Description

technical field [0001] The invention relates to an electrical contact material and a preparation method thereof, in particular to a preparation method of an AgWCC electrical contact material with a special organizational structure and the AgWCC electrical contact material prepared by the method. Background technique [0002] As a basic product in the national economy, low-voltage electrical appliances are widely used in various fields such as residential buildings, industrial production, aerospace, automobiles, rail transit, household appliances, electric tools, industrial and consumer electronic equipment, and public electricity. The circuit breaker is a distribution appliance widely used in low-voltage power distribution terminals, which undertakes the function of short-circuit and overload breaking protection of the power supply network. AgWCC is widely used in medium frame circuit breakers, molded case circuit breakers, etc. because of its good electrical conductivity, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06C22C32/00C22C1/05C22C1/10B22F9/04B22F3/10B22F3/24H01H11/04
CPCB22F3/1007B22F3/24B22F9/04B22F2003/248C22C1/05C22C5/06C22C32/0047H01H11/048
Inventor 穆成法杨辉
Owner ZHEJIANG UNIV
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