Preparation method of copper-chromium contact material

A copper-chromium contact and copper powder technology, which is used in contacts, electrical components, circuits, etc., can solve the problems of poor contact resistance welding performance, low contact mechanical strength, and low contact material density. Good material density, good copper infiltration effect, and sufficient capillary action

Inactive Publication Date: 2018-11-06
SHAANXI ZHONGTIAN ROCKET TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current powder metallurgy method is easy to form pores, so that the density of the contact material is low. The contact prepared by this process has low mechanical strength and poor compressive strength.
The vacuum casting method makes the material easy to be mixed with the material of the melting crucible, and the tensile strength of the material is high, which makes the anti-welding performance of the contact worse

Method used

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  • Preparation method of copper-chromium contact material
  • Preparation method of copper-chromium contact material
  • Preparation method of copper-chromium contact material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] First, 10 grams of copper powder and 40 grams of chromium powder were ball milled for 7 hours under vacuum conditions with a vacuum degree of 0.06 MPa to obtain ball milling powder; then 50 grams of copper powder and ball milling powder were added to mix evenly to obtain a mixed powder; Sieve, disperse and place in containers to dry. Press the obtained mixed powder on a 100-ton four-column hydraulic press with a mold diameter of 36 cm and a pressure of 340 MPa for 5 seconds to form a compact; put the compact into a graphite crucible, place a copper sheet on it, and place the compact in a 0.1 Pa vacuum sintering furnace medium sintering. The sintering temperature is 870 degrees centigrade, and the time is 5 hours; the obtained sintered product is further heated to 1200 degrees centigrade in a vacuum sintering furnace for infiltration, and the time is 10 minutes. Vacuum annealing at 600°C for 7 hours to obtain a CuCr30 contact material.

[0032] figure 1 It is a TEM ph...

Embodiment 2

[0034] First, 15 grams of copper powder and 40 grams of chromium powder were ball milled for 7 hours under vacuum conditions with a vacuum degree of 0.06 MPa to obtain ball milling powder; then 45 grams of copper powder and ball milling powder were added to mix evenly to obtain a mixed powder; Sieve, disperse and place in containers to dry. Press the obtained mixed powder on a 100-ton four-column hydraulic press with a mold diameter of 36 cm and a pressure of 340 MPa for 5 seconds to form a compact; put the compact into a graphite crucible, place a copper sheet on it, and place the compact in a 0.1 Pa vacuum sintering furnace medium sintering. The sintering temperature is 870 degrees centigrade, and the time is 5 hours; the obtained sintered product is further heated to 1200 degrees centigrade in a vacuum sintering furnace for infiltration, and the time is 10 minutes. Vacuum annealing at 600°C for 7 hours to obtain a CuCr30 contact material.

[0035] In this embodiment, the ...

Embodiment 3

[0037] Take by weighing 20 grams of induced copper powder and 40 grams of chromium powder respectively, under vacuum conditions, vacuum degree is 0.06MPa, ball mill 7 hours, obtain ball mill powder; Add 40 grams of copper powder and ball mill powder and mix evenly, obtain mixed powder; The powder is sieved, dispersed and placed in containers to dry. Press the obtained mixed powder on a 100-ton four-column hydraulic press with a mold diameter of 36 cm and a pressure of 340 MPa for 5 seconds to form a compact; put the compact into a graphite crucible, place a copper sheet on it, and place the compact in a 0.1 Pa vacuum sintering furnace medium sintering. The sintering temperature is 870 degrees centigrade, and the time is 5 hours; the obtained sintered product is further heated to 1200 degrees centigrade in a vacuum sintering furnace for infiltration, and the time is 10 minutes. Vacuum annealing at 600°C for 7 hours to obtain a CuCr30 contact material.

[0038] In this embodim...

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Abstract

The invention belongs to the field of contact material manufacturing and particularly relates to a preparation method of a copper-chromium contact material. The preparation method comprises the following steps of mixing a part of copper powder as inductive copper powder with chromium powder, conducting ball milling to obtain ball-milled powder under the vacuum condition, adding the remaining copper powder to be mixed evenly to obtain mixed powder; pressing the mixed powder into a blank, pulling the pressed blank into a crucible and putting a copper sheet on the pressed blank; putting the crucible in a vacuum sintering furnace to be sintered and infiltrated and obtaining the copper-chromium contact material after annealing, wherein the chromium content of the material is 25-50 wt%. The copper-chromium contact material prepared through solid phase sintering and liquid phase copper infiltration is uniform in structure. Cr particles are nearly spherical and small in size. The material is good in compactness and low in gas content.

Description

technical field [0001] The invention belongs to the field of contact material manufacturing, and in particular relates to a preparation method of a copper-chromium contact material. Background technique [0002] Copper-chromium contact material is one of the most important medium-voltage high-power vacuum switch contact materials. At present, the preparation methods of copper-chromium contact materials are mainly powder metallurgy (including powder sintering method and infiltration method) and vacuum casting method. However, the current powder metallurgy method is easy to form pores, which makes the density of the contact material low. The contact prepared by this process has low mechanical strength and poor compressive strength. The vacuum casting method makes the material easy to be mixed with the material of the melting crucible, and the tensile strength of the material is high, which makes the anti-welding performance of the contact worse. Therefore, how to prepare a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F3/10B22F3/24C22C9/00C22C1/04H01H1/025
CPCB22F3/1007B22F3/1035B22F3/24B22F9/04B22F2003/248B22F2009/043B22F2998/10B22F2999/00C22C1/0425C22C9/00H01H1/025B22F3/02B22F2201/20
Inventor 王战军张娟卓飞曹兆红孙平权高波邵立峰李秦巍
Owner SHAANXI ZHONGTIAN ROCKET TECH CO LTD
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