CN-121983452-A - Technological method for improving pressure resistance of copper-chromium contact prepared by vacuum casting base material

CN121983452ACN 121983452 ACN121983452 ACN 121983452ACN-121983452-A

Abstract

The invention belongs to the technical field of electric materials, and discloses a process method for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a base material, which comprises the following steps: the method comprises the steps of preparing copper-chromium contact parts, performing pressure resistance test, recording pressure resistance results, performing solid solution and aging treatment on the copper-chromium contact parts, performing fine grinding treatment on the solid solution and aging treatment copper-chromium contact parts, covering industrial alcohol on the surfaces of the ultrasonic treatment copper-chromium contact parts, performing ultrasonic treatment, placing the ultrasonic treatment copper-chromium contact parts into a temperature constant-temperature box for drying, performing pressure resistance test, and recording pressure resistance test results.

Inventors

LI BAOZENG
YIN KAIYANG
LI PENGFEI
NAN YAMING
JIN YANTAO
ZHU WENTONG
ZHOU ZHONGQUAN

Assignees

平顶山学院

Dates

Publication Date: 20260505
Application Date: 20231227

Claims (10)

1. The process method for improving the pressure resistance of the copper-chromium contact prepared by vacuum casting base materials is characterized by comprising the following steps of: s1, preparing a copper-chromium contact part; S2, performing pressure resistance test on the copper-chromium contact part prepared in the step S1 under preset conditions, and recording pressure resistance results; S3, under the condition that the vacuum degree is higher than the preset vacuum degree, carrying out solid solution and aging treatment on the copper-chromium contact part for a first preset time period in a first preset temperature range, homogenizing a grain structure, and improving the hardness and the conductivity of the copper-chromium contact part; s4, selecting the granularity of abrasive particles, and carrying out fine grinding treatment on the copper-chromium contact part subjected to solid solution and aging treatment, so as to reduce the surface roughness of the copper-chromium contact part; s5, covering industrial alcohol on the surface of the copper-chromium contact part subjected to ultrasonic treatment, wherein the covering depth is 10mm, carrying out ultrasonic treatment on the copper-chromium contact part subjected to fine grinding treatment, carrying out ultrasonic vibration for 10min, removing foreign matters on the surface of the copper-chromium contact part, and taking out the copper-chromium contact part through a wood frame after ultrasonic treatment; S6, after the copper-chromium contact part is taken out, placing the copper-chromium contact part into a constant temperature box with the temperature of a second preset temperature, and drying for a second preset time period; And S7, performing pressure resistance test under preset conditions, and recording pressure resistance test results.
2. The process for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the copper-chromium contact component comprises a CuCr25 contact component, a CuCr30 contact component, a CuCr35 contact component, a CuCr40 contact component, a CuCr45 contact component and a CuCr50 contact component.
3. The method for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the preset vacuum degree comprises 6X 10 -3 Pa.
4. The process for improving the pressure resistance of the copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the preset temperature is 850-980 ℃.
5. The method for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the first preset time period comprises 4 hours.
6. The method for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the second preset temperature is 30+/-0.5 ℃.
7. The process for improving the pressure resistance of the copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the second preset time period is 30 minutes.
8. The method for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the foreign matters comprise metal particle foreign matters and abrasive grain foreign matters.
9. The process for improving the pressure resistance of the copper-chromium contact prepared by vacuum casting a substrate according to claim 1, wherein the preset condition is that the opening distance is 4mm, and the testing time is 1min.
10. The process for improving the pressure resistance of copper-chromium contacts prepared by vacuum casting a substrate according to claim 1, wherein the abrasive particles have a particle size Ra2.

Description

Technological method for improving pressure resistance of copper-chromium contact prepared by vacuum casting base material Technical Field The invention belongs to the technical field of electric materials, and particularly relates to a process method for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a base material. Background The vacuum circuit breaker is connected and disconnected by means of copper-chromium moving and static contacts, the breakdown performance of the gap is mainly closely related to the material composition, microstructure, part structure, shape, surface roughness, cleanliness and the like of electrodes, at present, most of the copper-chromium moving and static contacts of the vacuum circuit breaker are manufactured into raw materials through a vacuum casting method, then machining is completed, the internal structure is relatively coarse, the surface is relatively coarse, when a circuit is disconnected, an arc is easy to start in a copper phase, the internal structure is coarse, the arcing position is relatively few, the local arcing current is relatively large, burning loss is easy to occur, a protruding tip appears in the surface roughness, discharge is very easy to occur, and therefore the breakdown voltage is relatively low in the disconnection process. Disclosure of Invention The invention aims to provide a process method for improving the pressure resistance of a copper-chromium contact prepared by vacuum casting a substrate, so as to solve the problems in the prior art. In order to achieve the aim, the invention provides the following technical scheme that the process method for improving the pressure resistance of the copper-chromium contact prepared by vacuum casting a substrate comprises the following steps: s1, preparing a copper-chromium contact part; S2, performing pressure resistance test on the copper-chromium contact part prepared in the step S1 under preset conditions, and recording pressure resistance results; S3, under the condition that the vacuum degree is higher than the preset vacuum degree, carrying out solid solution and aging treatment on the copper-chromium contact part for a first preset time period in a first preset temperature range, homogenizing a grain structure, and improving the hardness and the conductivity of the copper-chromium contact part; s4, selecting the granularity of abrasive particles, and carrying out fine grinding treatment on the copper-chromium contact part subjected to solid solution and aging treatment, so as to reduce the surface roughness of the copper-chromium contact part; s5, covering industrial alcohol on the surface of the copper-chromium contact part subjected to ultrasonic treatment, wherein the covering depth is 10mm, carrying out ultrasonic treatment on the copper-chromium contact part subjected to fine grinding treatment, carrying out ultrasonic vibration for 10min, removing foreign matters on the surface of the copper-chromium contact part, and taking out the copper-chromium contact part through a wood frame after ultrasonic treatment; S6, after the copper-chromium contact part is taken out, placing the copper-chromium contact part into a constant temperature box with the temperature of a second preset temperature, and drying for a second preset time period; And S7, performing pressure resistance test under preset conditions, and recording pressure resistance test results. Preferably, the copper-chromium contact component comprises a CuCr25 contact component, a CuCr30 contact component, a CuCr35 contact component, a CuCr40 contact component, a CuCr45 contact component, and a CuCr50 contact component. Preferably, the preset vacuum degree includes 6×10 -3 Pa. Preferably, the preset temperature comprises 850-980 ℃. Preferably, the first preset time period includes 4 hours. Preferably, the second preset temperature comprises 30±0.5 ℃. Preferably, the second preset time period is 30min. Preferably, the foreign matter includes metal particle foreign matter and abrasive particle foreign matter. Preferably, the preset condition is that the distance is 4mm, and the testing duration is 1min. Preferably, the abrasive particles have a particle size Ra2. Compared with the prior art, the invention has the beneficial effects that: the method treats the copper-chromium contact, homogenizes the internal grain structure of the copper-chromium contact through solid solution aging, fine grinding, ultrasonic and drying treatment, obviously reduces the surface roughness of the contact, improves the surface quality of the contact, improves the withstand voltage level of parts, and keeps the surface roughness less than or equal to Ra2, thereby improving the breakdown voltage of the parts. Drawings FIG. 1 is a flow chart of the present invention. Detailed Description The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanyin