Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of metal chromium powder special for high-performance CuCr electrical contact

A technology of metal chromium powder and electrical contacts, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high oxygen content of CuCr contacts, too fine particle size of chromium powder, increased oxygen content of chromium powder, etc., to achieve moist Good wettability, low oxygen content, good formability

Active Publication Date: 2019-09-06
SIRUI ADVANCED COPPER ALLOY CO LTD
View PDF9 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the ball milling process, the material is between the grinding balls that are strongly stirred, and is subjected to the repeated action of impact force, grinding force, shear force and pressure, so that it is continuously deformed, broken and cold welded. This method can be directly used To produce brittle and hard metal or oxide powder; at the same time, it can also deal with the agglomeration of reduction metal powder, atomized powder or electrolytic powder; however, the oxygen content of chromium powder increases after ball milling, resulting in the oxygen content of CuCr contact Higher; 3. Fluidized bed airflow milling method: The material particles are accelerated by compressed gas in the fluidized bed, and are micronized due to the high-speed particle-particle collision. This method can effectively crush the metal powder to 11μm Below, the average particle size is 3.5μm, and the particle size of chromium powder prepared by fluidized bed jet milling method is too fine to be used for CuCr contacts

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
  • Preparation method of metal chromium powder special for high-performance CuCr electrical contact
  • Preparation method of metal chromium powder special for high-performance CuCr electrical contact
  • Preparation method of metal chromium powder special for high-performance CuCr electrical contact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: a kind of preparation method of high-performance CuCr electric contact special metal chromium powder, comprises the following steps:

[0021] (1) Broken, put the chromium block into the crusher, and the chromium block is broken into granular form; the granular chromium block is screened with a 10mm aperture screen, and the chromium particles under the sieve are selected, and the chromium particle size is 10mm; use this particle size range Chromium particles are mainly for the convenience of the next grinding process;

[0022] (2) Grinding, vacuumize the low-temperature grinding and pulverizing equipment, and keep the vacuum at -0.08Mpa to prevent the chromium particles from being oxidized. Add the chromium particles to the low-temperature grinding and pulverizing equipment, and then pass in the cooling medium, which is cryogenic liquid Nitrogen, the temperature is controlled at -30°C to obtain metal chromium powder;

[0023] (3) sieve, metal chromium powd...

Embodiment 2

[0025] Embodiment 2: a kind of preparation method of metal chromium powder special for high-performance CuCr electric contact, comprises the following steps:

[0026] (1) Broken, put the chromium block into the crusher, and the chromium block is broken into granular form; the granular chromium block is screened with a 10mm aperture sieve, and the chromium particles under the sieve are selected, and the chromium particle size is 9mm; use this particle size range Chromium particles are mainly for the convenience of the next grinding process;

[0027] (2) Grinding, vacuumize the low-temperature grinding and pulverizing equipment, and keep the vacuum at -0.10Mpa to prevent the chromium particles from being oxidized. Lower the temperature of the cooling medium to reach the embrittlement temperature of the corresponding chromium particles, and then pass in the cooling medium, the cooling medium is low-temperature liquid nitrogen, the temperature is controlled at -45°C, and the crush...

Embodiment 3

[0030] Embodiment 3: a kind of preparation method of metal chromium powder special for high-performance CuCr electric contact, comprises the following steps:

[0031] (1) Broken, put the chromium block into the crusher, and the chromium block is broken into granular form; the granular chromium block is screened with a 10mm aperture screen, and the chromium particles under the sieve are selected, and the chromium particle size is 9mm; use this particle size range Chromium particles are mainly for the convenience of the next grinding process;

[0032] (2) Grinding, vacuumize the low-temperature grinding and pulverizing equipment, and keep the vacuum at -0.11Mpa to prevent the chromium particles from being oxidized. Lower the temperature of the cooling medium to reach the embrittlement temperature of the corresponding chromium particles, and then pass in the cooling medium, the cooling medium is low-temperature liquid nitrogen, the temperature is controlled at -75°C, and the crus...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of metal chromium powder special for a high-performance CuCr electrical contact. The preparation method comprises the steps of crushing, specifically, a chromium block is placed into a crusher and crushed into granules; screening the granulated chromium block by using a 10-mm aperture screen, and selecting undersize chromium particles; grinding, specifically, the chromium particles are added into low-temperature grinding powder manufacturing equipment, and a cooling medium is introduced to obtain the metal chromium powder; screening again, specifically, the metal chromium powder is respectively screened by using a 200-mesh screen, a 240-mesh screen and a 320-mesh screen; and detecting, specifically, oxygen content in the metal chromium powder isanalyzed by using a nitrogen-oxygen analyzer and is required to be no greater than 600 ppm. According to the preparation method of the metal chromium powder, the oxygen content in the chromium powdercan be effectively controlled; and the chromium powder is not prone to segregation after being mixed with Cu powder, has good formability, and has good wettability of Cr and Cu after sintered.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a method for preparing a special metal chromium powder for high-performance CuCr electric contacts. Background technique [0002] Chromium is an important alloying element, which is widely used in industry. 15% is used in the production of chemical raw materials and dyes in the chemical industry; 10% is used in high temperature resistance and foundry industries, such as the production of superalloys, electrothermal alloys, precision alloys, stainless steel, etc.; 75% is used in the metallurgical industry to produce highly corrosion-resistant electroplated metal parts, steel, etc. [0003] Copper-chromium contact material is one of the most important medium-voltage high-power vacuum switch contact materials. Metal chromium is an essential material in copper-chromium contacts. The impurity content in metal chromium has a great influence on copper-chromium contact...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00
CPCB22F9/04B22F2009/049B22F1/142
Inventor 闫利平郭创立聂红锋朱金泽杨红艳孙刚刚梁建斌王文斌
Owner SIRUI ADVANCED COPPER ALLOY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com