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Preparation method for optimizing copper-chromium contact by adding ultrafine grain chromium phase

A copper-chromium contact and ultra-fine-grained technology, which is applied to contacts, electrical components, circuits, etc., can solve the problems of low cooling speed, large argon gas consumption, and unsuitability for industrial mass production, so as to reduce surface resistance and improve The effect of ball milling quality and reducing ball milling resistance

Active Publication Date: 2019-10-01
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Copper-chromium alloy contacts are the core components in the field of medium-voltage vacuum switches. After years of research, it is believed that the size of the chromium phase in the metallographic structure of copper-chromium alloy contacts can be reduced, which can greatly optimize the electrical and mechanical properties of the material. At present, the mainstream preparation process of copper-chromium alloy contacts is mainly divided into two types: smelting and powder metallurgy. The copper-chromium alloy contacts prepared by conventional vacuum induction melting are generally large in size due to the low cooling rate and the central area of ​​the contact. There is a large difference in the size of the chromium phase in the edge area. Even if a more advanced arc melting process is adopted to further increase the cooling rate, the size of the chromium phase remains at 20-50um, which is still relatively large compared to the size of the arc spot in the working environment , and due to the good mechanical pro

Method used

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  • Preparation method for optimizing copper-chromium contact by adding ultrafine grain chromium phase
  • Preparation method for optimizing copper-chromium contact by adding ultrafine grain chromium phase
  • Preparation method for optimizing copper-chromium contact by adding ultrafine grain chromium phase

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Embodiment 1

[0037] (1) Ingredients

[0038] Take Cu rods, Cr blocks, and conventional Cr powder as raw materials for use, wherein the mesh number of conventional Cr powder is -80+320;

[0039] (2) Vacuum induction melting

[0040] Put the above-mentioned Cu rods and Cr blocks into the ceramic crucible in the vacuum induction melting furnace according to the ratio of 19:1 by weight, and vacuumize until the vacuum degree reaches 9×10 -1 When Pa is below, heat the ceramic crucible with gradient heating power to melt the raw material. When Cu starts to melt, turn off the vacuum system and fill it with argon or other inert gas with a purity of 99.99% until the vacuum degree is -0.08MPa At the same time, preheat the tundish, keep the power at 7KW, wait until the molten metal is completely cleared, stir evenly, and keep the superheat at 100°C according to the composition of the molten metal, and prepare for atomization;

[0041] (3) Atomized powder making

[0042] Fill the vacuum smelting sys...

Embodiment 2

[0050] (1) Ingredients

[0051] Take Cu rods, Cr blocks, and conventional Cr powder as raw materials for use, wherein the mesh number of conventional Cr powder is -80+320;

[0052] (2) Vacuum induction melting

[0053] Put the above-mentioned Cu rods and Cr blocks into the ceramic crucible in the vacuum induction melting furnace according to the ratio of 10:1 by weight, and vacuumize until the vacuum degree reaches 9×10 -1 When Pa is below, heat the ceramic crucible with gradient heating power to melt the raw materials. When Cu starts to melt, turn off the vacuum system and fill it with argon or other inert gas with a purity of 99.99% until the vacuum degree is -0.03MPa At the same time, preheat the tundish, keep the power at 25KW, wait until the molten metal is completely cleared, stir evenly, and keep the superheat at 150°C according to the composition of the molten metal, and prepare for atomization;

[0054] (3) Atomized powder making

[0055] Fill the vacuum smelting s...

Embodiment 3

[0063] (1) Ingredients

[0064] Take Cu rods, Cr blocks, and conventional Cr powder as raw materials for use, wherein the mesh number of conventional Cr powder is -80+320;

[0065] (2) Vacuum induction melting

[0066] Put the above-mentioned Cu rods and Cr blocks into the ceramic crucible in the vacuum induction melting furnace according to the ratio of 4:1 by weight, and vacuumize until the vacuum degree reaches 9×10 -1 When Pa is below, the ceramic crucible is heated by gradient heating power to melt the raw materials. When Cu starts to melt, close the vacuum system and fill it with argon or other inert gas with a purity of 99.99% until the vacuum degree is 0.02MPa. At the same time, preheat the tundish, keep the power at 45KW, wait until the molten metal is completely cleared, stir evenly, and keep the superheat at 200°C according to the composition of the molten metal, and prepare for atomization;

[0067] (3) Atomized powder making

[0068] Fill the vacuum smelting sy...

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Abstract

The invention discloses a preparation method for optimizing a copper-chromium contact by adding an ultrafine grain chromium phase, and belongs to the technical field of medium-pressure vacuum switches. The preparation method mainly comprises the following steps of (1) preparing materials; (2) carrying out vacuum induction smelting; (3) carrying out atomizing to prepare powder; (4) mixing the powder; (5) pressing and sintering; and (6) machining. According to the preparation method, the copper-chromium alloy contact is prepared by adopting a mixed powder sintering process on the basis of vacuuminduction gas atomization, and the copper-chromium alloy powder is prepared by adopting the vacuum induction gas atomization, so that a very fine chromium phase is provided for the contact, and thenconventional chromium powder is added, a copper-chromium contact meeting the requirements of chromium content is prepared by adopting a solid-phase sintering process, the contact not only avoids the excessive gas content due to the fact that chromium particles is required to be fine in a conventional production mode, the size of the chromium phase is far smaller than the size of the conventional chromium powder, and the performance of the contact is greatly optimized; and the copper-chromium contact prepared by the method is low in cost and excellent in performance, and is suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the technical field of medium-voltage vacuum switches, and in particular relates to a method for preparing copper-chromium contacts optimized by adding ultra-fine-grained chromium phases. Background technique [0002] Copper-chromium alloy contacts are the core components in the field of medium-voltage vacuum switches. After years of research, it is believed that the size of the chromium phase in the metallographic structure of copper-chromium alloy contacts can be reduced, which can greatly optimize the electrical and mechanical properties of the material. At present, the mainstream preparation process of copper-chromium alloy contacts is mainly divided into two types: smelting and powder metallurgy. The copper-chromium alloy contacts prepared by conventional vacuum induction melting are generally large in size due to the low cooling rate and the central area of ​​the contact. There is a large difference in the size of the chr...

Claims

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Application Information

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IPC IPC(8): C22C1/04H01H1/021H01H1/025B22F5/00
CPCB22F5/00B22F2998/10B22F2999/00C22C1/0425C22C1/045H01H1/021H01H1/025B22F2009/0848B22F9/082B22F1/0003B22F3/02B22F3/1007B22F2003/247B22F2201/20
Inventor 张石松刘凯王小军李鹏杨斌王文斌师晓云赵俊李刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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