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Structure optimization method for vacuum consumable electric arc smelting copper-chromium contact material

A vacuum consumable arc, copper-chromium contact technology, applied in the direction of contacts, circuits, electrical switches, etc., can solve the problems affecting the voltage resistance, breaking and anti-welding electrical properties of contact materials, and coarse metallographic structure. To achieve the effect of improving safety, reliability and protection, improving electrical performance, and promoting progress and development

Pending Publication Date: 2021-08-24
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the vacuum consumable arc melting process is used to prepare copper-chromium series contact materials, the chromium powder and the irregular geometric dimensions of the electrode rods will cause obvious coarse microstructures in the metallographic structure after smelting, and the elements The enriched area affects the electrical properties of the contact material such as pressure resistance, breaking and anti-welding

Method used

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  • Structure optimization method for vacuum consumable electric arc smelting copper-chromium contact material
  • Structure optimization method for vacuum consumable electric arc smelting copper-chromium contact material
  • Structure optimization method for vacuum consumable electric arc smelting copper-chromium contact material

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Embodiment 1

[0029] Embodiment 1: A method for optimizing the structure of copper-chromium contact material in vacuum consumable arc melting, comprising the following steps:

[0030] S1. Ingredients

[0031] According to the alloy composition of technological requirement, take by weight percentage respectively the copper powder of 45% and the chromium powder of 55%;

[0032] S2, sintering

[0033] S2-1. Fully mix the copper powder and chromium powder in step S1, and carry out compaction treatment under the condition of vacuum degree of 40Pa and pressure of 300KN, place the compacted alloy powder in a sintering furnace, and heat Sintering treatment under the conditions for 5h, to obtain the master alloy;

[0034] S2-2. Put the master alloy obtained in step S2-1 into the graphite crucible of the melting chamber, and fill the melting chamber with N 2 As a protective gas, heat the graphite crucible until the copper powder and chromium powder are completely melted, and after 10 minutes of he...

Embodiment 2

[0039] Embodiment 2: A method for optimizing the structure of copper-chromium contact material in vacuum consumable arc melting, comprising the following steps:

[0040] S1. Ingredients

[0041] According to the alloy composition required by the process, 70% copper powder and 30% chromium powder were weighed in weight percentage; the copper powder is derived from electrolytic copper powder;

[0042] S2, sintering

[0043] S2-1. Fully mix the copper powder and chromium powder in step S1, and carry out compaction treatment under the conditions of vacuum degree of 70Pa and pressure of 400KN, place the compacted alloy powder in a sintering furnace, and heat Sintering treatment under the conditions for 7h to obtain the master alloy;

[0044] S2-2. Put the master alloy obtained in step S2-1 into the graphite crucible of the melting chamber, and fill the melting chamber with N 2 As a protective gas, heat the graphite crucible until the copper powder and chromium powder are complet...

Embodiment 3

[0049] Embodiment 3 A method for optimizing the microstructure of copper-chromium contact material in vacuum consumable arc melting, comprising the following steps:

[0050] S1. Ingredients

[0051] According to the alloy composition required by the process, 90% of the copper powder and 10% of the chromium powder are weighed in percentage by weight;

[0052] S2, sintering

[0053] S2-1. Fully mix the copper powder and chromium powder in step S1, and carry out compaction treatment under the conditions of vacuum degree of 90Pa and pressure of 500KN, place the compacted alloy powder in a sintering furnace, and heat Sintering treatment under conditions for 8 hours to obtain an intermediate alloy;

[0054] S2-2, put the master alloy obtained in step S2-1 into the graphite crucible of the melting chamber, and fill the melting chamber with N 2 As a protective gas, heat the graphite crucible until the copper powder and chromium powder are completely melted, and after heat preservat...

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Abstract

The invention discloses a structure optimization method for a vacuum consumable electric arc smelting copper-chromium contact material. The method comprises the steps of S1, burdening, wherein copper powder and chromium powder are weighed; S2, sintering, wherein firstly, the copper powder and the chromium powder are fully mixed to be uniform, vacuum compaction sintering treatment is carried out, an intermediate alloy is obtained, then, the intermediate alloy is subjected to smelting and atomization powder making treatment, alloy powder is obtained, and finally, the alloy powder is sintered to obtain a consumable electrode bar; and S3, vacuum consumable smelting, wherein the consumable electrode bar is smelted in a vacuum consumable electric arc smelting furnace, and the copper-chromium contact material is obtained after cooling. The copper-chromium contact material prepared through the method is uniform in metallographic structure, and the fusion welding resistance and the segmentation capacity of the contact material are further improved.

Description

technical field [0001] The invention relates to the technical field of alloy material preparation, in particular to a method for optimizing the microstructure of a copper-chromium contact material for vacuum consumable arc melting. Background technique [0002] Among the four preparation technologies of CuCr contact materials in the world: vacuum infiltration, powder mixing sintering, vacuum casting, and arc melting, the vacuum infiltration process contacts have been gradually eliminated due to their own coarse structure and uneven distribution; powder mixing Sintered contacts are used in a small amount in vacuum switches with low contact pressure due to their high resistance to welding; while vacuum cast contacts are widely used in vacuum switches at home and abroad due to their high breaking performance, accounting for About 40% of the world; and the vacuum consumable arc melting process, due to the expiration of the German Siemens patent, Shaanxi Sirui New Materials Co., ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/20C22B9/04C22B9/02C22C1/03C22C1/04C22C9/00C22C27/06B22D27/04B22F9/08H01H1/021H01H1/025H01H11/04
CPCC22B9/20C22B9/04C22C9/00C22C27/06C22C1/0425C22C1/045C22C1/03B22F9/082C22B9/026B22D27/04B22D27/003H01H1/025H01H1/021H01H11/04Y02P10/20
Inventor 李鹏王小军张石松刘凯杨斌屈晓鹏王文斌
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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