Method for manufacturing high-compactness high-uniformity CuCr alloy in batch

A manufacturing method and high-density technology, which is applied in the field of batch manufacturing of CuCr alloys, can solve the problems of powder metallurgy batch molding of CuCr alloys, etc., to improve the uniformity of current and heat distribution, improve quality and production efficiency, and shorten the cycle Effect

Inactive Publication Date: 2017-12-22
SHAANXI SIRUI ADVANCED MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, Chinese patent CN106498205A discloses a method for manufacturing CuCr alloy with large size, high density and high uniformity. This patent manufactures large-sized, high-density alloys by rationally designing mold and indenter structures, improving current distribution, and selecting appropriate sintering parameters. CuCr alloy with high density and uniformity, but this patent can only form one CuCr alloy cylindrical ingot at a time, which cannot realize the powder metallurgy batch forming of CuCr alloy

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  • Method for manufacturing high-compactness high-uniformity CuCr alloy in batch
  • Method for manufacturing high-compactness high-uniformity CuCr alloy in batch
  • Method for manufacturing high-compactness high-uniformity CuCr alloy in batch

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Embodiment 1

[0033] The graphite female mold of the graphite mold used in this embodiment contains 3 mold cavities.

[0034] The sintering of the one-die three-cavity CuCr alloy of the present embodiment is carried out as follows:

[0035] Step 1. Weigh 2.8kg of Cu powder and 1.2kg of Cr powder respectively, and mix them by mechanical mixing method for 10h to obtain uniform CuCr mixed powder; weigh three parts of 1.15kg CuCr mixed powder for sintering;

[0036] Step 2. Fill the weighed CuCr mixed powder into three mold cavities of the graphite mold successively in batches; use a manual hydraulic press to pre-press the graphite mold filled with the CuCr mixed powder, and the pressure is 10MPa;

[0037] Step 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold with CuCr mixed powder, then place it in the furnace of the spark plasma sintering system, evacuate it to below 5Pa, and feed DC pulse current to mix CuCr The powder is consolidated and formed, and the process conditio...

Embodiment 2

[0044] The graphite female mold of the graphite mold used in the present embodiment contains 5 mold cavities.

[0045] The sintering of CuCr alloy with one mold and five cavities of the present embodiment is carried out according to the following steps:

[0046] Step 1. Weigh 2.24g of Cu powder and 0.96kg of Cr powder respectively, and mix them for 10 hours by mechanical mixing method to obtain uniform CuCr mixed powder; weigh five parts of 629g CuCr mixed powder for sintering;

[0047] Step 2. Fill the weighed CuCr mixed powder into five mold cavities of the graphite mold successively in batches; use a manual hydraulic press to pre-press the graphite mold filled with the CuCr mixed powder, and the pressure is 10MPa;

[0048] Step 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold with CuCr mixed powder, then place it in the furnace of the spark plasma sintering system, evacuate it to below 5Pa, and feed DC pulse current to mix CuCr The powder is consolidate...

Embodiment 3

[0055] The graphite female mold of the graphite mold used in the present embodiment contains 7 mold cavities.

[0056] The sintering of CuCr alloy with one mold and seven cavities of the present embodiment is carried out according to the following steps:

[0057] Step 1. Weigh 1.47kg of Cu powder and 0.63kg of Cr powder respectively, and mix them for 10 hours by mechanical mixing method to obtain uniform CuCr mixed powder; weigh seven parts of 295g CuCr mixed powder for sintering;

[0058] Step 2, filling the weighed CuCr mixed powder into 7 mold cavities of the graphite mold successively in batches; using a manual hydraulic press to pre-press the graphite mold filled with the CuCr mixed powder, the pressure is 10MPa;

[0059] Step 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold with CuCr mixed powder, then place it in the furnace of the spark plasma sintering system, evacuate it to below 5Pa, and then pass a DC pulse current to the CuCr The mixed powder ...

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Abstract

The invention discloses a method for manufacturing high-compactness high-uniformity CuCr alloy in batch. A graphite die with multiple cavities is adopted, CuCr mixed power is solidified and formed by spark plasma sintering, the structure of a sintering die is optimized, heating is performed to 830-860 DEG C at a speed of 20-30 DEG C / min while an axial mechanical pressure of 10-30MPa is performed in step and then heat preservation is performed for 3-6min, such that a plurality of sintering cylindrical ingots of which a draw ratio is 0.1-2.0, the compactness is 98.0%, axial and radial fluctuations are smaller than 1%, component tissues are uniform and an oxygen content is low can be manufactured in batch at one step. Different die structures can be designed and different sintering conditions can be selected according to size requirements of the CuCr alloy, the process is simple, the period is short, the production efficiency is high, and the obtained CuCr alloy can be formed into finished products by a small amount of subsequent machining to serve as parts of a vacuum circuit breaker in a large power transmission and transformation device.

Description

technical field [0001] The invention relates to a powder metallurgy batch manufacturing method of copper-based vacuum contact materials, in particular to a batch manufacturing method of CuCr alloy with high density and high uniformity. Background technique [0002] CuCr alloy is widely used as a contact material in medium and high voltage vacuum circuit breakers because of its good arc corrosion resistance and good breaking current capability. The performance of CuCr alloy mainly depends on the compactness and uniformity of its structure. Because the mutual solubility between Cu and Cr is very low and the wettability is poor, for a long time in the development of CuCr alloys, the powder metallurgy method was first used to prepare a porous Cr skeleton with a certain shape, and then infiltrated Cu to obtain CuCr. Alloy products; if necessary, cold or hot repress the infiltrated CuCr alloy to make the product meet the required density and strength. Therefore, limited by the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/04
CPCC22C9/00C22C1/0425
Inventor 王文斌师晓云刘凯艾璇王小军杨平张久兴胡可韩翠柳高思远杨新宇
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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