Manufacturing method for large-size high-density high-uniformity CuCr alloy

A manufacturing method and high-density technology are applied in the manufacturing field of copper-based vacuum contact materials to achieve the effects of improving current density distribution, simple process and accelerating gas discharge

Active Publication Date: 2017-03-15
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from this that the method of patent 106086493A adopting rapid heating (heating rate of 50-300°C / min) is not suitable for preparing large-sized CuCr alloys with high density and high uniformity (diameter greater than 50mm)

Method used

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  • Manufacturing method for large-size high-density high-uniformity CuCr alloy
  • Manufacturing method for large-size high-density high-uniformity CuCr alloy
  • Manufacturing method for large-size high-density high-uniformity CuCr alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The large-size CuCr alloy of this embodiment is carried out as follows:

[0034] Step 1. Weigh 7.0 kg of Cu powder and 3.0 kg of Cr powder, and mix for 10 hours by mechanical mixing to obtain uniform CuCr mixed powder; weigh 3.35 kg of CuCr mixed powder for sintering;

[0035] Step 2. Fill the weighed CuCr mixed powder into the graphite mold; use a manual hydraulic press to pre-press the graphite mold with the CuCr mixed powder, and the pressure is ~10MPa;

[0036] Step 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold with CuCr mixed powder, then place it in the hearth of the spark plasma sintering system, evacuate it to below 5Pa, pass a DC pulse current, and mix the CuCr The powder is consolidated and formed, and the process conditions are:

[0037] The axial pressure is 30MPa;

[0038] The heating rate is 15℃ / min(≤300℃) and 35℃ / min(> 300℃);

[0039] The sintering temperature is 850℃;

[0040] Holding time is 5min;

[0041] After cooling in the furnace, a CuCr...

Embodiment 2

[0043] The large-size CuCr alloy of this embodiment is carried out as follows:

[0044] Step 1. Weigh 14.0kg of Cu powder and 6.0kg of Cr powder, and mix for 10h by mechanical mixing method to obtain uniform CuCr mixed powder; Weigh 5.66kg of CuCr mixed powder for sintering;

[0045] Step 2. Fill the weighed CuCr mixed powder into the graphite mold; use a manual hydraulic press to pre-press the graphite mold with the CuCr mixed powder, and the pressure is ~10MPa;

[0046] Step 3. Wrap ~5mm thick carbon felt on the periphery of the graphite mold with CuCr mixed powder, then place it in the hearth of the spark plasma sintering system, evacuate it to below 5Pa, pass a DC pulse current, and mix the CuCr The powder is consolidated and formed, and the process conditions are:

[0047] The axial pressure is 60MPa;

[0048] The heating rate is 10℃ / min(≤300℃) and 30℃ / min(> 300℃);

[0049] The sintering temperature is 800℃;

[0050] Holding time is 8min;

[0051] After cooling in the furnace, a cyli...

Embodiment 3

[0053] The large-size CuCr alloy of this embodiment is carried out as follows:

[0054] Step 1. Weigh 7.0kg of Cu powder and 3.0kg of Cr powder, and mix for 10h by mechanical mixing method to obtain uniform CuCr mixed powder; Weigh 655g CuCr mixed powder for sintering;

[0055] Step 2. Fill the weighed CuCr mixed powder into the graphite mold; use a manual hydraulic press to pre-press the graphite mold with the CuCr mixed powder, and the pressure is ~10MPa;

[0056] 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 to below 5Pa, and then pass a DC pulse current to CuCr The mixed powder is consolidated and formed, and the process conditions are:

[0057] The axial pressure is 10MPa;

[0058] The heating rate is 20℃ / min(≤300℃) and 50℃ / min(> 300℃);

[0059] The sintering temperature is 880℃;

[0060] Holding time is 2min;

[0061] After cooling in the furnace, a CuCr al...

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Abstract

The invention discloses a manufacturing method for a large-size high-density high-uniformity CuCr alloy. The manufacturing method is characterized in that CuCr mixed powder is solidified and formed through discharge plasma sintering, by optimizing a sintering die structure, the temperature is increased to 800 DEG C to 880 DEG C through a step heating manner at 10 DEG C / min to 50 DEG C / min and then kept for 2 minutes to 8 minutes while axial mechanical pressure is applied, and a sintered cylinder ingot with the diameter not smaller than 50 mm, the long diameter ratio of 0.04-1.0, the density larger than 99.0%, axial and radial fluctuation less than 1% and an uniform component structure can be obtained. According to the manufacturing method, different sintering conditions can be selected according to the size demand of the CuCr alloy, the process is simple, the period is short, the production efficiency is high, and the obtained CuCr alloy can be made into a finished product through a small amount of subsequent machining and then used as a part of a vacuum circuit breaker in large-power transmission and transformation equipment.

Description

Technical field [0001] The invention relates to a method for manufacturing a copper-based vacuum contact material, in particular to a method for manufacturing a CuCr alloy with large size, 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 resistance to arc erosion and good breaking current. The performance of CuCr alloy mainly depends on the compactness and uniformity of its structure. Due to the low mutual solubility between Cu and Cr and poor wettability, in the development of CuCr alloys for a long time, a porous Cr framework with a certain shape was prepared by powder metallurgy, and then Cu was infiltrated to obtain CuCr Alloy products; if necessary, cold or hot repressing the CuCr alloy after infiltration to make the product meet the required density and strength. [0003] So far, CuCr alloy manufacturing methods mainly include infiltration me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C9/00B22F3/14
CPCB22F3/14B22F2998/10C22C1/0425C22C9/00B22F1/0003B22F3/02
Inventor 张久兴韩翠柳胡可杨新宇刘凯王小军师晓云杨平
Owner HEFEI UNIV OF TECH
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