Preparation method of CuCr alloy powder with low chromium content

A technology of alloy powder and chromium content, applied in the field of preparation of CuCr alloy powder, can solve the problems of introducing impurities, etc., and achieve the effects of easy powder sintering, refinement of solidified structure, and reduction of Cr phase composition segregation

Inactive Publication Date: 2012-04-25
XIAN UNIV OF TECH
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  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing CuCr alloy powder with low chromium co

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  • Preparation method of CuCr alloy powder with low chromium content
  • Preparation method of CuCr alloy powder with low chromium content
  • Preparation method of CuCr alloy powder with low chromium content

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[0023] The invention provides a method for preparing CuCr alloy powder with low chromium content. The CuCr alloy powder is prepared by gas atomization technology. The method is implemented according to the following steps:

[0024] Step 1, raw material weighing

[0025] Weighing 99-95% of the Cu block and 1-5% of the Cr particles according to the mass percentage, the sum of the mass percentages of Cu and Cr is 100%, and the particle size of the Cr particles is 1-4mm;

[0026] Step 2, Smelting

[0027] First bake the medium frequency induction furnace, then put the Cu block weighed in step 1 into the graphite crucible, and put them into the induction furnace together, adjust the power of the induction furnace to 200-240KW, the frequency to 1000-1200Hz, and quickly heat up to The melting point of Cu is to melt the Cu block, and then add the Cr particles weighed in step 1, and then add the slagging agent and covering agent in sequence. The slagging agent is potassium fluozircon...

Embodiment 1

[0031] Take by weighing 97% of the Cu blocks and 3% of the Cr particles according to the mass percentage, and the particle size of the Cr particles is 1 to 4mm; the Cu blocks are packed in a graphite crucible, and put into the induction furnace together, and the power of the induction furnace is adjusted to 240KW, The frequency is 1100Hz, and the temperature is rapidly raised to the melting point of Cu to melt the Cu block, then the weighed Cr particles are added, and then the slagging agent and the covering agent are added in sequence. The slagging agent is potassium fluozirconate, and the addition amount is 1% of the mass of Cu; the covering agent is charcoal, and the charcoal must completely cover the surface of the melt, and the covering thickness is 4mm. Continue to heat up the medium-frequency induction furnace until the melt temperature reaches 1300°C, and keep it warm for 5 minutes. After Cu and Cr are fully mixed, remove the slag on the surface of the melt, and open th...

Embodiment 2

[0033] Take by weighing 99% of the Cu blocks and 1% of the Cr particles according to the mass percentage, and the particle size of the Cr particles is 1 to 4mm; the Cu blocks are packed in a graphite crucible, and put into the induction furnace together, and the power of the induction furnace is adjusted to 230KW, The frequency is 1000Hz, and the temperature is rapidly raised to the melting point of Cu to melt the Cu block, and then the weighed Cr particles are added, and then the slagging agent and the covering agent are added in sequence. The slagging agent is potassium fluozirconate, and the addition amount is 2% of the mass of Cu; the covering agent is charcoal, and the charcoal must completely cover the surface of the melt, and the covering thickness is 6mm. Continue to heat up the medium-frequency induction furnace until the melt temperature reaches 1200 ° C, and keep it warm for 8 minutes. After Cu and Cr are fully mixed, remove the slag on the surface of the melt, open ...

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Abstract

The invention discloses a preparation method of CuCr alloy powder with low chromium content. The preparation method comprises the steps of: weighing copper block and chromium block according to mass percent, melting the copper block utilizing a medium-frequency induction smelting furnace, adding the chromium block to molten copper, then adding a certain amount of slag-forming agent and covering agent, and after copper and chromium are sufficiently mixed, atomizing with high-purity nitrogen as atomization gas, thus the melt is dispersed into small liquid drops and the liquid drops fall to an atomization barrel holding water for cooling and solidifying. The CuCr alloy powder prepared by the method is a supersaturated solid solution, has fine solidified structure, and can realize powder sintering easily; in the CuCr alloy powder, Cr phase component segregation is reduced and Cr is uniformly distributed on a substrate; and the problem that impurities are introduced during mechanical alloying is solved.

Description

technical field [0001] The invention belongs to the technical field of material preparation and relates to a method for preparing CuCr alloy powder with low chromium content. Background technique [0002] At present, people widely use the mechanical alloying method to prepare CuCr alloy materials with high strength and high conductivity. The mechanical alloying method is high-energy ball milling of copper powder and chromium powder. Cr forms a supersaturated solid solution, and then the formed CuCr alloy powder is consolidated and sintered. However, impurities are inevitably introduced during the ball milling process, and the presence of impurities will have adverse effects on the compaction and sintering of the powder. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing CuCr alloy powder with low chromium content, which solves the problem that impurities will be introduced in the current preparation method of CuCr ...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 肖鹏陆红伟梁淑华
Owner XIAN UNIV OF TECH
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