Cu-Cr alloy and ultrasonic-assisted smelting method thereof

An ultrasonic-assisted, cu-cr technology, applied in the field of Cu-Cr alloy, can solve the problems of unrealized modification of chromium crystals, and achieve the effect of reducing casting defects and improving mechanical properties

Pending Publication Date: 2021-06-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, successful modification of chromium crystals by ultrasound during solidification has not been achieved due to the lack of ultrasonic probes that can work stably at high temperatures near the liquidus line of copper alloys and do not react with copper melts.

Method used

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  • Cu-Cr alloy and ultrasonic-assisted smelting method thereof
  • Cu-Cr alloy and ultrasonic-assisted smelting method thereof
  • Cu-Cr alloy and ultrasonic-assisted smelting method thereof

Examples

Experimental program
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Embodiment 1

[0035] This embodiment discloses a Cu-Cr alloy ultrasonic assisted melting method, comprising the following steps:

[0036] Step 1: Preparation of copper-chromium master alloy raw materials. According to the mass fraction ratio: Cr: 20%, Cu: 80%, put 75g of high-purity copper particles and 15g of high-purity electrolytic chromium into the boron nitride crucible 1 And put it in a drying oven at 60°C for 1 hour, the purpose is to remove the residual moisture on the raw materials and the crucible;

[0037] The second step: prepare the master alloy: put the dried raw materials into the vacuum high-frequency induction furnace with the crucible (the copper particles are pressed on the chromium sheet), turn on the mechanical pump to vacuum to 130pa, turn on the molecular pump to vacuum to 10pa, Turn off the molecular pump and the mechanical pump in turn to stop vacuuming; open the protective gas valve to feed argon protective gas until the gauge pressure in the furnace is 0.5 atmosph...

Embodiment 2

[0049] This embodiment discloses a Cu-Cr alloy ultrasonic assisted melting method, comprising the following steps:

[0050] The first step: Copper-chromium master alloy raw material preparation: According to the mass fraction ratio: Cr: 20%, Cu: 80%, put 75g of high-purity copper particles and 15g of high-purity electrolytic chromium into the boron nitride crucible and mix Put it in a drying oven at 60°C for 1 hour to remove the residual moisture on the raw materials and the crucible;

[0051] The second step: prepare the master alloy: put the dried raw materials into the vacuum high-frequency induction furnace with the crucible (the copper particles are pressed on the chromium sheet), turn on the mechanical pump to vacuum to 130pa, turn on the molecular pump to vacuum to 10pa, Turn off the molecular pump and the mechanical pump in turn to stop vacuuming; open the protective gas valve to feed argon protective gas until the gauge pressure in the furnace is 0.5 atmospheres, and ...

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Abstract

The invention provides a Cu-Cr alloy and an ultrasonic-assisted smelting method thereof. The ultrasonic-assisted smelting method of the Cu-Cr alloy comprises the following steps: mixing copper particles with high-purity electrolytic chromium sheets, preparing a Cu-Cr intermediate alloy in a vacuum high-frequency induction furnace, mixing the obtained intermediate alloy with electrolytic copper blocks, and carrying out dilution in a medium-frequency induction furnace; and after the intermediate alloy is molten and is completely mixed with a melt, carrying out ultrasonic treatment on the metal melt for 0.5-5 min, and after the ultrasonic treatment is completed, pouring the alloy liquid into a water cooling mold to obtain a Cu-Cr alloy material. The whole process is carried out under non-vacuum standard atmospheric pressure. The smelting method is applied to a copper-based pseudo alloy for the first time, the quality of a cast ingot is improved, the microstructure of the as-cast alloy is improved, and the mechanical property of the alloy is improved.

Description

technical field [0001] The invention relates to Cu-Cr alloy technology, in particular to a Cu-Cr alloy and an auxiliary melting method thereof. Background technique [0002] Copper-chromium alloys are widely used in the manufacture of conductive components due to their unique combination of high electrical conductivity and mechanical strength. From the binary phase diagram of copper and chromium, it can be seen that chromium and copper do not form any composite phase, and chromium exists as a single phase in the alloy. Therefore, copper-chromium binary alloys are also considered pseudo-alloys in which tiny chromium particles are dispersed in the matrix. However, in the cast state, the resulting chromium is in the shape of a coarse herringbone. This increases the residual stress inside the alloy, which adversely affects the properties of the alloy. The introduction of ultrasonic waves into metal melts induces some important effects, such as transient cavitation and acousti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C9/00
CPCC22C1/03C22C9/00
Inventor 陈宗宁王同敏康慧君郭恩宇王志成李廷举曹志强卢一平接金川张宇博
Owner DALIAN UNIV OF TECH
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