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Method for preparing CuCr-MgBi contact material through electromagnetic-ultrasonic suspension smelting

A technology of suspending smelting and contact materials, applied in contact materials, contacts, circuits, etc., to achieve the effects of strong breaking capacity, reduced segregation, and increased crystal defect density

Active Publication Date: 2020-09-04
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has rarely been reported on the application of CuCr contacts.

Method used

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  • Method for preparing CuCr-MgBi contact material through electromagnetic-ultrasonic suspension smelting
  • Method for preparing CuCr-MgBi contact material through electromagnetic-ultrasonic suspension smelting
  • Method for preparing CuCr-MgBi contact material through electromagnetic-ultrasonic suspension smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Ingredients: Weigh Cr ingots, Cu ingots, CuMg alloy ingots, and Bi ingots as alloy samples, in which the Cr content is 25%, the Mg content is 0.05%, and the Bi content is 0.005%.

[0046] 2. Furnace loading: Put the Cr block, Cu block, and CuMg alloy block on the hollow ceramic support rod of the closed container system, and put the Bi block into the secondary feeding device.

[0047] 3. Ultrasonic levitation: vacuumize the airtight container system to 10 -1 Pa; Turn on the ultrasonic standing wave generator to make the sample suspended stably.

[0048] 4. Induction heating: Turn on the high-frequency induction heater, and heat according to the temperature gradient of 10KW, 20KW, 30KW, 40KW and the stirring frequency of 150KHz.

[0049] (1) The 10KW stage is maintained for 1min, and the distance between the radiation end and the reflection end is adjusted to increase the suspension force compensation.

[0050] (2) The 20KW and 30KW phases are maintained for 1 minut...

Embodiment 2

[0059] 1. Ingredients: Weigh Cr ingots, Cu ingots, CuMg alloy ingots, and Bi ingots as alloy samples, in which the Cr content is 30%, the Mg content is 0.25%, and the Bi content is 0.05%.

[0060] 2. Furnace loading: Put the Cr block, Cu block, and CuMg alloy block on the hollow ceramic support rod of the closed container system, and put the Bi block into the secondary feeding device.

[0061] 3. Ultrasonic levitation: vacuumize the airtight container system to 10 -1 Pa; Turn on the ultrasonic standing wave generator to make the sample suspended stably.

[0062] 4. Induction heating: Turn on the high-frequency induction heater, and heat according to the temperature gradient of 10KW, 20KW, 30KW, 40KW and the stirring frequency of 150KHz.

[0063] (1) The 10KW stage is maintained for 2 minutes, and the distance between the radiation end and the reflection end is adjusted to increase the suspension force compensation.

[0064] (2) The 20KW and 30KW phases are maintained for 2 m...

Embodiment 3

[0073] 1. Ingredients: Weigh Cr lumps, Cu lumps, CuMg alloy lumps, and Bi lumps as alloy samples, in which the Cr content is 30%, the Mg content is 0.25%, and the Bi content is 0.05%.

[0074] 2. Furnace loading: Put the Cr block, Cu block, and CuMg alloy block on the hollow ceramic support rod of the closed container system, and put the Bi block into the secondary feeding device.

[0075] 3. Ultrasonic levitation: vacuumize the airtight container system to 10 -1 Pa; Turn on the ultrasonic standing wave generator to make the sample suspended stably.

[0076] 4. Induction heating: Turn on the high-frequency induction heater, and heat according to the temperature gradient of 10KW, 20KW, 30KW, 40KW and the stirring frequency of 150KHz.

[0077] (1) The 10KW stage is maintained for 3 minutes, and the distance between the radiation end and the reflection end is adjusted to increase the suspension force compensation.

[0078] (2) The 20KW and 30KW phases are maintained for 3 minut...

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Abstract

The invention relates to the technical field of alloy contacts, in particular to a method for preparing a CuCr-MgBi contact material through electromagnetic-ultrasonic suspension smelting. The methodspecially comprises the steps of burdening, furnace charging, ultrasonic suspension, suspension heating, suspension solidifying, hot forging deforming and mechanical machining. According to the process, micro Mg and Bi are added into a traditional CuCr alloy, a CuCr contact has the lower chopping current and tensile strength, the breaking capacity is higher, meanwhile, due to adding of the Mg, deoxygenation can be effectively achieved, the contact with the low oxygen content can be obtained. The electromagnetic-ultrasonic suspension smelting technology is adopted, limit of a crucible materialis broken through, the solution pollution-free industrial needs can be achieved, a rapid solidifying method is used, the solid solution degree of Cr in Cu can be greatly improved, segregation is reduced, the crystal defect density is increased, a new metastable phase is formed, and finished crystalline grains are refined.

Description

technical field [0001] The invention relates to the technical field of alloy contact preparation, in particular to a method for preparing CuCr-MgBi contact material by electromagnetic-ultrasonic suspension melting. Background technique [0002] CuCr contacts are currently recognized as the best material for vacuum circuit breakers. During service, they are responsible for closing, carrying and breaking current under normal circuit conditions, and can be closed, carried and opened within a specified time. However, in the actual application process, there will still be situations such as breaking failure due to too high cut-off value, or failure of contact welding to disconnect, so arc extinguishing chamber manufacturers have been pursuing low cut-off current value, high resistance to fusion welding, low gas content and other indicators, put forward higher requirements for contact materials, low cut-off value means that it is necessary to choose materials with higher vapor pre...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C9/00C22F1/08H01H1/02H01H11/04H01H33/664
CPCC22C1/03C22C9/00C22F1/08H01H1/0206H01H11/04H01H33/664
Inventor 张石松王小军刘凯李鹏杨斌师晓云贺德永赵俊王文斌李刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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