A kind of solidification preparation method of cu-cr electric contact alloy

An electrical contact, cu-cr technology, applied in the direction of contacts, circuits, electrical switches, etc., can solve the problems of alloy difficulty, phase segregation, two-phase delamination, etc., and achieve the effect of improving the nucleation rate

Active Publication Date: 2020-03-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in specific gravity between the two liquid phases, severe phase segregation and even two-phase delamination are easily formed during the liquid-liquid phase transition. Therefore, it is extremely difficult to prepare a Cu-Cr electrical contact alloy with a dispersed solidification structure. It is difficult to obtain alloy materials with uniform structure by traditional casting methods, which limits the industrial use of casting technology to prepare Cu-Cr electrical contact alloys

Method used

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  • A kind of solidification preparation method of cu-cr electric contact alloy
  • A kind of solidification preparation method of cu-cr electric contact alloy
  • A kind of solidification preparation method of cu-cr electric contact alloy

Examples

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Effect test

Embodiment 1

[0024] Such as image 3 Cu-10wt%Cr alloy and Cu-10wt%Cr-0.05wt%TiB were cast using copper molds as shown 2 alloy, the inner diameter of the copper mold is 5mm, and the temperature of the copper mold is room temperature before pouring. No TiB added 2 The Cr-rich phase exists in the form of coarse dendrites in the particle sample, and the addition of TiB 2 The Cr-rich phase exists in the form of fine particles in the alloy sample of particles, and the distribution is uniform.

[0025] Its preparation process is as follows:

[0026] Melting Cu-10wt%Cr Alloy and Cu-10wt%Cr-0.05wt%TiB by Electric Arc Furnace 2 Alloy, heat up to 1600°C and keep it warm for 2 minutes, then pour the melt into the copper mold.

Embodiment 2

[0028] Such as Figure 4 Cu-20wt%Cr alloy and Cu-20wt%Cr-0.05wt%TiB were cast using copper molds as shown 2 alloy, the inner diameter of the copper mold is 5mm, and the temperature of the copper mold is room temperature before pouring. No TiB added 2 The Cr-rich phase exists in the form of coarse dendrites in the particle sample, and the addition of TiB 2 The Cr-rich phase exists in the form of dispersed particles in the alloy sample of particles, and the distribution is uniform.

[0029] Its preparation process is as follows:

[0030] Melting Cu-20wt%Cr Alloy and Cu-20wt%Cr-0.05wt%TiB by Electric Arc Furnace 2 Alloy, heat up to 1600°C and keep it warm for 2 minutes, then pour the melt into the copper mold.

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Abstract

The invention discloses a solidification preparation method of a Cu-Cr contact alloy, and belongs to the technical field of preparation of Cu-Cr contact alloy materials. TiB2 nucleating agent particles are added into the Cu-Cr alloy, when a fusant is cooled till liquid-liquid phase change occurs, the nucleating agent particles can serve as the nucleating substrate of Cr-rich phase liquid drops, thus the nucleating rate of the Cr-rich phase liquid drops is dramatically improved, and formation of a dispersion type Cu-Cr alloy composite solidification structure can be promoted. The solidificationpreparation method can be used for preparing high-quality Cu-Cr contact alloy materials.

Description

technical field [0001] The invention relates to the technical field of preparation of Cu-Cr electric contact alloy material, in particular to a solidification preparation method of Cu-Cr electric contact alloy. Background technique [0002] Cu-Cr alloy is an important electrical contact material. The material requires that the Cr-rich phase is dispersed in the Cu matrix in the form of particles. The phase diagram of Cu-Cr alloy is as follows figure 1 As shown, there is an immiscible temperature range of liquid metastable components (see figure 1 dotted line). When the homogeneous alloy melt is cooled to the immiscible temperature range of liquid metastable components, a liquid-liquid phase transition will occur, and Cr-rich phase droplets will precipitate out of the melt. Due to the large difference in specific gravity between the two liquid phases, severe phase segregation and even two-phase delamination are easily formed during the liquid-liquid phase transition. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/10C22C1/02H01H1/025
CPCC22C1/1036C22C9/00C22C32/0073H01H1/025
Inventor 赵九洲陶杰江鸿翔张丽丽
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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