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Cu-cr alloy containing trace pb element and solidification preparation method thereof

A cu-cr and alloy technology, applied in the field of Cu-Cr alloy preparation, can solve the problems of two-phase delamination, limitation of industrial preparation and application, phase segregation, etc.

Active Publication Date: 2020-03-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large difference in specific gravity between the two liquid phases, Cr-rich droplets will deposit, and at the same time, the temperature gradient in the melt during solidification will lead to a droplet / melt interfacial energy gradient, causing the droplets to migrate to the high-temperature region. Therefore, during the liquid-liquid phase transition of Cu-Cr alloy, it is easy to form serious phase segregation and even two-phase delamination, and its preparation is extremely difficult. It is difficult to obtain alloy materials with uniform structure by traditional casting methods, which limits the Cu-Cr Industrial Preparation and Application of Alloy

Method used

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  • Cu-cr alloy containing trace pb element and solidification preparation method thereof
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  • Cu-cr alloy containing trace pb element and solidification preparation method thereof

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Effect test

Embodiment 1

[0021] Such as figure 2 As shown, a Cu-15wt%Cr alloy is cast using a copper mold, the inner diameter of the copper mold is 5mm, and the temperature of the copper mold is room temperature before casting. The Cr-rich phase exists in the form of coarse dendrites in the sample without adding Pb, and the Cr-rich phase exists in the form of dispersed particles in the alloy sample added with 0.1wt% Pb, and the distribution is uniform.

[0022] Its preparation process is as follows:

[0023] The Cu-15wt%Cr alloy and the Cu-15wt%Cr-0.1wt%Pb alloy were smelted in an electric arc furnace, the temperature was raised to 1600°C and kept for 2 minutes, and then the melt was poured into a copper mold.

Embodiment 2

[0025] Such as image 3 As shown, a Cu-20wt%Cr alloy is casted with a copper mold, the inner diameter of the copper mold is 5mm, and the temperature of the copper mold is room temperature before casting. The Cr-rich phase exists in the form of coarse dendrites in the sample without adding Pb, and the Cr-rich phase exists in the form of dispersed particles in the alloy sample with 0.07wt% Pb added, and the distribution is uniform.

[0026] Its preparation process is as follows:

[0027] The Cu-20wt%Cr alloy and the Cu-20wt%Cr-0.07wt%Pb alloy were smelted in an electric arc furnace, the temperature was raised to 1600°C and kept for 2 minutes, and then the melt was poured into the copper mold.

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Abstract

The invention discloses a Cu-Cr alloy containing trace Pb elements and a solidification preparation method thereof, and belongs to the technical field of the Cu-Cr alloy preparation. The trace elements Pb are added into the Cu-Cr alloy, a nucleation rate of Cr-enriched rich phase liquid drops during a liquid-liquid phase change in a cooling process of Cu-Cr alloy melt is improved, and the formation of a diffuse-type Cu-Cr alloy compound solidification structure is promoted. The method can be used for preparing a Cu-Cr alloy material of a Cu-enriched matrix in which rich Cr particles are diffused and distributed.

Description

technical field [0001] The invention relates to the technical field of Cu-Cr alloy preparation, in particular to a Cu-Cr alloy containing a small amount of Pb element and a solidification preparation method thereof. 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. But the Cu-Cr alloy phase diagram is as follows figure 1 As shown, there is an immiscible temperature range of metastable liquid components. When the homogeneous alloy melt is cooled to the immiscible temperature range of metastable liquid components, a liquid-liquid phase transition will occur, and Cr-rich droplets will precipitate out of the melt. Due to the large difference in specific gravity between the two liquid phases, Cr-rich droplets will deposit, and at the same time, the temperature gradient in the melt during solidification will lead to a droplet / melt interfacial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/02
CPCC22C1/02C22C9/00
Inventor 赵九洲陶杰张丽丽江鸿翔
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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