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A kind of method for preparing equiaxed crystal copper slab

An equiaxed crystal and copper casting technology, which is applied in the field of axial crystal copper billet, can solve the problem of copper melt polluted by refining agents, achieve the effects of improving mechanical properties and processing performance, reducing equipment costs, and solving pollution

Active Publication Date: 2018-07-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of the prior art, the purpose of the present invention is to provide a method for preparing a fully equiaxed crystal copper slab, which further reduces energy consumption, saves equipment costs, solves the problems of adding refining agents to pollute the copper melt, and is used for large-scale batch production. The production of fully equiaxed crystal cast copper blanks is applied to the preparation of high-purity precision copper materials

Method used

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  • A kind of method for preparing equiaxed crystal copper slab
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  • A kind of method for preparing equiaxed crystal copper slab

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preparation example Construction

[0024] In a specific embodiment, the present invention obtains a method for preparing a slab with a fully equiaxed crystal structure, using a copper rare earth alloy as a fully equiaxed crystal structure transformation agent, and the specific steps are as follows:

[0025] 1) The electrolytic copper plate is heated and melted, and the melt temperature is controlled within the range of 1120-1180°C;

[0026] 2) According to calculation according to the proportion of rare earth elements accounting for 0.35wt.% to 0.6wt.% of the copper melt, adding a copper rare earth isometric crystal structure transformation agent to the copper solution, stirring to make it uniformly mixed with the copper melt;

[0027] 3) After static refining, the alloy melt is poured into a metal mold with a preheating temperature of 350-400°C after standing for 10-30 minutes;

[0028] 4) Then the ingot is cooled to room temperature with the mould, and a copper billet with a complete equiaxed grain structure ...

Embodiment 1

[0033] Ingredients: prepare 1020g of electrolytic copper plate with a purity of 99.97wt%, accounting for 99.5wt.% of the total weight; prepare 35.2g of a copper-lanthanum fully equiaxed crystal structure transformation agent with a rare earth lanthanum content of 15wt.%, and the rare earth lanthanum accounts for 0.5% of the total weight wt.%; the total weight of the electrolytic copper plate and the copper lanthanum congruent equiaxed crystal structure transformation agent is 1055.2g.

[0034] Preparation process: Preheat the metal casting mold to 350°C in a heating furnace for use; put the prepared electrolytic copper plate into the melting furnace and heat and melt it, and control the melt temperature to 1150°C; add the prepared electrolytic copper plate to the copper solution Copper rare earth isometric crystal structure transformation agent, stirring to make it evenly mixed with copper melt, then standing for refining, standing for 15 minutes and then pouring the alloy melt...

Embodiment 2

[0037] The difference from Example 1 is that

[0038] Ingredients: configure 1020g of electrolytic copper plate with a purity of 99.97wt%, accounting for 99.55wt.% of the total weight; prepare 23.5g of a copper-cerium fully equiaxed crystal structure transformation agent with a rare earth cerium content of 20wt.%, and the rare earth cerium accounts for 0.45% of the total weight wt.%; The total weight of the electrolytic copper plate and the copper-cerium congruent equiaxed crystal structure transformation agent is 1043.5g.

[0039] Preparation process: Preheat the metal casting mold to 360°C in the heating furnace and wait for use; put the prepared electrolytic copper plate into the melting furnace and heat and melt it, and control the melt temperature to 1140°C; add the prepared electrolytic copper plate to the copper solution Copper rare earth isometric crystal structure transformation agent, stirring to make it evenly mixed with copper melt, and then standing for refining, ...

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Abstract

The invention belongs to the technical field of smelting and casting of copper alloy materials, in particular to a method for preparing a fully-equiaxially crystal copper casting blank. The method adopts a copper rare earth alloy as a fully-equiaxially crystal structural transformation agent, and comprises the following specific steps: an electrolytic copper plate is heated for melting, and the temperature of a melt is controlled in a range of 1120-1180 DEG C; according to a ratio of 0.35-0.6 wt.% of a rare earth element to a copper melt, a copper rare earth fully-equiaxially crystal structural transformation agent is added in copper solution for stirring to uniformly mix with the copper melt, and after standing refining and standing insulation by 10-30 minutes, an alloy melt is poured in a metal mold with a preheating temperature of 350-400 DEG C; and then, a casting ingot is cooled to the room temperature along with the mold to obtain the copper casting blank with a fully-equiaxially crystal structure. The method is applied to a precise copper casting blank preparation process, can prominently reduce the introduction of special impurity elements, obtains the congruent axis crystal structure, guarantees excellent heat and electricity conducting performance of precise copper, and improves the mechanical performance of the copper.

Description

technical field [0001] The invention belongs to the technical field of smelting and casting of copper alloy materials, and in particular relates to a method for preparing a fully equiaxed crystal copper billet. Background technique [0002] At present, copper and copper alloys are important pillar materials in the development of the national economy. However, there is a huge gap between my country and foreign developed countries in copper alloy casting and new product research and development capabilities, and various high-performance precision copper processing materials required for national economic development cannot be independently produced. In addition, solidification of castings is an important process for the preparation of pure metals and alloys. Solidification of castings usually produces two types of microstructure, namely columnar grains and equiaxed grains. Equiaxed grains generally form at the front of columnar grains and hinder the growth of columnar grains...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/20
Inventor 张士宏陈岩宋鸿武李海红程明刘劲松
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI