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A kind of preparation method of copper-gadolinium master alloy

A technology for master alloy and copper-gadolinium, which is applied in the field of preparation of copper-gadolinium master alloy, can solve the problems of complex loss of raw materials in preparation of copper-gadolinium binary master alloy, high chemical activity and limited gadolinium element, etc., so as to improve smelting efficiency and composition. The effect of small deviation from the design composition and uniform chemical composition

Active Publication Date: 2019-02-05
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical activity of gadolinium is high, it is easy to react with media such as water and air when heated, and the burning loss is serious during high-temperature smelting. It is very complicated to prepare a copper-gadolinium binary master alloy with low raw material loss and uniform composition.
At present, the research on copper-gadolinium binary master alloy is very limited, and the master alloy melting and casting technology needs to be further improved

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  • A kind of preparation method of copper-gadolinium master alloy

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preparation example Construction

[0019] The preparation method of copper-gadolinium master alloy of the present invention adopts the vacuum smelting mode, comprises the steps:

[0020] (1) Material selection, batching, and furnace loading: A-grade cathode electrolytic copper with a purity of not less than 99.9965% (mass percentage) and gadolinium with a purity of not less than 99.0% (mass percentage) are selected as raw materials, and the proportion of gadolinium element is 3%~ 9% (mass percentage), and the balance is copper to prepare a master alloy and weigh gadolinium and electrolytic copper. When weighing gadolinium raw materials, 3-6% (mass percentage) should be added on the basis of the design weight. When loading materials, lay 2-5 layers of electrolytic copper plates cut into small pieces on the bottom of the graphite crucible, lay evenly the gadolinium raw materials with an average particle size of less than 15 mm on the electrolytic copper layer, and then cover it with 1 to 2 layers of electrolytic c...

Embodiment 1

[0024] A preparation method of a copper-gadolinium master alloy adopts a vacuum melting method, comprising the steps of:

[0025] (1) The mass ratio of the master alloy is designed to be Cu:Gd=97:3. Select 97kg of electrolytic copper plates with a purity greater than 99.9965wt.%, cut into small pieces of about (120mm±20mm)×(70mm±10mm); select 3.15kg of gadolinium with a purity greater than 99.0wt.%, and crush them into small pieces with an average particle size of 12mm as raw material. Lay 5 layers of electrolytic copper plates on the bottom of a 200kg graphite crucible, evenly lay gadolinium particles on the electrolytic copper layer, and then cover it with 2 layers of electrolytic copper plates, and lay repeatedly until all raw materials are filled.

[0026] (2) Vacuumize to a pressure of 8.0×10 -2 At Pa, start to heat up with medium power, until the electrolytic copper starts to melt and a small amount of molten metal splashes, fill it with argon to 30Pa, increase the pow...

Embodiment 2

[0030] A preparation method of a copper-gadolinium master alloy adopts a vacuum melting method, comprising the steps of:

[0031] (1) The mass ratio of the master alloy is designed to be Cu:Gd=96:4. Select 96kg of electrolytic copper plates with a purity greater than 99.9965wt.%, cut into small pieces of about (120mm±20mm)×(70mm±10mm); select 4.24kg of gadolinium with a purity greater than 99.0wt.%, and crush them into small pieces with an average particle size of 12mm as raw material. Lay 5 layers of electrolytic copper plates on the bottom of a 200kg graphite crucible, evenly lay gadolinium particles on the electrolytic copper layer, and then cover it with 2 layers of electrolytic copper plates, and lay repeatedly until all raw materials are filled.

[0032] (2) Vacuumize to a pressure of 9.0×10 -2 At Pa, start to heat up with medium power, until the electrolytic copper starts to melt and a small amount of molten metal splashes, fill it with argon to 30Pa, increase the pow...

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Abstract

The invention relates to a preparation method for a copper gadolinium intermediate alloy and belongs to the technical field of copper alloy material smelting and casting. According to the preparation method, a vacuum smelting mode is adopted, sorting is conducted according to the mass ratio of the copper gadolinium intermediate alloy, and then burdening and charging are conducted; vacuumizing, temperature rising and argon filling are conducted, and after metal is completely melted, stirring, heat-preservation refining and degasification are conducted; and uniform pouring is conducted, and the copper gadolinium intermediate alloy with the gadolinium content being 3-9% (by mass) is prepared. According to the preparation method, smelting efficiency is improved by adoption of a special loading method, by controlling the temperatures of all stages in the smelting technique, the melt masses in the melting, reacting and refining processes are adjusted; and water-cooled mould pouring is adopted for reducing segregation, a copper gadolinium intermediate alloy cast ingot prepared through the method is uniform in component, small in deviation, low in impurity content, low in melting point, free of obvious defects in the inside, and the preparation method for the copper gadolinium intermediate alloy is very applicable to gadolinium modified copper alloy preparation.

Description

technical field [0001] The invention relates to a method for preparing a copper-gadolinium master alloy, which belongs to the technical field of copper alloy melting and casting. Background technique [0002] Rare earth elements in copper mainly play the role of purifying, removing impurities and refining grains. While significantly improving the strength and heat resistance of materials, they have little effect on electrical conductivity, and can also significantly improve the casting properties of alloys. Taking advantage of the characteristics and advantages of rare earths in my country, the research and development of rare earth modified copper and copper alloys with excellent comprehensive properties is of great significance for the development of efficient utilization and high-end applications of rare earths, and the support and development of my country's copper processing industry. [0003] Research has known that adding a very small amount of rare earth elements can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/02C22C1/03
CPCC22C1/02C22C1/03C22C9/00
Inventor 解浩峰彭丽军黄国杰米绪军李艳锋尹向前冯雪杨振
Owner GRIMAT ENG INST CO LTD