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A kind of preparation method of gold-silver-copper alloy ingot

A technology for copper alloy and ingot casting is applied in the field of preparation of gold-silver-copper alloy ingots, which can solve the problems affecting product reliability, hardness deviation, product hardness, electrical conductivity and wear resistance and other performance deviations, and achieves elimination of short-range problems. order, high yield, and the effect of reducing the tendency of internal porosity

Active Publication Date: 2020-05-26
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Products produced with this ingot are prone to hardness deviations, resulting in deviations in product hardness, electrical conductivity, wear resistance, etc., which seriously affect product reliability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment prepares AuAgCu35-5 alloy ingot, and the preparation method includes:

[0024] Step 1. Use a high-purity alumina crucible and a heat-resistant steel mold with a wall thickness of 30mm, use water glass and alumina sand with a mass ratio of 3:7 to coat the mold, and bake the high-purity alumina crucible at 1000°C 4h, bake the steel bottom pad, alumina riser and the coated mold at 700°C for 30min, then place the baked steel bottom pad on the mold base in the vacuum medium frequency induction melting furnace, and bake The baked mold is placed on the steel bottom pad, the baked alumina riser is placed on the mold, and the baked high-purity alumina crucible is placed in a vacuum intermediate frequency induction melting furnace; the quality purity is not less than 99.99 % Au and Ag with a mass purity of not less than 99.99% are formulated according to the nominal composition of AuAg40 and placed in a baked high-purity alumina crucible. Start heating and meltin...

Embodiment 2

[0029] This embodiment prepares AuAgCu20-10 alloy ingot, and the preparation method includes:

[0030] Step 1. Use a high-purity alumina crucible and a heat-resistant steel mold with a wall thickness of 20mm, use water glass and alumina sand with a mass ratio of 2:8 to coat the mold, and bake the high-purity alumina crucible at 900°C 5h, bake the steel bottom pad, alumina riser and the mold after coating at 650°C for 60min, then put the baked steel bottom pad on the mold base in the vacuum medium frequency induction melting furnace, and put the baked The baked mold is placed on the steel bottom pad, the baked alumina riser is placed on the mold, and the baked high-purity alumina crucible is placed in a vacuum intermediate frequency induction melting furnace; the quality purity is not less than 99.99 % Au and Ag with a mass purity of not less than 99.99% are formulated according to the nominal composition of AuAg40 and placed in a baked high-purity alumina crucible. Start heat...

Embodiment 3

[0035] This embodiment prepares AuAgCu20-20 alloy ingot, and the preparation method includes:

[0036] Step 1: Use a high-purity alumina crucible and a heat-resistant steel mold with a wall thickness of 40mm, use water glass and alumina sand with a mass ratio of 2.5:7.5 to coat the mold, and bake the high-purity alumina crucible at 950°C 4.5h, bake the steel bottom pad, alumina riser and the coated mold at 680°C for 40min, then place the baked steel bottom pad on the mold base in the vacuum medium frequency induction melting furnace, and place the Put the baked mold on the steel bottom pad, put the baked alumina riser on the mold, and place the baked high-purity alumina crucible in a vacuum intermediate frequency induction melting furnace; the quality purity is not less than 99.99% Au and Ag with a mass purity of not less than 99.99% are distributed according to the nominal composition of AuAg40 and placed in a baked high-purity alumina crucible. Start heating and smelting wh...

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Abstract

The invention relates to a preparing method for an AuAgCu alloy cast ingot. The preparing method comprises the following steps that firstly, AuAg intermediate alloy cast ingot preparing is conducted;secondly, the surface defects of an AuAg intermediate alloy cast ingot are removed, a strip is prepared through rolling, after the strip is shorn into sheets, thorough cleaning and airing are conducted, and AuAg intermediate alloy sheets are obtained; thirdly, Au and oxygen-free Cu are arranged in an aluminum oxide crucible of a vacuum medium-frequency induction smelting furnace, the AuAg intermediate alloy sheets are placed in a charging hopper of the vacuum medium-frequency induction smelting furnace, smelting and casting forming is conducted, and the AuAgCu alloy cast ingot is obtained. Bymeans of the preparing method, the quality of the AuAgCu alloy cast ingot is obviously improved, and the problem about segregation of the rich Cu phase and the rich Ag phase due to component segregation of structures of the AuAgCu alloy cast ingot is solved; and the defects of internal shrinkage, air holes, inclusions and the like of the cast ingot are reduced, and AuAgCu plates and strips excellent in quality and high in yield can be better machined in the later period.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and in particular relates to a method for preparing a gold-silver-copper alloy ingot. Background technique [0002] AuAgCu alloy has excellent chemical stability and electrical corrosion resistance, and is widely used in electrical contact components in aerospace control systems and micro-motors, such as potentiometer windings, conductive rings, brushes, contact points, commutators, etc. Aerospace vehicles fly in the atmosphere and space, and the working environment is complex and changeable. AuAgCu alloy has good corrosion resistance to humid atmosphere, smog, kerosene, gasoline mist, rocket fuel gas and various sulfurized and organic industrial waste gases. Using AuAgCu alloy as electrical contact element has the requirement of high life and high reliability. Effectively guarantee the reliability and accuracy of the aerospace vehicle control system. The Au content of the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/00C22C1/03
CPCB22C3/00B22D7/005C22C1/03C22C5/02C22C30/00
Inventor 赵涛丁峰峰王航史智峰范晔周晓周龙海孟志军马小龙李永娣张小英陈昊韩吉庆
Owner 西安诺博尔稀贵金属材料股份有限公司
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