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Preparation method of gold-tin eutectic alloy material

A technology of eutectic alloy and gold material, which is applied in the field of preparation of gold-tin eutectic alloy materials, can solve the problems of gold-tin alloy materials being brittle and difficult to process, and the preparation process is not environmentally friendly, so as to solve the oxidation and volatilization of tin, reduce oxidation and volatilization , thickness controllable effect

Pending Publication Date: 2020-07-03
紫金矿业集团黄金冶炼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a gold-tin eutectic alloy material with simple and efficient operation, uniform composition of the gold-tin eutectic alloy, good processing performance, production safety and environmental protection, and solve the problem of Sn volatilization, Gold-tin alloy materials are brittle and difficult to process, and the preparation process is not environmentally friendly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method operating steps of a kind of gold-tin eutectic alloy material of the present invention are as follows:

[0023] 1. Preparation and distribution of materials

[0024] Weigh 800g of Au with a purity of 99.999% and 200g of Sn with a purity of 99.999% with an electronic balance, and divide the tin particles into three parts, and place them in 1#, 2#, and 3# graphite molds respectively.

[0025] 2. Smelting gold material

[0026] Step 1: Put 800g of gold material in a quartz crucible, then put the quartz crucible in an intermediate frequency melting furnace and turn on the power to melt into a pure gold solution at a melting temperature of 1150°C; put 1#, 2#, 3#, 4# graphite molds Preheat, pour the pure gold solution into the 1# graphite mold, ensure that the pure gold solution completely covers the pure tin particles at the bottom of the 1# graphite mold, prevent tin oxidation and volatilization, and realize pre-alloying;

[0027] Step 2: Put the pr...

Embodiment 2

[0034] The thickness of the gold-tin eutectic alloy slab is 2 mm, the melting temperature in step 4 is 500° C., and other operating steps and process parameters are the same as those in Example 1. A gold-tin eutectic alloy foil with a thickness of 15 μm is obtained. The composition detection results are as follows:

[0035] sample name Au(%) Sn(%) Alloy middle 88.015 11.976 alloy tail 87.995 11.997

Embodiment 3

[0037] The thickness of the gold-tin eutectic alloy slab is 4mm, and the melting temperature in step 4 is 400°C. Other operating steps and process parameters are the same as those in Example 1, and a gold-tin eutectic alloy foil with a thickness of 15 μm is obtained. The composition detection results are as follows:

[0038] sample name Au(%) Sn(%) Alloy middle 88.007 11.984 alloy tail 88.015 11.978

[0039] It can be seen from the above three examples that the prepared gold-tin eutectic alloy has good compositional uniformity.

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PUM

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Abstract

The invention discloses a preparation method of a gold-tin eutectic alloy material. The preparation method comprises the following operation steps that (1) a pure gold material and pure tin particlesare prepared according to a mass ratio of 8 to 2, and then the tin particles are equally divided into 3 parts; (2) the gold material are put into a quartz crucible and are put into a medium-frequencyinduction furnace to be melted into a pure gold solution, the 3 parts of pure tin particles are put into 1 #-3 # graphite molds, and 1 #-4 # graphite molds are preheated; then the gold solution is poured into a 1 # mold and covers the pure tin particles to prevent tin from being oxidized and volatilized, and pre-alloying is achieved; the pre-alloy is put into the quartz crucible to be melted and then poured into a 2 # mold; then the pre-alloy of the 2 # mold is put into the quartz crucible to be melted and then poured into a 3 # mold; finally, the pre-alloy of the 3 # mold is put into the quartz crucible to be melted and then poured into a 4 # mold to be prepared into a gold-tin eutectic alloy flat billet with uniform components and the thickness of 1mm-4 mm; and (3), the flat billet is subjected to constant-temperature multi-pass hot rolling, the pass deformation is 5%-20%, and the gold-tin eutectic alloy foil with the thickness of 15 microns-30 microns is obtained. The method is easyand efficient to operate, the gold-tin eutectic alloy is uniform in component, good in machinability, safe and environmentally friendly.

Description

technical field [0001] The invention relates to a preparation method of a precious metal alloy material, in particular to a preparation method of a gold-tin eutectic alloy material. Background technique [0002] With the continuous development of electronic packaging technology, various soldering materials for packaging are getting more and more attention. AuSn15~20% has good melting fluidity, good chemical stability, high electrical conductivity, high thermal conductivity, good creep resistance, excellent fatigue resistance, good oxidation resistance, good corrosion resistance, no need for flux and welding It is an excellent soldering material and is usually used in the field of optoelectronic packaging. The preparation methods of the following gold-tin alloys were found from the website of the State Intellectual Property Office: [0003] CN106834782 discloses a method for manufacturing gold-tin alloy wire rods. The method first mixes gold and tin ingots with a certain ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C5/02B21B1/40B21B37/74
CPCB21B1/40B21B37/74C22C1/02C22C5/02
Inventor 林烽先钟茂礼应宗波周方李良罗鹏荷
Owner 紫金矿业集团黄金冶炼有限公司