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Manufacturing method for pre-alloying gold-tin pre-forming soldering lug

A solder preform and pre-alloying technology, which is applied in the field of welding, can solve the problems of easy oxidation of gold-tin alloys and difficult rolling of brittle alloys, and achieve the effects of reasonable production cost, not easy to oxidize, and high production efficiency

Inactive Publication Date: 2013-05-15
GUANGZHOU XIANYI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing pre-alloyed gold-tin solder preforms, which can effectively solve the problems that gold-tin alloys are easily oxidized during smelting and brittle alloys are difficult to roll and punch.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Raw material preparation

[0033] 100g of gold with a purity of 99.99% and 25g of tin with a purity of 99.99% are prepared;

[0034] (2) Pre-alloying

[0035] Put the raw material obtained in the above step (1) into a crucible in an atmosphere-protected vacuum glove box, and heat it to 350°C for melting under a N2+H2 protective atmosphere (the volume percentage of H2 in the mixed gas is 10%, and the air pressure is one atmosphere) A uniform liquid gold-tin alloy is pre-alloyed, and cast into an ingot mold to form a plate-type alloy ingot with a size (length x width x thickness) of 115x15x5mm; the entire process should be completed in an atmosphere-protected vacuum glove box to ensure Alloy ingots are not oxidized.

[0036] (3) hot rolling

[0037] Heat the plate-shaped pre-alloyed gold-tin alloy ingot prepared in the above step (2) to 220°C, use a precision hot rolling mill to roll the gold-tin alloy ingot, keep the ingot at 220°C, and press continuously to the t...

Embodiment 2

[0043] (1) Raw material preparation

[0044] 200g purity is 99.99% gold, 50g purity is the raw material of 99.99% tin;

[0045] (2) Pre-alloying

[0046] Put the raw material obtained in step (1) into a crucible in an atmosphere-protected vacuum glove box, and heat it to 420°C for melting under a N2+H2 protective atmosphere (the volume percentage of H2 in the mixed gas is 5%, and the air pressure is one atmosphere) A uniform liquid gold-tin alloy is pre-alloyed, and cast into an ingot mold to form a plate-shaped alloy ingot with a size (length x width x thickness) of 140x25x5mm; the entire process should be completed in an atmosphere-protected vacuum glove box to ensure Alloy ingots are not oxidized.

[0047] (3) hot rolled

[0048] Heat the plate-shaped pre-alloyed gold-tin alloy ingot obtained in step (2) to 200°C, use a precision hot rolling mill to roll the gold-tin alloy ingot, keep the ingot at 200°C, and press continuously to a thickness of 0.15 mm thin strip.

[0...

Embodiment 3

[0054] (1) Raw material preparation

[0055] 300g purity is 99.99% gold, 75g purity is the raw material of 99.99% tin;

[0056] (2) Pre-alloying

[0057] Put the raw material obtained in step (1) into a crucible in an atmosphere-protected vacuum glove box, and heat it to 500°C under a N2+H2 protective atmosphere (the volume percentage of H2 in the mixed gas is 7%, and the air pressure is one atmosphere) and melted to form The uniform liquid gold-tin alloy is pre-alloyed and cast into the ingot mold to form a plate-shaped alloy ingot with a size of (length x width x thickness) 175x30x5mm; the whole process should be completed in an atmosphere-protected vacuum glove box to ensure that the alloy The ingot was not oxidized.

[0058] (3) hot rolling

[0059] Heat the plate-shaped pre-alloyed gold-tin alloy ingot obtained in step (2) to 180°C, use a precision hot rolling mill to roll the gold-tin alloy ingot, keep the ingot at 180°C, and press continuously to a thickness of 0.4 ...

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Abstract

The invention provides a manufacturing method for a pre-alloying gold-tin pre-forming soldering lug. The process of the method mainly comprises five steps such as raw material preparation, pre-alloying, hot rolling, annealing and blanking forming. Due to the fact that N2+H2 mixed protective gas is injected into a vacuum melting protective system to conduct the pre-alloying, gold-tin alloy is not prone to be oxidized in melting process. Due to adoption of the hot rolling and annealing blanking of gold-tin materials after the pre-alloying, a machined gold-tin soldering lug is accurate in composition, complete and precise in shape and excellent in soldering using performance. Meanwhile, the manufacturing method for the pre-alloying gold-tin pre-forming soldering lug has the advantages of being simple in technology and process, reasonable in production cost and high in production efficiency.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a preparation method of a pre-alloyed gold-tin preform. Background technique [0002] Due to the moderate melting point (280°C) of gold 80% tin 20% eutectic alloy, high strength, good thermal and electrical conductivity, excellent wettability, low viscosity, easy welding, corrosion resistance, creep resistance, no need for flux, etc. , Therefore, it has a wide range of applications in ceramic packaging capping of microelectronic devices and optoelectronic devices, chip bonding, ceramic insulator welding of metal packaging, and chip welding of high-power semiconductor lasers. [0003] The disadvantages of gold-tin solder are: it is easy to be oxidized during smelting and pre-alloying, its performance is brittle, and its elongation is very small. It is difficult to produce thin strips and deep-processed products that meet the requirements of microelectronic devices with convention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 陈卫民
Owner GUANGZHOU XIANYI ELECTRONICS TECH
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