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Gold-tin solder protective smelting method

A solder and resistance furnace technology, which is applied in metal processing equipment, welding/cutting media/materials, welding media, etc., can solve problems such as high cost, inability to achieve precise temperature control, and high saturated vapor pressure of tin

Active Publication Date: 2012-10-03
GUANGZHOU XIANYI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the vacuum melting furnace is that although it can provide a melting environment of vacuum and protective atmosphere, most of this type of equipment is a high-frequency induction melting machine, which can only adjust its heating power, cannot achieve precise temperature control, and is expensive. In addition, the mechanical stirring device configured on the vacuum melting equipment cannot flexibly deal with the problem of stirring the molten pool when the solder is in a solid state. In addition, the saturated vapor pressure of tin is high and it is easy to volatilize in a vacuum environment. Therefore, industrial vacuum melting furnaces do not Not suitable for protective melting of gold-tin solder

Method used

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  • Gold-tin solder protective smelting method

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Effect test

Embodiment 1

[0021] Such as figure 1 Shown, a kind of gold-tin solder protection smelting method comprises the steps:

[0022] (1) The resistance furnace 2, the crucible 9, the casting mold 3 and the quartz rod 7 are arranged in the vacuum glove box 8, wherein the furnace temperature control cabinet 1 of the resistance furnace 2 is placed outside the vacuum glove box 8, and the resistance furnace 2. The crucible 9, the casting mold 3, the quartz rod 7 and the vacuum glove box 8 constitute a protective melting system.

[0023] (2) Put the pre-prepared gold-tin material (the weight ratio of gold to tin is 80:20) into the vacuum glove box 8 configured to protect the smelting system.

[0024] (3) Start the vacuum pump 4 to evacuate until the pressure is -0.1MPa or below -0.1MPa, and then stop the vacuum pump 4.

[0025] (4) Charge N 2 + H 2 The gas mixture (H 2 The proportion in the mixed gas is 10%) to one atmosphere, where N 2 Installed in nitrogen tank 5, H 2 Installed in the hydrog...

Embodiment 2

[0030] Such as figure 1 Shown, a kind of gold-tin solder protection smelting method comprises the steps:

[0031] (1) The resistance furnace 2, the crucible 9, the casting mold 3 and the quartz rod 7 are arranged in the vacuum glove box 8, wherein the furnace temperature control cabinet 1 of the resistance furnace 2 is placed outside the vacuum glove box 8, and the resistance furnace 2. The crucible 9, the casting mold 3, the quartz rod 7 and the vacuum glove box 8 constitute a protective melting system.

[0032] (2) Put the pre-prepared gold-tin material (the weight ratio of gold to tin is 80:20) into the vacuum glove box 8 configured to protect the smelting system.

[0033] (3) Start the vacuum pump 4 to evacuate until the pressure is -0.1MPa or below -0.1MPa, and then stop the vacuum pump 4.

[0034] (4) Charge N 2 + H 2 The gas mixture (H 2 The proportion in the mixture is 5%) to one atmosphere, where N 2 Installed in nitrogen tank 5, H 2 Installed in the hydrogen ...

Embodiment 3

[0039] Such as figure 1 Shown, a kind of gold-tin solder protection smelting method comprises the steps:

[0040] (1) The resistance furnace 2, the crucible 9, the casting mold 3 and the quartz rod 7 are arranged in the vacuum glove box 8, wherein the furnace temperature control cabinet 1 of the resistance furnace 2 is placed outside the vacuum glove box 8, and the resistance furnace 2. The crucible 9, the casting mold 3, the quartz rod 7 and the vacuum glove box 8 constitute a protective melting system.

[0041] (2) Put the pre-prepared gold-tin material (the weight ratio of gold to tin is 80:20) into the vacuum glove box 8 configured to protect the smelting system.

[0042] (3) Start the vacuum pump 4 to evacuate until the pressure is -0.1MPa or below -0.1MPa, and then stop the vacuum pump 4.

[0043] (4) Charge N 2 + H 2 The gas mixture (H 2 The proportion in the mixed gas is 7%) to one atmosphere, where N 2 Installed in nitrogen tank 5, H 2 Installed in the hydroge...

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Abstract

The invention provides a gold-tin solder protective smelting method which comprises the following steps: (1) arranging a resistance furnace, a crucible, a casting mold and a quartz rod in a vacuum glove box, wherein a furnace temperature control cabinet of the resistance furnace is arranged outside the vacuum glove box, and the resistance furnace, crucible, casting mold, quartz rod and vacuum glove box constitute a protective smelting system; (2) putting a prepared gold-tin solder into the prepared protective smelting system; (3) starting a vacuum pump to vacuumize until the pressure reaches -0.1MPa or below, and shutting down the vacuum pump; (4) charging N2+H2 mixture to atmospheric pressure; (5) starting the resistance furnace, and setting the smelting temperature by using the furnace temperature control cabinet; (6) sequentially adding the tin solder and gold solder into the crucible, and stirring with the quartz rod at proper time; and (7) after finishing smelting, manually casting the liquid alloy into the casting mold.

Description

technical field [0001] The invention relates to a gold-tin solder protection smelting method for preventing oxidation of a molten alloy during gold-tin solder smelting. Background technique [0002] The smelting of gold-tin solder is a crucial part in the production of gold-tin preforms. The quality of gold-tin solder smelting directly affects the subsequent production and processing of gold-tin solder preforms and product quality. Among the gold-tin solders, tin is a very active metal, which is easily oxidized in the molten state and produces tin slag in the molten pool. If the tin is allowed to oxidize without protection during smelting, the composition of the gold-tin alloy will deviate from the expected value, and the tin slag generated will also affect the quality of the cast ingot. The melting point of gold-tin (Au80Sn20) eutectic solder is 280°C. During smelting, pure tin material and gold material configured according to the eutectic composition are generally added...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/02C22C1/02B23K35/26
Inventor 陈卫民
Owner GUANGZHOU XIANYI ELECTRONICS TECH