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Low temperature alloy and preparation method and application thereof

A low-temperature alloy and metal technology, applied in the field of low-temperature and gold, lead-free low-temperature alloy and its preparation, can solve the problems of ineffective protection of electronic circuits and valuable devices, unrecognizable fuse marks, ignition, etc., to avoid environmental pollution and The harm of harmful metals to the human body, good social and economic benefits, and the effect of expanding application fields

Inactive Publication Date: 2013-02-06
TIANJIN BAIRUIJIE WELDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Most thermal fuses are mostly tin-lead alloys. Lead, a substance harmful to the environment, is harmful to human health during production and use and has great pollution to the environment.
[0004] 2. The melting point of the fuse is high, and when it is applied to the fuse, it cannot effectively protect electronic circuits and valuable devices; some fuses will even have continuous arcing, ignition, fuse burnout, melting together with the contacts, and unrecognizable fuse marks when they are blown. Phenomenon
[0005] After searching, no patent documents related to the content of this application were found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A low-temperature alloy is composed of three metals: metal tin, metal bismuth and metal indium, and the weight of each component is as follows:

[0028] Metal tin 15 tons

[0029] Bismuth metal 34 tons

[0030] 51 tons of indium metal.

[0031] The preparation method of applying the alloy as fuse fuse core is as follows:

[0032] ⑴ Melting tin: put metal tin into a stainless steel crucible, heat it on an electric furnace at 280-300°C, melt all metal tin, and stop heating;

[0033] (2) Melting bismuth: Add metal bismuth to all the molten metal tin, melt it (that is, the metal bismuth is in a molten state), melt the metal bismuth and metal tin completely, and stir, the stirring frequency is 60-70r / min, and the stirring time is 2- 3min;

[0034] (3) Melting indium: Add metal indium to the fused metal bismuth and metal tin, melt it, and completely fuse the three metals;

[0035] In the above steps, since the heating is stopped when the tin temperature rises to 280-300°...

Embodiment 2

[0040] A low-temperature alloy is composed of three metals: metal tin, metal bismuth and metal indium, and the weight of each component is as follows:

[0041] Metal tin 16 tons

[0042] Bismuth metal 33 tons

[0043] 51 tons of indium metal.

[0044] The preparation method of this low-temperature alloy is the same as embodiment 1, obtains the low-temperature alloy rod of 25mm, then at room temperature, the low-temperature alloy rod after casting is extruded into the low-temperature alloy wire that diameter is 1.8mm by vertical extruder, extrusion The temperature is room temperature, and the low-temperature alloy wire can be used as a fuse core of a thermal fuse, and the melting point of the low-temperature alloy wire is 61°C after testing.

Embodiment 3

[0046] A low-temperature alloy is composed of three metals: metal tin, metal bismuth and metal indium, and the weight of each component is as follows:

[0047] Metal tin 17 tons

[0048] Bismuth metal 33 tons

[0049] Metal indium 50 tons.

[0050] The preparation method of this low-temperature alloy is the same as embodiment 1, obtains the low-temperature alloy rod of 25mm, then at room temperature, the low-temperature alloy rod after casting is extruded into the low-temperature alloy wire that diameter is 1.8mm by vertical extruder, extrusion The temperature is room temperature, and the low-temperature alloy wire can be used as a fuse core of a thermal fuse, and the melting point of the low-temperature alloy wire is 62°C after testing.

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Abstract

The invention relates to a low temperature alloy and a preparation method and an application thereof. The low temperature alloy consists of three metals of tin, bismuth and indium in percentage by weight: 15-17% of tin, 32-34% of bismuth and the balance of indium. The preparation method thereof comprises the following steps: (1) fusing tin; (2) fusing bismuth; (3) fusing indium; (4) degasifying; and (5) casting. The low temperature alloy provided by the invention is a leadless environment-friendly material, and can replace the traditional tinlead alloy; the damages of environmental pollution and poisonous metals for people are avoided, and the characteristic that the alloy melting point is relatively low is ensured; the low temperature alloy can be widely applied to the production of temperature fuses; the added value of the product is improved; and the low temperature alloy has good social benefit.

Description

technical field [0001] The invention belongs to the field of alloy smelting, relates to low temperature and gold, in particular to a lead-free low temperature alloy and its preparation method and application. Background technique [0002] At present, in the electronics industry, people often use low-temperature alloys to protect electronic circuits and valuable devices, especially for making fuse cores of thermal fuses. The fuse core with a lower melting point is very important for the fuse. When the current rises abnormally to a certain level, the fuse itself will fuse and cut off the current, thereby protecting the safe operation of the circuit. Therefore, the fuse core is usually compared to the fuse. The heart is also the technical core of the fuse production process. At present, the manufacturers of low-temperature alloys leading the world's advanced technology are Alpha in the United States and Senju in Japan, and the prices are relatively high. The price of low-tempe...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C30/04
Inventor 黄永利赵世有李洪福付宏宇
Owner TIANJIN BAIRUIJIE WELDING MATERIAL
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