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 pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] A low-temperature alloy consisting of three metals: tin, bismuth, and indium. 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 this alloy as a fuse core is:

[0032] ⑴ Melting tin: Put metallic tin in a stainless steel crucible, heat it on an electric furnace at 280-300℃, melt all the metallic tin, and stop heating;

[0033] ⑵Melting bismuth: add metal bismuth to all the molten metal tin, melt it (that is, the metal bismuth is in a molten state), fuse the metal bismuth and metal tin, and stir, stirring frequency 60-70r / min, stirring time 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, because the tin temperature rises to 280-300° C., the heating is stopped, and subsequent heating is not continued, so the tempera...

Example Embodiment

[0039] Example 2:

[0040] A low-temperature alloy consisting of three metals: tin, bismuth, and indium. The weight of each component is as follows:

[0041] Metal tin 16 tons

[0042] 33 tons of bismuth metal

[0043] 51 tons of indium metal.

[0044] The preparation method of the low-temperature alloy is the same as that of Example 1, to obtain a 25mm low-temperature alloy rod, and then at room temperature, the cast low-temperature alloy rod is extruded into a low-temperature alloy wire with a diameter of 1.8mm through a vertical extruder. The temperature is room temperature, 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 detected to be 61°C.

Example Embodiment

[0045] Example 3:

[0046] A low-temperature alloy consisting of three metals: tin, bismuth, and indium. The weight of each component is as follows:

[0047] Metal tin 17 tons

[0048] 33 tons of bismuth metal

[0049] Indium metal 50 tons.

[0050] The preparation method of the low-temperature alloy is the same as that of Example 1, to obtain a 25mm low-temperature alloy rod, and then at room temperature, the cast low-temperature alloy rod is extruded into a low-temperature alloy wire with a diameter of 1.8mm through a vertical extruder. The temperature is room temperature, 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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