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Lead-free low-temperature alloy for making fuse core of thermal fuse and preparation method thereof

A thermal fuse and low-temperature alloy technology, applied in the field of alloys, can solve problems such as endangering human health and environmental pollution, and achieve the effects of narrow melting point range, uniform composition, and low cost

Inactive Publication Date: 2011-12-28
TIANJIN BAIRUIJIE WELDING MATERIAL
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Problems solved by technology

[0002] Fusible core is the heart of the thermal fuse and the technical core of the thermal fuse production process. Traditional thermal fuses are mostly tin-lead alloys. Lead, a substance harmful to the environment, is harmful to human health during production and use. The environment is very polluted

Method used

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Embodiment Construction

[0016] The present invention is further described below in conjunction with specific embodiment; It should be emphasized that: for those of ordinary skill in the art, can improve or change according to the above description, and all these improvements and changes should belong to the appended claims of the present invention protected range.

[0017] A lead-free low-temperature alloy used to make a fuse core of a thermal fuse, the specific composition of which is Sn 61 Bi 35 Zn 4 , see the following table for specific ingredients and weight ratio:

[0018] chemical composition%

sn

Bi

Zn

sn 61 Bi 35 Zn 4

59.5-62.5

34-36

3.5-4.5

[0019] A method for preparing a lead-free low-temperature alloy for making a fuse core of a thermal fuse, the steps of which are:

[0020] Put metal tin into a stainless steel crucible according to the weight ratio, heat it on the electric furnace until the tin melts, and then add metal zin...

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Abstract

The invention relates to a lead-free low-temperature alloy used for making a fuse core of a thermal fuse. Its raw material composition and its weight percentage range are respectively: Bi: 34%-36%; Zn: 3.5%-4.5%; Sn: balance The preparation method has the following steps: put metal tin into a stainless steel crucible, heat it in an electric furnace, after the tin is melted, add metal zinc at 250-280°C, and after melting, then add metal bismuth to melt After cleaning, conventional degassing and slag removal are performed by adding a degassing agent, and cast into a low-temperature alloy rod of the required size. The lead-free low-temperature alloy containing Sn, Bi and Zn involved in the present invention is used for making the fuse core of the thermal fuse, and the melting point is 132±2° C. It has low characteristics and is a lead-free environmental protection material, which itself has good social and economic benefits.

Description

technical field [0001] The invention belongs to the field of alloys, and relates to a lead-free low-temperature alloy, in particular to a lead-free low-temperature alloy for making a fuse core of a thermal fuse and a preparation method thereof. Background technique [0002] Fusible core is the heart of the thermal fuse and the technical core of the thermal fuse production process. Traditional thermal fuses are mostly tin-lead alloys. Lead, a substance harmful to the environment, is harmful to human health during production and use. The environment is extremely polluted. [0003] Low-temperature alloys can be used for the protection of electronic circuits in the electronics industry, and are mostly used to make fuse cores for thermal fuses. At present, the manufacturers of low-temperature alloys leading the world's advanced technology are Alpha in the United States and Senju in Japan. [0004] Through searching, a published patent document related to this patent application...

Claims

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Application Information

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IPC IPC(8): C22C13/02C22C1/02
Inventor 黄永利赵世有李洪福付宏宇
Owner TIANJIN BAIRUIJIE WELDING MATERIAL
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