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Alloy type temperature fuse and material for temperature fuse use

A technology of temperature fuses and fuses, applied in electrical components, heating/cooling contact switches, circuits, etc., can solve problems such as difficult heat-resistant cycle characteristics

Inactive Publication Date: 2004-06-23
UCHIHASHI ESTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In the long-term thermal cycle characteristics, although it is required that even after passing through a high temperature lower than the operating temperature (usually, the above-mentioned holding temperature can be used) and a thermal history at room temperature or freezing point (such as -40°C), it will not Changes in the resistance value of the fuse element or malfunction of the thermal fuse occur, but it is extremely difficult to adapt it to the long-term heat-resistant cycle characteristics if the so-called 79°C eutectic or 81°C eutectic is used.

Method used

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  • Alloy type temperature fuse and material for temperature fuse use
  • Alloy type temperature fuse and material for temperature fuse use
  • Alloy type temperature fuse and material for temperature fuse use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] The alloy composition of the fuse element is made to be In25%, Sn20%, and the balance is Bi. The wire drawing workability of the drawn fuse element was ◯.

[0102] The DSC measurement results of the fuse element are shown in Fig. 10. The liquidus temperature is about 84°C, the solidus temperature is about 80°C, and the maximum absorption peak temperature is about 81°C. The DSC measurement results, because the alloy composition is close to the above-mentioned 79°C Bi-In-Sn system ternary eutectic point Bi57.5%-In25.2%-Sn17.3%, it belongs to Figure 14 In the graph of (B), there is no solid phase transformation region on the side of the temperature lower than the solidus temperature.

[0103] The temperature of the fuse element when the thermal fuse operates is 82±1°C. Therefore, it can be seen that the temperature of the fuse element at the time of operation of the thermal fuse is approximately the same as the maximum endothermic peak temperature of approximately 82°C....

Embodiment 2

[0106] The alloy composition of the fuse element is 30% In, 15% Sn, and the balance is Bi.

[0107] The wire drawing workability of the drawn fuse element was ○.

[0108] As shown in 11, the DSC measurement results of the fuse element show that the liquidus temperature is about 86°C, the solidus temperature is about 81°C, and the maximum absorption peak temperature is about 82°C. The DSC measurement results, because the alloy composition is close to the above-mentioned 79 ℃ Bi-In-Sn system ternary eutectic point Bi54.0%-In29.7%-Sn16.3%, it belongs to Figure 14 In the graph of (B), there is no solid phase transformation region on the side of the temperature lower than the solidus temperature.

[0109] The temperature of the fuse element when the thermal fuse operates is 82±1°C. Therefore, it can be seen that the temperature of the fuse element at the time of operation of the thermal fuse is approximately the same as the maximum endothermic peak temperature of approximately 8...

Embodiment 3～7

[0112] With respect to Example 1, except that the alloy composition was changed to that shown in Table 1, the rest was the same as that of Example 1.

[0113] In any of the examples, good wire drawability was exhibited.

[0114] The solidus temperature and liquidus temperature of these embodiments are as shown in Table 1. The temperature of the fuse element when the thermal fuse operates, as shown in Table 1, fluctuates up and down within ±3°C and is in the solid-liquid coexistence area.

[0115] The fusion patterns of the fuse elements of these embodiments are of the Figure 14 In the graph (A), although the solid-liquid coexistence region is wide, the endothermic peak is single and steep, and as a result, the fluctuation of the operating temperature can be suppressed to within ±3°C.

[0116] The load aging test is qualified. This is presumably because the amount of In was as small as 15 to 30%, and the reaction between In and the co-solvent was suppressed as in Example 1,...

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Abstract

An alloy type thermal fuse of an operating temperature of 75 to 120 DEG C is provided in which a fuse element of a Bi-In-Sn alloy is used, excellent aging and heat cycle resistances for a long term can be ensured, and satisfactory operating characteristic can be ensured. A material for a thermal fuse element has an alloy composition in which In is 15% or larger and smaller than 37%, Sn is 5% or larger and 28% or smaller, and balance Bi, and in which, with respect to each of reference points of ternary Bi-In-Sn eutectic points of 57.5%Bi-25.2%In-17.3%Sn and 54.0%Bi-29.7%In-16.3%Sn, a range of + / -2%Bi, + / -1%In, and + / -1%Sn is excluded.

Description

technical field [0001] The invention relates to a Bi-In-Sn alloy temperature fuse element material and an alloy type temperature fuse with an operating temperature of 75°C to 120°C. Background technique [0002] Alloy type thermal fuses are commonly used as thermal protectors for electrical equipment or circuit components. [0003] The composition of the alloy type temperature fuse is to use the alloy with a predetermined melting point as the fuse element, connect the fuse element between a pair of lead conductors, apply a flux to the fuse element, and coat the flux with an insulator The applied fuse element is sealed. [0004] The action mechanism of the alloy type thermal fuse is as follows. [0005] Arrange the alloy type temperature fuse in thermal contact with the electrical equipment or circuit components to be protected. When electrical equipment or circuit components generate heat due to any abnormality, the thermal fuse alloy is melted by the generated heat, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C12/00C22C30/04H01H37/76H01H69/02
CPCH01H2037/768H01H37/761C22C12/00
Inventor 田中嘉明
Owner UCHIHASHI ESTEC
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