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Conducting composite material with resistance positive-temperature effect and overcurrent-protecting element

A conductive composite material and positive temperature effect technology, applied in the direction of resistors with positive temperature coefficients, current response resistors, etc., can solve the problems of unsatisfactory conductivity and low resistivity, and achieve excellent resistance reproducibility, Low resistivity and excellent weather resistance

Active Publication Date: 2012-06-27
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size and thickness of overcurrent protection components made of metal carbide, metal nitride or metal boride ceramic powder are limited (such as 1.0mm, 0.9mm, 0.8mm, 0.7mm), and the area is further reduced (such as 1210, 1206 , 0805, 0603 size), its conductivity cannot meet the requirements, so it is imperative to develop conductive fillers with lower resistivity and excellent oxidation resistance

Method used

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  • Conducting composite material with resistance positive-temperature effect and overcurrent-protecting element
  • Conducting composite material with resistance positive-temperature effect and overcurrent-protecting element
  • Conducting composite material with resistance positive-temperature effect and overcurrent-protecting element

Examples

Experimental program
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Effect test

Embodiment 1

[0037] image 3 It is the resistance-temperature curve diagram of the overcurrent protection element of the present embodiment 1. The overcurrent protection element has a very low resistance value at 25°C. As the temperature increases, the resistance rises slowly. When the temperature increases to about 130°C, the resistance of the overcurrent protection element changes suddenly, increasing by about 10 orders of magnitude. When the overcurrent protection element changes from a conductor to an insulator, the circuit is in an open circuit state to achieve the purpose of protecting the circuit element.

[0038] Example 2

[0039] The composition of the conductive composite material for preparing the overcurrent protection element is the same as in Example 1, but the steps for preparing the conductive composite material with positive temperature effect of resistance and the overcurrent protection element are changed to: grind the polymer and mix it with the conductive filler in t...

Embodiment 2

[0041] The steps of preparing a conductive composite material with a positive temperature effect on resistance and an overcurrent protection element are the same as in Example 1, but the volume fraction of the polymer is changed from 40% to 46%, and the volume fraction of the conductive filler 2 is changed from 60% to 54%. The formulation of the conductive composite material of this embodiment and the electrical characteristics of the overcurrent protection element are shown in Table 1.

Embodiment 3

[0043] The steps of preparing a conductive composite material with a positive temperature effect on resistance and an overcurrent protection element are the same as in Example 1, but the volume fraction of the polymer 2 is changed from 40% to 52%, and the volume fraction of the conductive filler 2 is changed from 60% to was 48%. The formulation of the conductive composite material of this embodiment and the electrical characteristics of the overcurrent protection element are shown in Table 1.

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Abstract

The invention relates to a conducting composite material with a resistance positive-temperature effect and an overcurrent-protecting element. The conducting composite material with the resistance positive-temperature effect comprises a polymeric base material and a conducting filler, wherein the polymeric base material counts for 20 to 75 percent of the volume fraction of the conducting composite material; and the conducting filler has a core-shell type granular structure which is formed by an inner core and an outer shell, the conducting filler counts for 25 to 80 percent of the volume fraction of the conducting composite material, the grain diameter is 0.1 to 20 mu m, the volume resistivity is not greater than 100mu omega. cm, and the conducting filler is dispersed in the polymeric base material. The conducting composite material with the resistance positive-temperature effect disclosed by the invention has low resistivity and excellent weather resistance, the overcurrent-protecting element prepared from the conducting composite material with the resistance positive-temperature effect has extremely-low room-temperature resistivity and simultaneously still has good weather-resisting performance and excellent resistance reproducibility and PTC (Positive Temperature Coefficient) strength.

Description

technical field [0001] The invention relates to a resistance positive temperature effect conductive composite material and an overcurrent protection element. Background technique [0002] The conductive composite material with the positive temperature effect of resistance can maintain an extremely low resistance value at normal temperature, and has the characteristics of being sensitive to temperature changes, that is, when an overcurrent or overtemperature occurs in the circuit, its resistance will instantly increase to A high resistance value makes the circuit in an open circuit state to achieve the purpose of protecting circuit components. Therefore, a conductive composite material with a positive temperature effect of resistance can be connected to a circuit as a material for a current sensing element. Such materials have been widely used in electronic circuit protection components. [0003] The conductive composite material with the positive temperature effect of resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01C7/13
Inventor 杨铨铨刘正平方勇刘玉堂刘利锋王炜高道华龚炫王军
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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