Temperature-sensitive material for heat-seeking type temperature-sensitive cables, and preparation method thereof

Abstract

The invention relates to a temperature-sensitive material for heat-seeking type temperature-sensitive cables. The temperature-sensitive material is characterized in that the temperature-sensitive material comprises 60-99 wt% of manganese oxide; and resistance adjusting oxide and / or balancing oxide which are / is one or more of alumina, aluminum nitride and nickel oxide, wherein the content of the alumina is 0-19.5%, the content of the aluminum nitride is 0-19.5%, the content of the nickel oxide is 1%, and the content sum of the alumina, aluminum nitride and nickel oxide is 40-1%. The heat-seeking type temperature-sensitive cables made from the temperature-sensitive material have the advantages of good resistance to shock, good bendability, no interaction with electrodes or outer protection tubes, uniform resistance, good consistence and high yield, and can accurately measure the temperature change condition of a highest temperature point in a field to be measured, and the temperature measurement range is from room temperature to 900 DEG C.

Description

technical field [0001] The invention relates to the field of materials, in particular to a heat-sensitive material used for a heat-seeking heat-sensitive cable and a preparation method thereof. Background technique [0002] In modern industrial and agricultural production, safety is benefit, but many production equipment and places ("line temperature", "surface temperature", "large space") often cause fires due to local temperature changes caused by changes in working conditions, so it is necessary to It performs real-time temperature monitoring to prevent fires. For such equipment and places, the commonly used temperature sensor is a heat-seeking thermal cable, which forms a "temporary hot end" through the resistance change of the internal negative temperature coefficient thermal material, which is similar to an ordinary thermocouple at this time. The existing temperature sensor mainly has the following two types. The first one is that the heat-sensitive material is made o...

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Problems solved by technology

Yet above-mentioned sensor has the following problems, such as: the first kind is to adopt and sinter into pottery after being bonded and extruded on the even wire, then winds protective tube on it and makes heat-sensitive cable, and its flexibility and compactness are poor, meets shock or The heat-sensitive material will move when bent, resulting in poor shock resistance and bendability during use, and the temperature measurement range is 100-1000°C, so it cannot be used at low temperatures; the second heat-sensitive cable is prepared by armoring technology, which solves the problem of poor shock resistance and bendability However, because the heat-sensitive material contains components that can undergo oxidation-reduction reactions with the electrodes, such as iron oxide, the electrodes are easily oxidized during armoring processing, resulting in a sharp increase in the resistance between the electrodes, and it is uneven, and the cable consistency is poor. The yield rate is low, the resistance of the thermistor cable made of it is too large and unstable at room temperature, and the thermoelectric performance is unstable in the range from room temperature to 50°C, which greatly limits the application and production and cannot meet the large demand of the market

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