Classification of thermal resistance material.Wide-Angle Fresnel Lens Manufacturing

　　Semiconductor thermistor material

　　Such materials include single crystal semiconductors, polycrystalline semiconductors, glass semiconductors, organic semiconductors, and metal oxides. They all have a very large resistance temperature coefficient and high resistivity, and the sensitivity of the sensors made is quite high. According to the resistance temperature coefficient, it can also be divided into negative resistance temperature coefficient materials and positive resistance temperature coefficient materials. Within a limited temperature range, the negative resistance temperature coefficient material A can reach -6*10-2/℃, the positive resistance temperature coefficient material A can be available High-60*10-2/℃ above. For example, drinking sour ceramics is a semiconductor material of the ideal positive resistance temperature coefficient. The above two materials are widely used in temperature measurement, temperature control, temperature supplementation, switching circuit, overload protection, and time latency. The delayed relay and thermal resistance of the resistance of the resistance and thermal resistance.

　　Due to the resistance of such materials, the temperature range is narrow and uniform because the resistance and the flow are indexed. Then, then

　　Metal thermistor material

　　Such materials are widely used as heat resistance temperature, current, and automatic constant temperature heating elements. Such as platinum resistance thermometer, nickel resistance thermometer, copper resistance thermometer, etc. The platinum temperature testing sensor (including corrosive medium) shows obvious high -precision and high -stability features in various media (including corrosive media). However, because of the scarcity and expensive price of platinum, their widespread application is limited. Copper temperature sensor is cheaper, but long -term use in corrosive media can cause significant changes in static characteristics and resistance. Recently, there are data reports that the copper temperature sensor can be used in the temperature range of -60 ~ 180 ° C in the air medium. However, in order to measure temperature for a long time in -60 ~ 180 ° C for a long time and the short-term measurement temperature at 250 ° C, a large amount of nickel temperature measurement sensor is generally used, and nickel is considered an ideal material because they have high sensitivity and satisfaction. Reconstruction and stability.

　　Alloy thermal resistance material

　　Alloy thermistor material is also known as thermistor resistance alloy. This alloy has a high resistivity, and the resistance value is more sensitive with changes in temperature. It is a good material for making temperature sensitors. As a thermist resistance alloys as a temperature -sensitive sensor, the performance requirements are as follows: (1) enough large resistors; (2) a considerable high resistance temperature coefficient; (3) have the expansion coefficient close to the line of experimental material; Sensitive coefficients; (5) When heating and cooling in the working temperature interval, the resistance temperature curve should have good repetitiveness.

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