Heating little power: alumina ceramic heating body
Many household appliances in life need to rely on their heating components to generate heat, such as coffee machines, water dispensers, ovens, and so on. In the past, the components that took on the "big task" of heating were often made of metal as the basic structural raw material. During use, due to long-term heat, the parts are easily oxidized, which affects its service life. In order to avoid these problems, it is natural to look for alternative materials, and alumina ceramics are a good choice. After printing resistance paste on alumina ceramics, high-temperature co-firing, and processing electrodes and leads, a new generation of medium and low temperature heating elements - alumina ceramic heating elements can be produced.
Working principle: The alumina ceramic heating element is designed with the current popular resistance heating principle, that is, when the current passes through the electric heating wire circuit, the electric heating wire circuit will generate heat. The alumina ceramic heater has a positive temperature characteristic of the metal, and the product resistance will increase with the temperature. And become larger, thereby reducing the actual power of the product without affecting the heating effect.
Classification and application: At present, the common alumina ceramic heating elements include ceramic heating heat pipes, ceramic heating plates, ceramic heating plates, ceramic heating coils, etc., and different shapes and styles can be selected according to different applications. Their common feature is electric conversion High efficiency, fast heating speed, high temperature resistance, corrosion resistance and long service life. In terms of application, ceramic heating elements are mainly used for: household electric heating appliances, such as small heaters, hair dryers, clothes dryers, heaters, heating and cooling mobile phones, clothes dryers, electric splints, electric irons, hair straighteners, curlers, Electronic hot water bottles, warming cabinets, rice cookers, bathroom ceramic heaters, water heaters, etc.; industrial aspects, such as industrial baking equipment, electric glue, water oil and acid-base liquid heaters, etc.; medical aspects, such as infrared physiotherapy equipment, intravenous injection heater etc.
Preparation points: Take alumina ceramic heating elements as an example. In many high-power applications, the quality requirements for alumina heaters are very high, especially thermal shock resistance. The thermal shock resistance of a material depends on factors such as internal thermal stress, geometry, and environmental media. Therefore, the thermal shock resistance of a ceramic material is a comprehensive performance of its mechanical and thermal properties corresponding to various heating conditions and external constraints. Since the alumina ceramic heating element is made by printing the heating resistor paste on the ceramic body according to the design requirements of the heating circuit, and then laminating and co-firing it into one body, the thermal shock resistance of the alumina ceramic heating plate is not only It is related to the performance of alumina ceramics itself, and also to many conditions, such as the bonding ability of resistance paste and alumina ceramics, the heating uniformity of the heating circuit, the residual stress and its distribution during screen printing and sintering, installation and stress in use, etc. For example, the design of the printed circuit should make the temperature gradient during heating as small as possible, so that it is not easy to form the concentration effect of thermal stress, otherwise the heating plate is easy to burst.
The small alumina ceramic heating element not only meets environmental protection requirements, does not contain harmful substances such as lead, cadmium, mercury, polybrominated biphenyls, and polybrominated diphenyl ethers, but also has many advantages such as corrosion resistance, high temperature resistance, long life, high efficiency and energy saving. In the future, it will definitely be more widely used and continue to bring warmth to our lives.