Heating expert: alumina ceramic heating body


Release time:

2022-07-15

Many household appliances in life need to rely on their heating components to heat, such as coffee machines, drinking fountains, ovens and so on. In the past, the components that bear the "big responsibility" of heating are often based on metal as the basic structural raw material. During use, due to long-term heat, the components are easily oxidized, which affects their service life. In order to avoid these problems, it is natural to look for alternative materials, alumina ceramic is a good choice. After printing resistance paste on alumina ceramic, high temperature co-firing synthesis, electrode and lead processing, a new generation of medium and low temperature heating element-alumina ceramic heating element can be produced.

Working principle: The alumina ceramic heating element is designed with the currently popular resistance heating principle, that is, when the current passes through the heating wire circuit, the heating wire circuit will heat up. The alumina ceramic heater has the characteristics of positive metal temperature, and the product resistance will increase with the temperature. It becomes 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. Different shapes and styles can be selected according to different applications. Their common characteristics are electrical conversion High efficiency, fast heating speed, high temperature resistance, corrosion resistance and long service life. In application, ceramic heating parts are mainly used for household electric heating appliances, such as small heaters, hair dryers, clothes dryers, heaters, cold and warm mobile phones, clothes dryers, electric splints, electric irons, hair straighteners, curlers, electronic hot water bottles, heat preservation cabinets, electric rice cookers, toilet ceramic heaters, water heaters, etc. Industrial aspects, such as industrial baking equipment, electric glue, water oil and acid-base liquid heaters, etc. In medical treatment, such as infrared physiotherapy instrument, intravenous injection heater, etc.

Preparation points: Taking alumina ceramic heating element as an example, in many high-power applications, the quality requirements of alumina heater are very high, especially the thermal shock resistance. The thermal shock resistance of materials depends on internal thermal stress, geometry, environmental media and other factors, so the thermal shock resistance of ceramic materials is the comprehensive performance of its mechanical and thermal properties corresponding to various heating conditions and external constraints. Because the alumina ceramic heating element is made by printing the heating resistance paste on the ceramic body according to the design requirements of the heating circuit, and then laminating and co-firing into one body, the thermal shock resistance of the alumina ceramic heating element is not only related to the performance of the alumina ceramic itself, but also related to many conditions, such as the bonding ability of the resistance paste and the alumina ceramic, and the heating uniformity of the heating circuit, residual stress and its distribution during screen printing and sintering, stress during installation and 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 sheet is easy to burst.

The small alumina ceramic heating element not only meets the requirements of environmental protection, does not contain harmful substances such as lead, cadmium, mercury, polybrominated biphenyls, 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 will continue to bring warmth to our lives.