Composite material by microwave heating and its production

Abstract

A composite material by microwave heating and its production are disclosed. The composite material consists of graphite, ceramic, plastic rubber and polytetrafluoroethylene. The process is carried out by plastic forming or pressurizing, heating while sintering or melting to obtain compact solid composite material, coating to form a graphite coating layer. It can be used to absorb wave, magnetic wave, stop magnetic wave from penetrating and control microwave transmitting time and power.

Description

Technical field: [0001] The invention relates to a composite material which utilizes microwave to generate heat, and at the same time relates to a method for preparing the composite material which utilizes microwave to generate heat. Background technique: [0002] At present, microwave technology is widely used in science, medicine, communication, industry, agriculture, forestry and fishery and other fields because of its characteristic of selective medium heating; generally speaking, microwave itself is not ionizing radiation, so it is not radioactive. Between 0.3GHz and 300GHz, so it has both shorter-wave reflection phenomenon and longer-wave heating effect. When microwave enters from the surface of the medium and propagates inside it, the energy it carries is converted into heat energy as it penetrates into the medium. ; When microwave is used in the heating treatment of food, it does not use physical phenomena such as heat conduction and radiation to heat the container a...

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Problems solved by technology

[0002] At present, microwave technology is widely used in science, medicine, communication, industry, agriculture, forestry and fishery and other fields because of its characteristic of selective medium heating; generally speaking, microwave itself is not ionizing radiation, so it is not radioactive. Between 0.3GHz and 300GHz, so it has both shorter-wave reflection phenomenon and longer-wave heating effect. When microwave enters from the surface of the medium and propagates inside it, the energy it carries is converted into heat energy as it penetrates into the medium. ; When microwave is used in the heating treatment of food, it does not use physical phenomena such as heat conduction and radiation to heat the container and medium to achieve the purpose of heating food indirectly from the outside to the inside as in traditional cooking, but to use polar substances ( For example, water, fat, and protein in food) are placed in the electromagnetic field formed by microwaves. Substance molecules collide back and forth with the vibration of the magnetic field, and heat is generated due to mutual friction to cook food. In contrast, non-polar air and glass, ceramics, and plastics The container has no effect on the microwave, so the temperature of the container itself does not change much from raw to cooked (the heat after microwave is conducted from the food), and therefore, the food is easy to feel dry after microwave treatment The lack of hard and poor appearance, and the larger the food volume, the less ideal the situation; of course, the container cannot provide an auxiliary heating role in the microwave process, which is also one of the keys to whether the microwave food is delicious, but unfortunately there is no suitable material at present. The use as a medium is also the main reason why microwaves cannot replace electric heating tubes

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