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Insulating ceramics, also known as device ceramics, are high density insulating ceramics.Alumina ceramics are one of the most widely used electronic ceramics.Electrical insulating ceramics occupy a certain proportion in electronic ceramics, while electronic ceramics occupy a large proportion in high-tech ceramics.Insulating ceramics: high resistivity, low high frequency loss, high resistivity, used for integrated circuit board, packaging, high frequency insulating ceramics, etc.Insulating ceramics are widely used in the power electronics industry for the installation, support, protection, insulation, isolation and physical connection of electrical appliances.For example, insulators, insulation sleeves, resistance substrates, coil frames, power supply tube clamps, integrated circuit boards, etc.
Electrical insulating ceramics are widely used in dielectric ceramics.Alumina ceramics are mainly used for insulator, resistance, integrated circuit board, package tube, shell and other electronic components and the matrix, shell, fixed parts, seals or insulation parts of the circuit.Physical isolation of conductors in an electrical or electronic circuit.In addition, it also plays a conductor mechanical support, heat dissipation and circuit environmental protection role.Generally speaking, the ceramic that can have above effect is called insulating ceramic.
Most ceramics are insulators.Electrons close to room temperature do not readily jump to the conduction band due to thermal excitation.Therefore, ionic conductivity generated by ion diffusion is the main form of conductivity to be considered in insulating ceramics.Under the influence of the valence state, size and diffusion coefficient of the ions, the smaller the charge and volume of the ions, the easier the diffusion and the smaller the activation energy.Affected by microstructure: mainly depends on grain boundary phase and surface porosity.Glass should minimize the presence of alkali metal oxides, and choose a porous, non-absorbent dense material.