ZnO voltage-sensitive ceramic with high electric potential gradient and preparation method of ZnO voltage-sensitive ceramic

Abstract

The invention relates to a ZnO voltage-sensitive ceramic with a high electric potential gradient and a preparation method of the ZnO voltage-sensitive ceramic. The preparation method comprises the steps: S1, mixing ZnO, Bi2O3, CoO and Mn2O3 according to the molar percentage: 95-99.5, 0.1-2, 0.1-2 and 0.1-2, and then, carrying out wet-type ball milling; S2, carrying out wet-type ball milling for 24h, and then, drying the mixed powder at 80 DEG C for 12 h; S3, dropwise adding 0.5-3 mol / L of acetic acid, carrying out grinding and mixing in a mortar, then, placing the mixture into a metal die forpressing, meanwhile, heating the metal die, carrying out sintering at 250-350 DEG C for 1-3 h, and carrying out natural cooling to obtain the ZnO voltage-sensitive ceramic with the high electric potential gradient. The ZnO voltage-sensitive ceramic is prepared by using cold sintering, so that the sintering temperature is greatly reduced, the preparation method is more energy-saving and environment-friendly, and the electric potential gradient of the obtained ZnO voltage-sensitive ceramic reaches up to 3000 V / mm or above which is about 10 times as high as that of a traditional ZnO voltage-sensitive ceramic.

Description

Technical field [0001] The invention relates to pressure-sensitive ceramics, in particular to a high-potential gradient ZnO pressure-sensitive ceramic and a preparation method thereof. Background technique [0002] Varistor ceramics are electronic materials that have nonlinear volt-ampere (VI) characteristics within a specific voltage range, and whose resistance value decreases sharply with the increase of voltage. It is a typical type controlled by the grain size and grain boundary structure. Electronic functional materials. The increase of the voltage level of the transmission circuit and the increase of the transmission capacitance put forward higher requirements for the light weight and the miniaturization of the metal oxide arrester. [0003] Traditional ZnO pressure-sensitive ceramics have complex formulations and preparation processes, including complex processes such as mixing, pre-sintering, sieving, granulating, and debinding. The final sintering temperature is usually 1...

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Problems solved by technology

[0003] Traditional ZnO varistor ceramics have complex formulations and preparation processes, including complex processes such as material mixing, pre-sintering, sieving, granulation, and debinding. The final sintering temperature is usually at 1000 o More than C, keep warm for more than 2 hours, high energy consumption, and the potential gradient of ZnO varistor ceramics is not high, usually around 200-300V / mm, it is difficult to meet the current miniaturization requirements of power electronic devices

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