Wide-temperature-range low-temperature sintering medium-voltage zinc oxide voltage-sensitive ceramic material and preparation method thereof

By using specific formulations and controlling the sintering process, the high-temperature sintering problem of ZnO varistors was solved, achieving a balance between low-temperature sintering and high voltage gradient, thus improving the consistency of product performance and environmental friendliness.

CN122059699APending Publication Date: 2026-05-19NANTONG UNIV
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Patent Information

Application Number
CN202610383879.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-26
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

High-temperature sintering of existing ZnO varistors leads to increased porosity, reduced microstructure uniformity, and deteriorated electrical properties. Furthermore, sintering temperature fluctuations affect product performance consistency, making it difficult to achieve a balance between low-temperature sintering and high voltage gradient.

Method used

A formula consisting of ZnO, Bi2O3, Sb2O3, CoO, MnO2, NiO, Cr2O3, Al2O3, and CaO in a specific molar ratio, combined with high-energy ball milling and controlled heating rate during sintering, was used to reduce the sintering temperature and ensure uniform distribution of additives and development of microstructure.

Benefits of technology

It achieves low-temperature sintering over a wide temperature range, with a voltage gradient of 200~230V/mm, a nonlinear coefficient α of 25~35, and a leakage current IL≤5μA, thereby improving the consistency of product performance and green manufacturing capabilities.

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Abstract

The invention belongs to the field of electrical materials and preparation, and particularly discloses a wide-temperature-range low-temperature sintered medium-voltage zinc oxide voltage-sensitive ceramic material and a preparation method thereof. The voltage-sensitive ceramic material is composed of ZnO, Bi2O3, Sb2O3, CoO, MnO2, NiO, Cr2O3, Al2O3 and CaO according to the molar ratio of the ZnO to the Bi2O3 to the Sb2O3 to the CoO to the MnO2 to the NiO to the Cr2O3 to the Al2O3 to the CaO of (97.000 to 98.500) to (0.050 to 0.500) to (0.0125 to 0.0500) to (0.200 to 1.600) to (0.010 to 0.300) to (0.100 to 0.800) to (0.010 to 0.050) to (0.025 to 0.100) to (0.010 to 0.200), the total molar amount of all the components is 100 percent, and the molar ratio of Bi to Sb is (4 to 8) to 1. The preparation method comprises the following steps: preparing a main material ZnO and an additive metal element salt, and carrying out high-energy ball milling to obtain slurry; and calcining the slurry, controlling the average particle size of the obtained composite powder to be less than 0.3 mu m, granulating the composite powder, removing plastic, and sintering to finally obtain the product with the voltage gradient E1mA of 200-230 V / mm. The zinc oxide voltage-sensitive ceramic material is good in performance, the energy consumption in the preparation process is reduced, the influence of sintering temperature fluctuation on the performance of the zinc oxide voltage-sensitive ceramic material is reduced, the consistency of the product performance is ensured, and a thought is expected to be provided for industrial low-carbon production.
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