Preparation method of silicon oxide coated modified ZnO pressure-sensitive ceramic material
A technology of pressure-sensitive ceramics and silicon oxide, which is applied in the field of preparation of silicon oxide-coated modified ZnO pressure-sensitive ceramic materials. etc. to achieve the effects of lower sintering temperature, improved breakdown voltage and nonlinear electrical properties
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Embodiment 1
[0027] Dissolve 2.6g of zinc nitrate, 0.36g of cobalt nitrate, 1.45g of bismuth nitrate, 0.3g of nickel acetate tetrahydrate and 0.2g of manganese chloride in ethylene glycol and distilled water, add 5g of PEG-6000 and 10mL of triethanolamine and continue to stir, ultrasonically react for 120min , and centrifuged to obtain pink precipitated powder, which was dried in an oven at 80 °C. The obtained monodisperse zinc oxide composite powder. Take 1 g, add 100 mL of ethanol, add 100 mL of water and 6 mL of ammonia for surface activation, continue to stir, take 2.5 mL of LTEOS dropwise and add it to the above mixture, stir and react for 20 h, put the powder in an 80°C oven for drying, and press and mold it. Sintered at 1100℃ for 2h to obtain SiO2-coated modified ZnO varistor ceramic material, coat silver paste on both sides of the ceramic, heat treatment at 500℃ for 15min, and test its electrical properties after cooling.
Embodiment 2
[0029] Dissolve 2.6g zinc nitrate, 0.36g cobalt nitrate, 1.45g bismuth nitrate, 0.3g nickel acetate tetrahydrate and 0.2g manganese chloride in ethylene glycol and distilled water, add 5g PEG-6000 and 10mL triethanolamine, continue stirring, ultrasonic reaction After 120 min, centrifuge to obtain pink precipitated powder, which was dried in an oven at 80 °C. The obtained monodisperse zinc oxide composite powder. Take 1 g, add 100 mL of ethanol, add 100 mL of water and 6 mL of ammonia for surface activation, continue to stir, take 5.0 mL of TEOS dropwise and add it to the above mixture, stir and react for 20 hours, and place the powder in an 80°C oven for drying. Sintered at 1100℃ for 2h to obtain SiO2-coated modified ZnO varistor ceramic material, coat silver paste on both sides of the ceramic, heat treatment at 500℃ for 15min, and test its electrical properties after cooling.
Embodiment 3
[0031] Dissolve 2.6g zinc nitrate, 0.36g cobalt nitrate, 1.45g bismuth nitrate, 0.3g nickel acetate tetrahydrate and 0.2g manganese chloride in ethylene glycol and distilled water, add 5g PEG-6000 and 10mL triethanolamine, continue stirring, ultrasonic reaction 120 min, centrifuged to obtain pink precipitated powder, which was dried in an oven at 80 °C. The obtained monodisperse zinc oxide composite powder. Take 1 g, add 100 mL of ethanol, add 100 mL of water and 6 mL of ammonia for surface activation, keep stirring, take 7.5 mL of TEOS dropwise and add it to the above mixture, stir and react for 20 hours, put the powder in an 80°C oven for drying, and then press and form. And 1100 ℃ high temperature sintering for 2 hours to obtain SiO2 coated modified ZnO varistor ceramic material, silver paste was coated on both sides of the ceramic, 500 ℃ high temperature heat treatment for 15 min, and its electrical properties were tested after cooling.
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