| abstract |
The invention provides a strontium titanate varistor, the composition of which is: Sr1‑x‑y‑z TiO3+x(CeO2+Nb2O5)+y(ZnO+1/2NaCO3)+zSiO2, wherein x=0.1‑0.1‑ 0.5mol%, y=0.2-0.8mol%, z=0.2-0.9mol%. When preparing, first add weighed strontium chloride and titanium chloride into hydrochloric acid and aqueous solution, stir and heat at 60°C, add an equimolar amount of oxalic acid and a small amount of anhydrous ethanol aqueous solution, adjust the pH value to 1 with hydrochloric acid, mix and precipitate, cleaning and filtering to obtain a precipitate, drying the precipitate at 105-130 °C, and then thermally decomposing it at 750-850 °C for 3-8 hours to obtain a strontium titanate powder material; the obtained strontium titanate powder is mixed with x(CeO2+Nb2O5)+y(ZnO+1/2NaCO3)+zSiO2 mixed ball-milling for 6-12 hours, dried at 110℃-150℃, punched into sheets; the formed samples were placed in the corundum ark, and then into the vacuum sintering furnace. In the invention, the powder is directly dry-pressed, no binder is added, and high temperature debinding is not required; the vacuum sintering atmosphere replaces the atmosphere furnace sintering, the oxidation sintering process is carried out in the air, the experiment is safer, and the process performance is good and simple And product quality is easy to control. |