CERAMIC MATERIAL FOR ZINC OXIDE-BASED VARISTORS Russian patent published in 2014 - IPC C04B35/453 

FIELD: chemistry.

SUBSTANCE: invention relates to electronic engineering, particularly to semiconductor ceramic materials, and can be used in making zinc oxide-based varistors. The ceramic material for making zinc oxide-based varistors includes additives of Bi, Sb, Mn, Co, Si, Cr, Al, Zr and Y oxides and further includes boron oxide, with the following ratio of components, mol%: ZnO 94.00-98.00, MnO₂ 0.20-0.75, Co₂O₃ 0.50-1.00, Bi₂O₃ 0.50-1.60, Cr₂O₃ 0.10-0.50, Sb₂O₃ 0.50-1.50, B₂O₃ 0.01-0.13, Al₂O₃ 0.005-0.02, SiO₂ 0.03-0.10, ZrO₂ 0.01-0.20, Y₂O₃ 0.01-0.20. The ratio of concentration of the additives ZrO₂:Y₂O₃ is equal to 1:1-1:3.

EFFECT: enabling use of varistors based on said material in high-power circuits having elements with low electrical strength margin by increasing the allowable energy scattered by the varistor while reducing the protection factor of the varistor by reducing stray current.

2 tbl