Method and composition for electrically resistive material for television cathode ray tubes

摘要

An improved electrically resistive arc-suppressive material is disclosed for use in a television cathode ray tube. The tube includes a funnel with a conductive coating on the inner surface thereof and a neck enclosing an electron gun having snubber springs extending from an anode electrode. The arc-suppressive material according to the invention is deposited in an area between the conductive coating and the gun and in contact with the snubber springs. The improved resistive material comprises tin oxide (SnO2) doped with an antimony compound and calcined in a semi-sealed crucible for about two hours at a temperature in the range of 1306 DEG C. to 1326 DEG C., and blended with glass frit in a weight-percent ratio range of 45-55. The doping and the temperature range and duration are effective to inbue the material with a hardness resistant to plowing by the snubber springs, and electrical resistance value effective to suppress arcing.