Coating material for inner coat of cathode-ray tube
AssigneeHitachi Powdered Metals Co., Ltd.
InventorHiroshi Shimbori
Life of this patent
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Abstract
Disclosed is a coating material for forming an electrically conductive inner coat. The coating material contains graphite particles, filler particles, an aqueous medium a dispersant and water-glass. The filler particle has a core and a membrane which covers the core. The core is composed of metallic oxide or metallic carbide, and the membrane is composed of alumina and silica, in which the ratio of the amount of the alumina to the amount of the membrane is within a range of 20 to 60% by weight. If the core is iron oxide, the used filler particles have at least 4% by weight of the membrane which contains 20 to 90% by weight of alumina and silica.
Claims18
A coating material, comprising:
- graphite particles;
- filler particles, each of the filler particles comprising a core and a membrane which covers the core, the core comprising a component which is selected from the group consisting of metallic oxide compounds and metallic carbide compounds, and the membrane comprising a mixture of alumina and silica, in which the amount of the alumina is within a range of 20 to 60% by weight of the total weight of the membrane;
- an aqueous medium in which the graphite particles and filler particles are dispersed;
- a dispersively effective amount of a dispersant;
- and
- water-glass for imparting adhesion to the coating material.
A coating material, comprising:
- graphite particles;
- filler particles, each of the filler particles comprising a core and a membrane which covers the core, the core comprising iron oxide, and the membrane comprising a mixture of alumina and silica, in which the amount of the membrane in the filler particle is at least 4% by weight and the amount of the alumina is within a range of 20 to 90% by weight of the total weight of the membrane;
- an aqueous medium in which the graphite particles and filler particles are dispersed;
- a dispersively effective amount of a dispersant;
- and
- water-glass for imparting adhesion to the coating material.
Dependencies are inferred from the claim text.