ZINC OXIDE VARISTOR AND MANUFACTURE THEREOF, AND CRYSTALLIZED GLASS COMPOSITION FOR COATING

摘要

PURPOSE:To provide a high reliability zinc oxide varistor by providing a crystallized glass side high resistance layer taking PbO as a chief ingredient including a specific amount of MoO3 on the side surface of a sintered product taking zinc oxide as a chief ingredient. CONSTITUTION:There is provided on the side surface of a sintered product 1 including zinc oxide as a chief ingredient a crystallized glass side high resistance layer 3 taking PbO as a chief ingredient including molybdenum oxide of 0.1-10.0% by weight reduced in the form of MoO3. Hereby, the crystallized glass taking PbO as a chief ingredient is promoted in its crystallization with the addition of MoO3 and improved in the strength of a coated film with the addition of SiO2, an is excellent in an electrostatic breakdown characteristic because of its good contact property with a sintered product and is limited to the minimum in its deterioration of voltage nonlineality upon its being sintered because of its high insulator. Thus, an excellent charging life time characteristic, high reliability zinc oxide varistor can be provided.