| 摘要 |
PROBLEM TO BE SOLVED: To provide a ceramic screw body provided with a screw part capable of reducing manufacturing cost and having excellent electric insulation property, chemical resistance, protection against corrosion, and strength. SOLUTION: A ceramic bolt 1 being the ceramic screw body is formed by heating and baking a powder-like raw material containing zirconia being a main component and yttria being a by-component after molding by pressurization to realize such a shape that a male screw part 11 is provided on at least one end side of a stem part 10. Outside diameter (d) of the stem part 10 is smaller than outside diameter D<SB>1</SB>of the male screw part 11, and pitch dimension P of the male screw part 11 is set to be larger than pitch dimension of a coarse thread. COPYRIGHT: (C)2007,JPO&INPIT
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