| 摘要 |
PROBLEM TO BE SOLVED: To reduce weight and improve high-temperature insulating characteristic, without increasing the number of turns or the thickness by setting the substantial average thickness of mica flakes constituting a laminated mica part to a specified value or less. SOLUTION: As mica flakes 3 constituting a laminated mica part 2, those crushed by a crusher capable of remarkably finely crushing natural mica or synthetic mica with a substantial average particle size of 45-170μm are used. The substantial average thickness of the mica flakes 3 is set to 2μm (0.1-2μm) or less. Since the high-temperature insulating characteristic is sharply improved according to this, the number of turns onto a conductor circumference can be minimized. Thus, the outer diameter of the resulting fire resisting wire can be minimized to reduce the weight, and the manufacturing cost can be also reduced. Furthermore, the airtightness of the reconstituted mica part 2 is improved, so that the penetration of a cracked gas causing reduction in insulation in a high-temperature insulation test can be strongly prevented.
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