Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1992-05-07
1994-10-25
Walsh, Donald P.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
428546, 428548, 428551, 428552, 428553, 428554, 252512, 252514, 338 22SD, 338 22R, 264104, B22F 704
Patent
active
053587936
ABSTRACT:
A PTC device has two electrodes affixed to opposed surfaces. The electrodes consist of a metal foil having a conductive layer on their surfaces that contact the PTC material. The conductive layer has a thermal coefficient of expansion intermediate between the thermal coefficients of expansion of the metal foil and the PTC material. The intermediate value of the thermal coefficient of expansion of the conductive layer prevents peeling of the electrodes off the PTC element due to the variation of the temperature of the PTC device resulting from repeated voltage applications. In addition, improved adhesion of the electrodes to the PTC material reduces resistance changes after repeated temperature cycling.
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Hanada Toshiyuki
Harazaki Kazuhiko
Morooka Isao
Takata Mayumi
Yamazaki Naoki
Daito Communication Apparatus Co. Ltd.
Greaves John N.
Kohli Vineet
Morrison Thomas R.
Walsh Donald P.
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