Contact resistance in PTC thermistors

Author

Park, C.W. ; Cho, K.H. ; Lee, J.Y. ; Lee, H.Y.

Author_Institution

Sch. of Metall. & Mater. Eng., Yeungnam Univ., Kyongsan, South Korea

Volume

2

fYear

1996

fDate

18-21 Aug 1996

Firstpage

995

Abstract

The electrode resistance of semiconducting PTC BaTiO₃ ceramic was studied in same detail. Commercial In-Ag paste, In-Ga alloy, and electroless plated Ni as well as evaporated Al with and without Pt overcoat layer mere chosen as electrode. The contact resistance of electroded samples at or above room temperature was determined using both dc resistance and ac impedance measurements. The aging of contact resistance under cyclic loading from -10 to 85°C was also monitored for the prolonged period of time. The effect of heat treatment and protective coating on the stability of Al electrode was determined. Commercial In-Ag paste showed the excellent stability against contact resistance degradation. However, the contact resistance of Al electrode during aging was strongly dependent on the annealing condition and the presence of protective layer

Keywords

ageing; barium compounds; ceramics; contact resistance; electrodes; semiconductor materials; thermistors; -10 to 85 C; AC impedance; Al; BaTiO₃; DC resistance; In-Ag; In-Ag paste; In-Ga; In-Ga alloy; Ni; PTC thermistor; Pt; Pt overcoat layer; aging; annealing; contact resistance; cyclic loading; electrode; electroless plated Ni; evaporated Al; heat treatment; protective coating; semiconducting BaTiO₃ ceramic; stability; Aging; Aluminum alloys; Ceramics; Contact resistance; Electrodes; Nickel alloys; Protection; Semiconductivity; Stability; Thermistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on

Conference_Location

East Brunswick, NJ

Print_ISBN

0-7803-3355-1

Type

conf

DOI

10.1109/ISAF.1996.598196

Filename

598196