Composite PTCR Thermistors Utilizing Conducting Borides, Silicides, and Carbide Powders

Abstract

Ceramic-polymer composite thermistors using conducting boride, silicide, and carbide powders that include TiB2, ZrB2, NbB2, NbSi2, WSi2, MoSi2, and TiC have been fabricated. Percolation and subsequent PTCR effects were observed for all the powders in both semi-crystalline (polyethylene) and amorphous (epoxy) polymer matrix materials, however, as found for carbon black and metal fillers, both niobate powders did not exhibit a PTCR effect in the amorphous polymer. Results indicate that percolation and PTCR behaviour are related to the powder characteristics (size/distribution), composite microstructure and ceramic-polymer interface. Composite thermistors with room temperature resistivities as low as 1 Ω cm and a nine-order of magnitude change (Δρ{variant}) at 1 kHz (12 Δρ{variant} at d.c.) were achieved.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0022-2461

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1991 Kluwer Academic Publishers, All rights reserved.

Publication Date

01 Jan 1991

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