Composite PTCR thermistors utilizing conducting borides, silicides, and carbide powders

Thomas R. Shrout, D. Moffatt, W. Huebner

Research output: Contribution to journalArticle

76 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)145-154
Number of pages10
JournalJournal of Materials Science
Volume26
Issue number1
DOIs
StatePublished - Jan 1 1991

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Boron Compounds
Silicides
Thermistors
Borides
Powders
Carbides
Polymers
Composite materials
Soot
Filler metals
Polyethylene
Carbon black
Polymer matrix
Polyethylenes
Crystalline materials
Microstructure
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Shrout, Thomas R. ; Moffatt, D. ; Huebner, W. / Composite PTCR thermistors utilizing conducting borides, silicides, and carbide powders. In: Journal of Materials Science. 1991 ; Vol. 26, No. 1. pp. 145-154.
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Composite PTCR thermistors utilizing conducting borides, silicides, and carbide powders. / Shrout, Thomas R.; Moffatt, D.; Huebner, W.

In: Journal of Materials Science, Vol. 26, No. 1, 01.01.1991, p. 145-154.

Research output: Contribution to journalArticle

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T1 - Composite PTCR thermistors utilizing conducting borides, silicides, and carbide powders

AU - Shrout, Thomas R.

AU - Moffatt, D.

AU - Huebner, W.

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N2 - 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.

AB - 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.

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