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

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

doi:10.1007/BF00576045

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

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

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

79 Scopus citations

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 (Δ_ρ{variant}) at 1 kHz (12 Δ_ρ{variant} at d.c.) were achieved.

Original language	English (US)
Pages (from-to)	145-154
Number of pages	10
Journal	Journal of Materials Science
Volume	26
Issue number	1
DOIs	https://doi.org/10.1007/BF00576045
State	Published - Jan 1 1991

All Science Journal Classification (ASJC) codes

General Materials Science
Mechanics of Materials
Mechanical Engineering

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title = "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.",

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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.

PY - 1991/1/1

Y1 - 1991/1/1

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

Abstract

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