Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1998-03-05
2000-08-15
Gellner, Michael L.
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338225D, 338 25, H01L 710
Patent
active
061042749
ABSTRACT:
A composite PTC material made of cristobalite as a matrix and a conductive filler, having a room temperature resistivity of 10.sup.-1 .OMEGA.cm or less. The conductive filler is at least one substance selected from the group consisting of single metals, metal silicides, metal carbides and metal borides; has a room temperature resistivity of 10.sup.-3 .OMEGA.cm or less when per se made into a sintered material; has particle diameters of 2-50 .mu.m; and is contained in a proportion of 20-35% by volume of the composite PTC material. The composite PTC material has a relative density of 90% or more after firing.
REFERENCES:
patent: 5378407 (1995-01-01), Chandler et al.
"Positive-Temperature-Coefficient Effect in Conductive-Ceramic/High-Expensive-Ceramic Composites", T. Ota et al.; Journal of Materials Science Letters; Feb. 1, 1987, Chapman & Hall, UK, vol. 16, Nr. 3, pp. 239-240; ISSN 0261-8028 XP002069076.
"Preparation of Graphite/Critstobalite/Silicone Rubber PTC Composites", T. Harada et al,; Dec. 1996, Journal of the Ceramic Society of Japan; International Edition, vol. 104, Nr. 12, pp. 1144-1147, XP000656945.
"Positive Temperature Coefficient of Resistance Effect in Hot-pressed Cristobalite-Silicon Carbide Composites"; Du Wei-Fang et al.; Journal of Materials Science; Feb. 15, 1994, UK, vol. 29, Nr. 4, pp. 1097-1100, ISSN 0022-2461, XP002069077.
"PTC Effect of a Composite of Conductive Ceramic--Ceramic Having High Thermal Expansion"; Ultramodern Technology Highlight; May 1, 1993; vol. 116.
"PTC Effect of Composite of Conductive Ceramic--Ceramic Having High Thermal Expansion"; Annual Report by Ceramic Research Institutions (1991); vol. 1, 57-60.
"Composition PTC Materials"; Annual Report by Ceramic Research Institutions (1995); vol. 5, 13-19.
"PTC Effect and Its Mechanism in a Novel Thermistor Material--Hot-Pressed SiC/SiC.sub.2 Multiphase Ceramic"; Institute of Materials Science and Application Chemistry, Hunan University; Nov. 4, 1993.
"Positive-Temperature-Coefficient Effect in Graphite-Cristobalite Composites", Ceramics Research Laboratory, Nagoya Institute of Technology; Junichi Takahasi; Jul. 1992.
"Positive Temperature Coefficient of Resistance Effect in Hot-Pressed Cristobalite-Silicon Carbide Composites"; Du Wei-Fang et al.; Institute of Materials Science and Application Chemistry, University of Hunan; 1994.
Araki Kiyoshi
Matsuda Kazuyuki
Shibata Junko
Gellner Michael L.
Lee Richard K.
NGK Insulators Ltd.
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