GB1479004A - Ptc thermistor compositions - Google Patents
Ptc thermistor compositionsInfo
- Publication number
- GB1479004A GB1479004A GB2633474A GB2633474A GB1479004A GB 1479004 A GB1479004 A GB 1479004A GB 2633474 A GB2633474 A GB 2633474A GB 2633474 A GB2633474 A GB 2633474A GB 1479004 A GB1479004 A GB 1479004A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- mol per
- mol
- substituted
- resistor composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000203 mixture Substances 0.000 title abstract 3
- 229910004298 SiO 2 Inorganic materials 0.000 abstract 1
- 229910010413 TiO 2 Inorganic materials 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
- H01C7/022—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances
- H01C7/023—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances containing oxides or oxidic compounds, e.g. ferrites
- H01C7/025—Perovskites, e.g. titanates
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Thermistors And Varistors (AREA)
Abstract
1479004 Resistor composition MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 13 June 1974 26334/74 Heading ClJ [Also in Division H1] A PTC resistor composition is made by mixing 1 mol BaTiO 3 , in which up to 35 atom per cent of the Ba may be substituted by Sr, up to 25% by Pb, and up to 20% of the Ti substituted by Sn, with 0À08-0À15 mol per cent of Nb 2 O 5 and 0À05-0À1 mol per cent of MnO 2 . The substituent atoms vary the temperature at which a rapid increase in the coefficient occurs and the optional addition of 0À5-3 mol per cent SiO 2 and up to 2 mol per cent TiO 2 reduce the voltage dependence and increase the temperature coefficient respectively. In manufacture the component oxides or oxide yielding compounds are blended, calcined, ground, pressed into disc form, fired at 1250-1400‹ C. for ¢-5 hours in air, and cooled at less than 200‹ C. per hour to 400‹ C., and ohmic contacts provided on the disc surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2633474A GB1479004A (en) | 1974-06-13 | 1974-06-13 | Ptc thermistor compositions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2633474A GB1479004A (en) | 1974-06-13 | 1974-06-13 | Ptc thermistor compositions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1479004A true GB1479004A (en) | 1977-07-06 |
Family
ID=10242039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2633474A Expired GB1479004A (en) | 1974-06-13 | 1974-06-13 | Ptc thermistor compositions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1479004A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280846A (en) | 1978-08-01 | 1981-07-28 | Thomson-Csf | Method of fabrication of dielectric material having volume-distributed insulating barriers for use at high voltages and a ceramic body fabricated by said method |
| US4890494A (en) * | 1983-10-08 | 1990-01-02 | Plessey Overseas Limited | Atmospheric sensor |
| EP0629102A2 (en) * | 1993-06-08 | 1994-12-14 | OHIZUMI Mfg. Co., Ltd. | Exothermic device for different electric sources |
-
1974
- 1974-06-13 GB GB2633474A patent/GB1479004A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280846A (en) | 1978-08-01 | 1981-07-28 | Thomson-Csf | Method of fabrication of dielectric material having volume-distributed insulating barriers for use at high voltages and a ceramic body fabricated by said method |
| US4890494A (en) * | 1983-10-08 | 1990-01-02 | Plessey Overseas Limited | Atmospheric sensor |
| EP0629102A2 (en) * | 1993-06-08 | 1994-12-14 | OHIZUMI Mfg. Co., Ltd. | Exothermic device for different electric sources |
| EP0629102A3 (en) * | 1993-06-08 | 1995-02-01 | Ohizumi Mfg Co Ltd | Exothermic device for different electric sources. |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19940612 |