GB1341368A - Treatment of barium titanate ceramics - Google Patents
Treatment of barium titanate ceramicsInfo
- Publication number
- GB1341368A GB1341368A GB2875872A GB1341368DA GB1341368A GB 1341368 A GB1341368 A GB 1341368A GB 2875872 A GB2875872 A GB 2875872A GB 1341368D A GB1341368D A GB 1341368DA GB 1341368 A GB1341368 A GB 1341368A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heating
- barium titanate
- oxidizing atmosphere
- temperature coefficient
- barium
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
- C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
- C04B35/465—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates
- C04B35/468—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
- C04B35/4682—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates based on BaTiO3 perovskite phase
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Thermistors And Varistors (AREA)
Abstract
1341368 Positive temperature coefficient resistors MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 20 June 1972 28758/72 Heading H1K The positive temperature coefficient of resistance of a barium titanate based ceramic is increased by coating it with a silver compound and/or a lithium compound, which is the oxide or is convertible to it by heating above 700 C. in an oxidizing atmosphere, and then heating in an oxidizing atmosphere at from 700-1200 C. The titanate, which includes niobium, bismuth, antimony or a rare earth element such as lanthanum to provide the positive coefficient may have its Curie point adjusted by substitution of lead and tin for part of the barium and titanium respectively. The lithium and silver compounds, examples of which are given, may be applied in the molten form, as a paste or solution, or as a powder, any excess being removed after the heating is completed. Various examples are described in details.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2875872 | 1972-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1341368A true GB1341368A (en) | 1973-12-19 |
Family
ID=10280669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2875872A Expired GB1341368A (en) | 1972-06-20 | 1972-06-20 | Treatment of barium titanate ceramics |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1341368A (en) |
-
1972
- 1972-06-20 GB GB2875872A patent/GB1341368A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PE20 | Patent expired after termination of 20 years |