GB540844A - Resistance materials and methods of making the same - Google Patents
Resistance materials and methods of making the sameInfo
- Publication number
- GB540844A GB540844A GB10706/40A GB1070640A GB540844A GB 540844 A GB540844 A GB 540844A GB 10706/40 A GB10706/40 A GB 10706/40A GB 1070640 A GB1070640 A GB 1070640A GB 540844 A GB540844 A GB 540844A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- oxides
- per cent
- range
- manganese
- 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
-
- 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
- H01C7/04—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 negative temperature coefficient
- H01C7/042—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 negative temperature coefficient mainly consisting of inorganic non-metallic substances
- H01C7/043—Oxides or oxidic compounds
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Non-Adjustable Resistors (AREA)
Abstract
540,844. Resistances. STANDARD TELEPHONES & CABLES, Ltd. June 21, 1940, No. 10706. Convention date, June 23, 1939. [Class 37] An electric resistance material having a negative temperature coefficient comprises the combined oxides of nickel, manganese, and cobalt, the resulting specific resistance varying between 1000 and 2x10<6> ohms/cm' depending on the relative proportions of the metals present. The halftemperatures (i.e. the temperature-range over which the resistance is doubled or halved) is below 70C throughout the above resistance-range and being in most cases within the limits of 140 and 20C, the range of measurement being taken as 0-25C. The Specification includes triangular curves showing lines of equal specific resistance and lines of equal half-temperature for all possible percentages of the oxides and the metals, so that, for a given specific resistance and halftemperature the percentage or percentages of each oxide or its metal element can be ascertained, and vice versa. Many numerical examples are given from these curves, Fig. 4-7 (not shown), and it is pointed out that high values of specific resistance are obtained for high nickel, manganese, or cobalt, and that half-temperatures of 30C or over are obtainable for low manganese (5-18 per cent) combined with relatively low nickel (4-30 per cent) and giving a wide resistance range. If the ratio of manganese to nickel varies between 1:1 and 12:1 a wide resistance-range is obtained with half-temperatures between 14 and 20 C. In manufacturing the resistances, the oxides in finely-divided state are intimately mixed and formed into bodies which are heated at temperatures of 800-1450C (the higher temperatures giving the lower resistance values) in an oxidizing, reducing, or inert atmosphere depending on the amount of oxide present and the resistance desired, the heat-treatment having no marked effect upon the half-temperature of the product. The bead of Fig. 1 is made by mixing the oxides into a paste with a binder such as a nitrate solution of one of the metals, for example, of cobalt, allowance for which is made in choosing the proportions of oxide. The head 10 is formed on platinum wires, dried and heat treated. In the disc of Fig. 2, the mixed oxides are pressed into a body 20 and heat treated, metal paste applied and leads 22 embedded therein. The unit is then heated to solidify the paste into electrodes 21 securing the leads. Alternatively the leads may be soldered to metal sprayed on to the solidified paste. The units may be enclosed in glass envelopes preferably evacuated to 10<-3> m.m. of mercury. A small bead of 0.03 in the diameter having a resistance 30,000 ohms at 25C and a half temperature of 18C. comprises 23 per cent NiO, 47 per cent Mn2O4, and 30 per cent Co2O3.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US280692A US2274592A (en) | 1939-06-23 | 1939-06-23 | Resistance material and method of making the same |
Publications (1)
Publication Number | Publication Date |
---|---|
GB540844A true GB540844A (en) | 1941-10-31 |
Family
ID=23074193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10706/40A Expired GB540844A (en) | 1939-06-23 | 1940-06-21 | Resistance materials and methods of making the same |
Country Status (3)
Country | Link |
---|---|
US (1) | US2274592A (en) |
FR (1) | FR867097A (en) |
GB (1) | GB540844A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2645700A (en) * | 1949-08-27 | 1953-07-14 | Bell Telephone Labor Inc | Semiconductor of mixed nickel, manganese, and iron oxides |
US2694050A (en) * | 1949-09-01 | 1954-11-09 | Bell Telephone Labor Inc | Thermally sensitive resistor |
US2626445A (en) * | 1950-06-07 | 1953-01-27 | Steatite Res Corp | Heavy-metal oxide resistors and process of making same |
DE1040660B (en) * | 1952-09-22 | 1958-10-09 | Siemens Ag | Thermistor with high temperature coefficient |
US4160227A (en) * | 1977-03-18 | 1979-07-03 | Hitachi, Ltd. | Thermistor composition and thick film thermistor |
US5675212A (en) * | 1992-04-10 | 1997-10-07 | Candescent Technologies Corporation | Spacer structures for use in flat panel displays and methods for forming same |
-
1939
- 1939-06-23 US US280692A patent/US2274592A/en not_active Expired - Lifetime
-
1940
- 1940-06-21 GB GB10706/40A patent/GB540844A/en not_active Expired
- 1940-09-10 FR FR867097D patent/FR867097A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR867097A (en) | 1941-09-26 |
US2274592A (en) | 1942-02-24 |
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