Wide-range thermistor material and method for producing it
US6143207A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | May 18, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/96
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided are wide-range thermistor materials with high responsibility, which have linear resistance temperature characteristics and a large rate of temperature-dependent resistance change in wide temperature range of from lower than room temperature to higher than 1000.degree. C. The thermistor material comprises an electrically-insulating ceramic matrix and second phase grains as discontinuously dispersed in the matrix, in which the second phase grains are of a semiconductive or conductive substance having a large rate of temperature-dependent resistance chance. The material may optionally contain a resistance-controlling additive of one or more of nitrides, borides, silicides, sulfides, oxides and carbide of elements, third phase grains with internal stress-relaxing ability having a lower modulus of elasticity than the matrix and the second phase grains, and a resistance stabilizer of TiO.sub.2 and/or Ti.sub.n O.sub.2n-1 (n=4 to 9).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.