Sensors with high temperature piezoelectric ceramics
US7658111B2 · kind B2 · utility
1Cited by
11References
22Claims
0Family size
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Key dates
| Filing date | Nov 16, 2007 |
| Grant date | Feb 9, 2010 |
| Priority date | — |
| Expiry date | Jan 8, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/81
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A piezoelectric sensor includes a ceramic material that has the formula of [Bi2O2][Am−1BmO3m+1], where m=2, A is mono-, di-, or tri-valent ions or a combination of them, B is transition element such as Fe3+, Ti4+, Nb5+, Ta5+, W6+, Mo6+ or a combination of them. The ceramics have high Curie temperature of 900˜940° C. The sensors claimed in the present invention utilize [Bi2O2][Am−1BmO3m+1] ceramics parts as sensing elements in various shapes and dimensions and can be used to sense force, acceleration, and pressure at very high temperatures of 600˜800° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.