Ceramic delay lines for hot ultrasonic examination
US4907455A · kind A · utility
1Cited by
8References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | May 25, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N29/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic transducer arrangement for inspecting a work piece at an elevated temperature through the use of ceramic delay lines is disclosed. The ceramic material utilized for the delay lines is comprised of a composition of silicon nitride and boron nitride which is hot pressed so that the boron nitride platelets are aligned substantially parallel to the propagation direction of the ultrasonic pulses thus minimizing pulse attenuation. The ceramic material is heat and wear resistant and can be machined so as to conform to the surface of the work piece being inspected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.