Ceramic delay lines for hot ultrasonic examination

Details Ceramic delay lines for hot ultrasonic examination Ceramic delay lines for hot ultrasonic examination

1988-05-25

1990-03-13

Chapman, John

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

049074555

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.

REFERENCES:
patent: 2467301 (1949-04-01), Firestone
patent: 2697936 (1954-12-01), Farrow
patent: 3550435 (1970-12-01), Kaule
patent: 3747398 (1973-07-01), Rathburn et al.
patent: 4182155 (1980-01-01), Fowler
patent: 4437332 (1984-03-01), Pittaro
patent: 4559827 (1985-12-01), Kupperman et al.
patent: 4783997 (1988-11-01), Lynnworth
MACOR.TM., Corning Glass Works, Corning, N.Y. 14830, Apr. 1978.

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