UNSPECIFIED (1998) Non-destructive evaluation of green-state ceramics using micromachined air-coupled capacitance transducers. In: 17th Ultrasonics International Conference (UI 97), TECH UNIV DELFT, DELFT, NETHERLANDS, JUL 02-04, 1997. Published in: ULTRASONICS, 36 (1-5). pp. 121-126. ISSN 0041-624X.

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Abstract

Air-coupled ultrasound has been used to study the manufacture of ceramic components by both slip casting and injection moulding. A capacitance transducer, designed to operate at high temperatures, was used as both a source and receiver with a 500 kHz bandwidth to pass ultrasound through 3 mm thick green-state injection-moulded and slip-cast samples of silicon nitride. The transducers were C-scanned over the entire area of the sample in order to locate density changes which could lead to problems in the firing stage. Additionally: through-transmitted waveforms at 150 degrees C were obtained, indicating that the technique may be useful for performing measurements at high temperatures. (C) 1998 Elsevier Science B.V.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) R Medicine
Journal or Publication Title:	ULTRASONICS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0041-624X
Official Date:	February 1998
Dates:	Date Event February 1998 UNSPECIFIED
Volume:	36
Number:	1-5
Number of Pages:	6
Page Range:	pp. 121-126
Publication Status:	Published
Title of Event:	17th Ultrasonics International Conference (UI 97)
Location of Event:	TECH UNIV DELFT, DELFT, NETHERLANDS
Date(s) of Event:	JUL 02-04, 1997

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