NDLI: Volumetric X-Ray Imaging for Ceramic Microturbine Rotors

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ellingson, W. A. Koehl, E. R. Stainbrook, J. Rivers, M.
Copyright Year	2002
Abstract	Use of ceramic components in the hot section of gas-fired microturbines would allow higher operating temperatures and thus better operating efficiencies. However, the cost of such ceramic components is an issue for commercial-scale production. Costs can be reduced, in part, through improving fabrication yields. Use of nondestructive evaluation (NDE) methods in early stages of fabrication will support the development process to improve yields and subsequently reduce costs by rejecting flawed components prior to final processing and proof testing. An NDE approach using high-speed 3D X-ray tomographic imaging has been investigated. A large (40 × 40 cm), flat-panel, amorphous silicon X-ray detector, together with fast image processing, has been shown to allow full-volume X-ray imaging with detection of internal features in full-size as-cast parts. Gelcast radial-flow microturbine rotors, ≈23 cm in diameter, have been studied for internal defects with this 3D X-ray imaging method. Internal cracks, voids, and other variations in density within the rotors have been detected. Data acquisition speeds of 3 full frames per second have been achieved with reconstruction times of individual cross-sections of less than 1 second. This paper presents details of the 3D X-ray imaging method and results achieved on full-size microturbine rotors.
Sponsorship	International Gas Turbine Institute
Starting Page	1081
Ending Page	1085
Page Count	5
File Format	PDF
ISBN	0791836061
DOI	10.1115/GT2002-30549
e-ISBN	0791836010
Volume Number	Volume 1: Turbo Expo 2002
Conference Proceedings	ASME Turbo Expo 2002: Power for Land, Sea, and Air
Language	English
Publisher Date	2002-06-03
Publisher Place	Amsterdam, The Netherlands
Access Restriction	Subscribed
Subject Keyword	Image processing Data acquisition Rotors X-rays Radial flow Ceramics Fracture (materials) Density X-ray imaging Nondestructive evaluation Cross section (physics) Imaging Industrial ceramics Silicon Manufacturing Sensors Microturbines Operating temperature Testing
Content Type	Text
Resource Type	Article

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