Use of volume x-ray tomography for characterizing density variations in as-cast ceramic bodies

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:6923450

Ellingson, W A; Holloway, D L; Sivers, E A ^[1]; Ling, J ^[2]; Pollinger, J P; Yeh, H C ^[3]

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1. Argonne National Lab., IL (United States)
2. Chinese Academy of Sciences, Shanghai, SH (China). Inst. for Ceramics
3. Allied-Signal Aerospace Co., Torrance, CA (United States). Garrett Ceramic Components Div.

A joint project is ongoing to evaluate nondestructive characterization (NDC) methods to detect and measure process-induced variations in ceramic materials. The process methods of current focus are slip-casting and injection molding, and a primary NDC method being evaluated is microfocus X-ray computed tomography (XCT). SiC-whisker-reinforced Si[sub 3]N[sub 4] has been pressure-slip-cast at two casting pressures, 0.103 and 0.276 MPa (15 and 40 psi); and at length/diameter ratios of 1.5, and 2.67 with whisker contents of 20, 23, 27, and 30 wt.%. Three-dimensional microfocus XCT has been used to study density variations in billets produced by different process conditions. Destructive measurement of density variation has been compared to the XCT measurements and correlations have been established. XCT has been proven (by destructive verification) to be capable of detecting <5% variations in as-cast density.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6923450
• Report Number(s): ANL/MCT/CP-77573; CONF-921110-32; ON: DE93002906
• Resource Relation: Conference: Winter annual meeting of the American Society of Mechanical Engineers (ASME), Anaheim, CA (United States), 8-13 Nov 1992
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
REINFORCED MATERIALS
NONDESTRUCTIVE TESTING
SLIP CASTING
COMPUTERIZED TOMOGRAPHY
DENSITY
INDUSTRIAL RADIOGRAPHY
SILICON CARBIDES
SILICON NITRIDES
VARIATIONS
WHISKERS
X RADIATION
CARBIDES
CARBON COMPOUNDS
CASTING
CRYSTALS
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
FABRICATION
IONIZING RADIATIONS
MATERIALS
MATERIALS TESTING
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
RADIATIONS
SILICON COMPOUNDS
TESTING
TOMOGRAPHY
360602* - Other Materials- Structure &amp; Phase Studies
420500 - Engineering- Materials Testing