Nondestructive evaluation development for process control

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5231142

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 Science, Shanghai SH (China). Inst. for Ceramics
3. Allied-Signal Aerospace Co., Torrance, CA (United States). Garrett Ceramic Components Div.

A joint project between Garrett Ceramic Components (GCC) of Allied Signal Aerospace Corporation and Argonne National Laboratory (ANL) is ongoing to evaluate nondestructive characterization (NDC) methods to detect and measure process-induced variations in ceramic materials. The process methods of current focus on slip-casting and injection molding and the NDC methods being evaluated are microfocus X-ray computed tomography (XCT) and nuclear magnetic resonance computed tomography (MRCT). As part of this work, SiC whisker reinforced Si{sub 3}N{sub 4} (GCC's GN-10 material) has been pressure slip-cast at two casting pressures, 15 and 40 psi; and at length/diameter ratios of 1.5, 2.5 and 3.0 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 established. XCT has been shown to be able to detect <5% variations in as-cast density and these were destructively verified.

• 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: 5231142
• Report Number(s): ANL/CP-76077; CONF-911050-11; ON: DE92015272
• Resource Relation: Conference: Automotive technology development contractors' coordination meeting, Dearborn, MI (United States), 22-25 Oct 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CERAMICS
COMPUTERIZED TOMOGRAPHY
MOLDING
SLIP CASTING
DENSITY
FRACTURE PROPERTIES
NONDESTRUCTIVE TESTING
NUCLEAR MAGNETIC RESONANCE
PROCESS CONTROL
REINFORCED MATERIALS
SILICON CARBIDES
SILICON NITRIDES
WHISKERS
X RADIATION
CARBIDES
CARBON COMPOUNDS
CASTING
CONTROL
CRYSTALS
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
FABRICATION
IONIZING RADIATIONS
MAGNETIC RESONANCE
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
RADIATIONS
RESONANCE
SILICON COMPOUNDS
TESTING
TOMOGRAPHY
360201* - Ceramics
Cermets
&amp; Refractories- Preparation &amp; Fabrication
320303 - Energy Conservation
Consumption
&amp; Utilization- Industrial &amp; Agricultural Processes- Equipment &amp; Processes