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Ultrasonic velocity for estimating density of structural ceramicsThe feasibility of using ultrasonic velocity as a measure of bulk density of sintered alpha silicon carbide was investigated. The material studied was either in the as-sintered condition or hot isostatically pressed in the temperature range from 1850 to 2050 C. Densities varied from approximately 2.8 to 3.2 g cu cm. Results show that the bulk, nominal density of structural grade silicon carbide articles can be estimated from ultrasonic velocity measurements to within 1 percent using 20 MHz longitudinal waves and a commercially available ultrasonic time intervalometer. The ultrasonic velocity measurement technique shows promise for screening out material with unacceptably low density levels.
Document ID
19820006486
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Klima, S. J. (NASA Lewis Research Center Cleveland, OH, United States)
Watson, G. K. (NASA Lewis Research Center Cleveland, OH, United States)
Herbell, T. P. (NASA Lewis Research Center Cleveland, OH, United States)
Moore, T. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1981
Subject Category
Nonmetallic Materials
Report/Patent Number
DOE/NASA/51040-35
NASA-TM-82765
E-1026-5
Meeting Information
Meeting: Automotive Technol. Develop. Contractor Coord. Meeting
Location: Dearborn, MI
Country: United States
Start Date: October 26, 1981
End Date: October 29, 1981
Accession Number
82N14359
Funding Number(s)
CONTRACT_GRANT: DE-AI01-77CS-51040
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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