Publication Date:
2019-07-13
Description:
The 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.
Keywords:
NONMETALLIC MATERIALS
Type:
NASA-TM-82765
,
DOE/NASA/51040-35
,
E-1026-5
,
Automotive Technol. Develop. Contractor Coord. Meeting; Oct 26, 1981 - Oct 29, 1981; Dearborn, MI; United States
Format:
application/pdf
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