Ultrasonic Evaluation of Low Density Powder Compacts
Ultrasonic evaluation of powder compacts provides valuable information about the density of the powder and incipient defects in the compact. Since the specimens would be contaminated if they were inspected with traditional immersion or contact techniques, procedures to dry couple or vacuum bag and immerse the powder samples were implemented. With these methods ultrasonic energy was propagated through the powder compacts and the acoustic velocity and attenuation were measured. The ability to immerse the powder samples not only provides consistent coupling but allows scanning which is a valuable tool to image variations and defects in the compacts.
KeywordsPowder Compact Fractional Density Acoustic Energy Acoustic Velocity Sandia National Laboratory
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- 1.J. E. Smugeresky, Sandia National Laboratories, Livermore, California 94551, personal communication.Google Scholar