Accession Number:

ADA224730

Title:

On-Line Quantitative Nondestructive Evaluation and Characterization of Tough Ceramics at Operating Temperatures (DURIP)

Descriptive Note:

Final rept. 1 Dec 1988-31 May 1990

Corporate Author:

TEXAS A AND M RESEARCH FOUNDATION COLLEGE STATION

Personal Author(s):

Report Date:

1990-06-25

Pagination or Media Count:

7.0

Abstract:

A grant of 70,000 from AFOSR was used to buy a 600W CO2 laser. This was combined with items bought with supplemental funds from other sources to assemble a facility for characterization of ceramic materials at extremely high temperatures up to 2000C is anticipated in air. The system splits the laser beam into two equal components each of which is coupled into its own computer controlled galvanometric scanner that scans the beam rapidly over a central portion of the front or back surface of a flat specimen. The scan rate and scan density is controlled to yield a test volume, in the mid-section of the specimen, that is at uniform temperature and free of thermal stresses. Related research is developing non-contact methods for stain measurements and damage detection within the central volume of material that is at the test temperature. Characterization of material properties and behavior in a wide range of severe environments will be possible with this system. Keywords Tough ceramics, Non-destructive evaluation, High temperature.

Subject Categories:

  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE