Polariscopic Characterization of Sapphire and Spinel.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS
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Research on new materials demands sophisticated concurrent characterization not only to optimize fabrication parameters, but also to insure future quality control. The use of polarized light in a modified polariscope has been used to characterize transparent ingots of sapphire Al2O3 and spinel MgAl2O4. Since sapphire is birefringent, the spatial distribution of grain boundaries is easily monitored and can be related to the processing parameters several examples of cracked and uncracked sapphire disks are presented. Further, the use of the polariscope is also valuable for the characterization of cubic materials like spinel. Grain boundaries cannot be observed as with sapphire, but the distribution of strain birefringence in the ingots provides useful processing modification data. Author
- Test Facilities, Equipment and Methods