Strengthening Sapphire by Compressive Surface Layers
作者:
H. P. Kirchner,
R. M. Gruver,
R. E. Walker,
期刊:
Journal of Applied Physics
(AIP Available online 1969)
卷期:
Volume 40,
issue 9
页码: 3445-3452
ISSN:0021-8979
年代: 1969
DOI:10.1063/1.1658217
出版商: AIP
数据来源: AIP
摘要:
Compressive surface layers were formed on sapphire rods. The methods included glazing and quenching, formation of Al2O3&sngbnd;Cr2O3solid solution surface layers, and formation of mullite and calcium aluminate surface layers. The presence of the compressive stresses was demonstrated by slotted rod tests. Substantial improvements in flexural strength and thermal shock resistance were observed. The highest average flexural strength was obtained by glazing and quenching and was 340 000 psi. The strengths were measured in the ``as‐treated'' and ``as‐treated and abraded'' conditions. The abraded samples retain a substantial portion of the improved strength.
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