Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1991-07-10
1992-04-07
Lindsay, Robert L.
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
65 3011, 65 33, 501 6, 501 8, C03C 1012
Patent
active
051028336
ABSTRACT:
Alkali metal- and alkaline earth metal-oxide aluminosilicate amorphous glass articles can be strengthened by providing such glass with a cerium dioxide sensitizer and a nucleating agent, irradiating the article with electromagnetic radiation, heating the irradiated article to a temperature between about the annealing and softening points of the glass, and cooling the heated, irradiated glass article. The treated article has a thick lower layer of the amorphous glass, but a thin layer of this glass at the surface of the article has been converted to a crystalline state. In this surface layer, some of the cerium has been converted from a +3 to a +4 ionic state and some of the metal element in the nucleating agent has been changed to a metallic state. The adjacent location of the lower and surface layers creates large compressive stresses at the surface layer which imparts great strength to the glass article.
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Pye Lenwood D.
Sehgal Jeetendra
Alfred University
Goldman Michael L.
Lindsay Robert L.
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