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Jeetendra L Sehgal

from Alfred, NY

Also known as:
  • Lal Sehgal Jeetendra

Jeetendra Sehgal Phones & Addresses

  • Alfred, NY
  • Almond, NY

Us Patents

  • Strengthening Glass Articles With Electromagnetic Radiation And Resulting Product

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  • US Patent:
    51028336, Apr 7, 1992
  • Filed:
    Jul 10, 1991
  • Appl. No.:
    7/727883
  • Inventors:
    Jeetendra Sehgal - Alfred NY
    Lenwood D. Pye - Alfred NY
  • Assignee:
    Alfred University - Alfred NY
  • International Classification:
    C03C 1012
  • US Classification:
    501 4
  • 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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