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Strengthened glass articles, edge-strengthened laminated glass articles, and methods for making the same

  • US 10,202,300 B2
  • Filed: 08/21/2014
  • Issued: 02/12/2019
  • Est. Priority Date: 08/23/2013
  • Status: Active Grant
First Claim
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1. A method of manufacturing a laminated glass article comprising at least one glass cladding layer and a glass core layer adhered to the at least one glass cladding layer, the method comprising:

  • removing a portion of the laminated glass article such that an exposed surface of the glass core layer is exposed on at least one edge of the laminated glass article;

    conducting an ion exchange at the exposed surface of the glass core layer to introduce Li+ or Na+ ions to the exposed surface of the glass core layer, the ion exchange comprising contacting the exposed surface of the glass core layer with a molten salt bath comprising one or more additives selected from the group consisting of carbonates, bicarbonates, hydroxides, fluorides, and phosphates; and

    crystallizing a portion of the glass core layer at the exposed surface to form a crystallized or semi-crystallized surface of the glass core layer, the portion of the glass core layer having a lower coefficient of thermal expansion (CTE) than a remainder of the glass core layer, wherein the crystallizing step comprises heat treating at least the exposed surface of the glass core layer, the heat treating comprising;

    heating at least the exposed surface of the glass core layer to a nucleation temperature in a range of from about 500°

    C. to about 850°

    C.;

    cooling at least the exposed surface of the glass core layer to a temperature below about 500°

    C.; and

    reheating at least the exposed surface of the glass core layer to a crystallization temperature in a range of from about 500°

    C. to about 850°

    C., where the crystallization temperature is at least about 5 degrees higher than the nucleation temperature.

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