Method for producing ultra-high purity, optical quality, glass articles

  • US 4,961,767 A
  • Filed: 06/29/1989
  • Issued: 10/09/1990
  • Est. Priority Date: 05/20/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for consolidating a green body comprising the steps of:

  • (a) drying and partially sintering the green body in a chamber by;

    (i) raising the temperature of the chamber to above about 1000°

    C.; and

    (ii) introducing chlorine into the chamber during at least a portion of said drying and partial sintering to reduce the level of bound water associated with the green body;

    (b) fully sintering the green body in a chamber by raising the temperature of the chamber to a temperature above about 1720°

    C. while applying a vacuum to the chamber; and

    (c) hot isostatic pressing the fully sintered green body in a chamber by raising the temperature of the chamber to above about 1150°

    C. and introducing an inert gas into the chamber at a pressure above about 100 psig.

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