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Title: Pressurized heat treatment of glass ceramic

Abstract

A method of producing a glass-ceramic having a specified thermal expansion value is disclosed. The method includes the step of pressurizing the parent glass material to a predetermined pressure during heat treatment so that the glass-ceramic produced has a specified thermal expansion value. Preferably, the glass-ceramic material is isostatically pressed. A method for forming a strong glass-ceramic to metal seal is also disclosed in which the glass-ceramic is fabricated to have a thermal expansion value equal to that of the metal. The determination of the thermal expansion value of a parent glass material placed in a high-temperature environment is also used to determine the pressure in the environment.

Inventors:
Publication Date:
OSTI Identifier:
6368058
Application Number:
ON: TI85006436
Assignee:
Dept. of Energy EDB-85-038263
DOE Contract Number:
AC04-76DP00053
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; PRODUCTION; GLASS; HEAT TREATMENTS; METALS; PRESSING; PRESSURIZING; SEALS; THERMAL EXPANSION; ELEMENTS; EXPANSION; FABRICATION; MATERIALS WORKING; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Kramer, D.P.. Pressurized heat treatment of glass ceramic. United States: N. p., 1984. Web.
Kramer, D.P.. Pressurized heat treatment of glass ceramic. United States.
Kramer, D.P.. Thu . "Pressurized heat treatment of glass ceramic". United States. doi:.
@article{osti_6368058,
title = {Pressurized heat treatment of glass ceramic},
author = {Kramer, D.P.},
abstractNote = {A method of producing a glass-ceramic having a specified thermal expansion value is disclosed. The method includes the step of pressurizing the parent glass material to a predetermined pressure during heat treatment so that the glass-ceramic produced has a specified thermal expansion value. Preferably, the glass-ceramic material is isostatically pressed. A method for forming a strong glass-ceramic to metal seal is also disclosed in which the glass-ceramic is fabricated to have a thermal expansion value equal to that of the metal. The determination of the thermal expansion value of a parent glass material placed in a high-temperature environment is also used to determine the pressure in the environment.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 19 00:00:00 EST 1984},
month = {Thu Apr 19 00:00:00 EST 1984}
}
  • A method of producing a glass-ceramic having a specified thermal expansion value is disclosed. The method includes the step of pressurizing the parent glass material to a predetermined pressure during heat treatment so that the glass-ceramic produced has a specified thermal expansion value. Preferably, the glass-ceramic material is isostatically pressed. A method for forming a strong glass-ceramic to metal seal is also disclosed in which the glass-ceramic is fabricated to have a thermal expansion value equal to that of the metal. The determination of the thermal expansion value of a parent glass material placed in a high-temperature environment is alsomore » used to determine the pressure in the environment.« less
  • A method of producing a glass-ceramic having a specified thermal expansion value is disclosed. The method includes the step of pressurizing the parent glass material to a predetermined pressure during heat treatment so that the glass-ceramic produced has a specified thermal expansion value. Preferably, the glass-ceramic material is isostatically pressed. A method for forming a strong glass-ceramic to metal seal is also disclosed in which the glass-ceramic is fabricated to have a thermal expansion value equal to that of the metal. The determination of the thermal expansion value of a parent glass material placed in a high-temperature environment is alsomore » used to determine the pressure in the environment.« less
  • A method for preventing malfunctions in the solidification of radioactive wastes contained in an aqueous waste solution in a glass, glass ceramic or glass ceramic-like matrix wherein the wastes are spray-dried and calcinated is described. Diatomaceous earth or diatomaceous earth-like substances in solid form are added to the aqueous waste solution before the spray drying step in quantities of 45 to 70 g/l and in grain sizes of which more than 85 percent by weight of the grain size distribution are grain sizes from 6 to 75 ..mu...
  • This patent describes a pressurized water drive system to move a power transmission in one direction or a opposite direction, comprising: (a) two sealed sections of compact, collapsible, flat hose arranged in a line, each section having one end to be joined to an end of the other section, and each section having a second end having an orifice, and each section being arranged in up and down side by side portions for endwise compression of the hose section. The hose section under compression has water contained in the hose section drained out of the end orifice, where the othermore » section is expanded by receiving water under pressure through the other section orifice; (b) a power take off secured to the two sealed sections where they are joined together; (c) a housing within which the two sealed sections expand and contract, having an elongated opening to accommodate the transitory movement of the power take off, and having openings to provide access to the orifices on the two sealed sections; (d) a water control assembly to direct pressurized water alternately to respective orifices of the two sealed sections of one section of the flat hose and thereby expanding the flat hose, moving the power take off in one direction or in the opposite direction by expanding the other section of flat hose; and (e) a power transmission, connected to the power take off, to transmit the motion of the power take off to solar energy collectors in their tracing of the sun.« less
  • A method for producing a ceramic-glass-ceramic seal by microwaving, mixes a slurry of glass sealing material and coupling agent and applies same to ceramic workpieces. The slurry and workpieces are placed together, insulated and then microwaved at a power, time and frequency sufficient to cause a liquid phase reaction in the slurry. The reaction of the glass sealing material forms a chemically different seal than that which would be formed by conventional heating because it is formed by a diffusion rather than by wetting of the reactants.