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Title: Glass ceramic toughened with tetragonal zirconia

Abstract

A phase transformation-toughened glass ceramic and a process for making it are disclosed. A mixture of particulate network-forming oxide, network-modifying oxide, and zirconium oxide is heated to yield a homogeneous melt, and this melt is then heat-treated to precipitate an appreciable quantity of tetragonal zirconia, which is retained at ambient temperature to form a phase transformation-toughened glass ceramic. Nucleating agents and stabilizing agents may be added to the mixture to facilitate processing and improve the ceramic's properties. Preferably, the mixture is first melted at a temperature from 1200.degree. to 1700.degree. C. and is then heat-treated at a temperature within the range of 800.degree. to 1200.degree. C. in order to precipitate tetragonal ZrO.sub.2. The composition, as well as the length and temperature of the heat-treatment, must be carefully controlled to prevent solution of the precipitated tetragonal zirconia and subsequent conversion to the monoclinic phase.

Inventors:
 [1];  [2]
  1. Albuquerque, NM
  2. Sandia Park, NM
Issue Date:
Research Org.:
AT&T
OSTI Identifier:
865843
Patent Number(s):
4587224
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
C - CHEMISTRY C03 - GLASS C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
glass; ceramic; toughened; tetragonal; zirconia; phase; transformation-toughened; process; disclosed; mixture; particulate; network-forming; oxide; network-modifying; zirconium; heated; yield; homogeneous; melt; heat-treated; precipitate; appreciable; quantity; retained; ambient; temperature; form; nucleating; agents; stabilizing; added; facilitate; processing; improve; properties; preferably; melted; 1200; degree; 1700; range; 800; zro; composition; length; heat-treatment; carefully; controlled; prevent; solution; precipitated; subsequent; conversion; monoclinic; phase transformation; carefully controlled; glass ceramic; ambient temperature; zirconium oxide; stabilizing agent; nucleating agents; monoclinic phase; homogeneous melt; tetragonal zro; nucleating agent; /501/

Citation Formats

Keefer, Keith D, and Michalske, Terry A. Glass ceramic toughened with tetragonal zirconia. United States: N. p., 1986. Web.
Keefer, Keith D, & Michalske, Terry A. Glass ceramic toughened with tetragonal zirconia. United States.
Keefer, Keith D, and Michalske, Terry A. Wed . "Glass ceramic toughened with tetragonal zirconia". United States. https://www.osti.gov/servlets/purl/865843.
@article{osti_865843,
title = {Glass ceramic toughened with tetragonal zirconia},
author = {Keefer, Keith D and Michalske, Terry A},
abstractNote = {A phase transformation-toughened glass ceramic and a process for making it are disclosed. A mixture of particulate network-forming oxide, network-modifying oxide, and zirconium oxide is heated to yield a homogeneous melt, and this melt is then heat-treated to precipitate an appreciable quantity of tetragonal zirconia, which is retained at ambient temperature to form a phase transformation-toughened glass ceramic. Nucleating agents and stabilizing agents may be added to the mixture to facilitate processing and improve the ceramic's properties. Preferably, the mixture is first melted at a temperature from 1200.degree. to 1700.degree. C. and is then heat-treated at a temperature within the range of 800.degree. to 1200.degree. C. in order to precipitate tetragonal ZrO.sub.2. The composition, as well as the length and temperature of the heat-treatment, must be carefully controlled to prevent solution of the precipitated tetragonal zirconia and subsequent conversion to the monoclinic phase.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

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