skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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. Nuclearing 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 to 1700/sup 0/C and is then heat-treated at a temperature within the range of 800 to 1200/sup 0/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:
Publication Date:
OSTI Identifier:
6368052
Application Number:
ON: TI85005776
Assignee:
Dept. of Energy SNL; EDB-85-038264
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; PRECIPITATION HARDENING; GLASS; ZIRCONIUM OXIDES; HEAT TREATMENTS; TETRAGONAL LATTICES; CHALCOGENIDES; CRYSTAL LATTICES; CRYSTAL STRUCTURE; HARDENING; OXIDES; OXYGEN COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Keefer, K.D.. Glass ceramic toughened with tetragonal zirconia. United States: N. p., 1984. Web.
Keefer, K.D.. Glass ceramic toughened with tetragonal zirconia. United States.
Keefer, K.D.. Fri . "Glass ceramic toughened with tetragonal zirconia". United States.
@article{osti_6368052,
title = {Glass ceramic toughened with tetragonal zirconia},
author = {Keefer, K.D.},
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. Nuclearing 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 to 1700/sup 0/C and is then heat-treated at a temperature within the range of 800 to 1200/sup 0/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 = {1984},
month = {2}
}