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Title: Method for making glass-ceramic articles exhibiting high frangibility

Abstract

This invention is concerned with glass-ceramic articles having compositions within a very narrowly-delimited area of the MgO-Al.sub.2 O.sub.3 -B.sub.2 O.sub.3 -SiO.sub.2 field and having alpha-quartz and sapphirine as the principal crystal phases, resulting from nucleation through a combination of TiO.sub.2 and ZrO.sub.2. Upon contacting such articles with lithium ions at an elevated temperature, said lithium ions will replace magnesium ions on a two Li.sup.+-for-one Mg.sup..sup.+2 basis within the crystal structures, thereby providing a unitary glass-ceramic article having an integral surface layer wherein the principal crystal phase is a lithium-stuffed beta-quartz solid solution. That transformation of crystal phases results in compressive stresses being set up within the surface layer as the articles are cooled. Through the careful control of composition, crystallization treatment, and the parameters of the replacement reaction in the crystal structures, a tremendous degree of stored elastic energy can be developed within the articles such that they will demonstrate frangibility when fractured but will not exhibit undesirable spontaneous breakage and/or spalling.

Inventors:
 [1];  [2];  [3];  [4]
  1. Big Flats, NY
  2. (Corning, NY)
  3. Corning, NY
  4. Horseheads, NY
Issue Date:
OSTI Identifier:
862459
Patent Number(s):
3936287
Application Number:
05/437,008
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
C - CHEMISTRY C03 - GLASS C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; glass-ceramic; articles; exhibiting; frangibility; concerned; compositions; narrowly-delimited; mgo-al; -b; -sio; field; alpha-quartz; sapphirine; principal; crystal; phases; resulting; nucleation; combination; zro; contacting; lithium; elevated; temperature; replace; magnesium; -for-one; mg; basis; structures; providing; unitary; article; integral; surface; layer; phase; lithium-stuffed; beta-quartz; solid; solution; transformation; results; compressive; stresses; set; cooled; careful; control; composition; crystallization; treatment; parameters; replacement; reaction; tremendous; degree; stored; elastic; energy; developed; demonstrate; fractured; exhibit; undesirable; spontaneous; breakage; spalling; ceramic article; elevated temperature; surface layer; crystal structure; solid solution; ceramic articles; compressive stress; principal crystal; compressive stresses; glass-ceramic articles; crystal phase; /65/

Citation Formats

Beall, George H, Brydges, III., William T., Ference, Joseph, and Kozlowski, Theodore R. Method for making glass-ceramic articles exhibiting high frangibility. United States: N. p., 1976. Web.
Beall, George H, Brydges, III., William T., Ference, Joseph, & Kozlowski, Theodore R. Method for making glass-ceramic articles exhibiting high frangibility. United States.
Beall, George H, Brydges, III., William T., Ference, Joseph, and Kozlowski, Theodore R. Tue . "Method for making glass-ceramic articles exhibiting high frangibility". United States. https://www.osti.gov/servlets/purl/862459.
@article{osti_862459,
title = {Method for making glass-ceramic articles exhibiting high frangibility},
author = {Beall, George H and Brydges, III., William T. and Ference, Joseph and Kozlowski, Theodore R},
abstractNote = {This invention is concerned with glass-ceramic articles having compositions within a very narrowly-delimited area of the MgO-Al.sub.2 O.sub.3 -B.sub.2 O.sub.3 -SiO.sub.2 field and having alpha-quartz and sapphirine as the principal crystal phases, resulting from nucleation through a combination of TiO.sub.2 and ZrO.sub.2. Upon contacting such articles with lithium ions at an elevated temperature, said lithium ions will replace magnesium ions on a two Li.sup.+-for-one Mg.sup..sup.+2 basis within the crystal structures, thereby providing a unitary glass-ceramic article having an integral surface layer wherein the principal crystal phase is a lithium-stuffed beta-quartz solid solution. That transformation of crystal phases results in compressive stresses being set up within the surface layer as the articles are cooled. Through the careful control of composition, crystallization treatment, and the parameters of the replacement reaction in the crystal structures, a tremendous degree of stored elastic energy can be developed within the articles such that they will demonstrate frangibility when fractured but will not exhibit undesirable spontaneous breakage and/or spalling.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {2}
}

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