Image icon  Glass ceramic, heat treated at 900°C for 3 hours

 
Use this resource: Use this resource icon
Link to this page: http://core.materials.ac.uk/search/detail.php?id=1202
Download file: http://core.materials.ac.uk/repository/doitpoms/miclib/000164.jpg
Attribution text: By DoITPoMS, Dr K M Knowles, released under CC BY-NC-SA 2.0 license
Attribution HTML: By DoITPoMS, Dr K M Knowles, released under <a href="http://creativecommons.org/licenses/by-nc-sa/2.0/uk/legalcode">CC BY-NC-SA 2.0</a> license via <a href="http://core.materials.ac.uk/search/detail.php?id=1202">CORE-Materials</a>
View at:        
Resource type: Image
Description: Glass ceramics are materials that are cooled from the melt in the form of a glass, and then heat treated to induce controlled crystallisation of the glass. Heterogeneous nucleation is carried out at a temperature to maximise the nucleation rate (common nucleating agents include TiO2 and ZrO2), and the temperature is then raised sufficiently to cause the nuclei formed to grow rapidly.

Glass ceramics are strong, reasonably tough, transparent to IR radiation, have a low coefficient of thermal expansion, a high resistance to thermal shock and a low thermal conductivity, which makes them very useful in domestic applications such as cookware and cooker hobs.

The most common glass ceramic system is LAS (Li2O-Al2O3-SiO2), but others include MgO-Al2O3-SiO2, Na2O-BaO-Al2O3-SiO2, and Li2O-MgO-Al2O3-SiO2.
Keywords: ceramic • glass • displacement • indentation • Plasticine
Categories: Science approaches > Microstructure
Science approaches > Phase transformations
Materials > Ceramics & glasses > Glasses > Glass ceramic
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Dr K M Knowles, Department of Materials Science and Metallurgy, University of Cambridge
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
Creative Commons Attribution Non-Commercial Share Alike logo
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • noncommercial – You may not use this work for commercial purposes.
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.
View the full legal code here.
Date created: 09 August 2002
Date added: 21 August 2009
Package: DoITPoMS Micrograph Library
Resource ID: 1202