Glass-Ceramics

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Glassy materials that exhibit such a structure are called glass ceramics. (From <FONT SIZE="3" COLOR="#0000FF" FACE="Comic Sans MS" ><A HREF="http://www.britanicca.com/bcom/eb/article/1/0,5716,114831+1,00.html" TARGET="_top" TITLE="http://www.britanicca.com/bcom/eb/articl"><U>Encyclopedia Britanica</U></A></FONT>)</div> <div> Glass ceramics are now becoming well established as engineering materials, enabling the ranges covered by  conventional glasses and sintered ceramics to be extended and diversified considerably. Investigating into their use in a wide range of technical and engineering applications is   proceeding through out the world and indeed, certain areas, for example microwave radomes, vacuum envelopes, laser envelopes, telescope mirrors and domestic cooker tops, cooking ware, their use id well established.</div> <div> Glass-ceramics are inorganic materials, generally but not necessarily silicate base materials, which are initially prepared as glasses and which in bulk form, are shaped by glass-forming techniques. They are then process further by suitable heat-treatments to develop, first nuclei in the glass and subsequently crystal phases.(<FONT SIZE="3" COLOR="#3300FF" FACE="Comic Sans MS" ><A HREF="id42.htm" TARGET="_top" TITLE="References"><U>Ref.1</U></A></FONT>)</div> <bR> <DIV ALIGN="LEFT"></DIV> <div> <IMG SRC="07e75da0.gif" border=0 width="373" height="218" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <div> Figure illustrate typical a  heat-treatment cycle for such glass-ceramic with <FONT SIZE="3" COLOR="#0000FF" FACE="Comic Sans MS" >nucleation and crystallization</FONT> temperature holds. The heat treatment process is so design the product obtained has a uniform and fine-grain structure containing only small amounts of residual vitreous phase. The process is advantageous in particular,the homogeneous glass acquires a very uniform ceramic like  structure exhibit a high strength and various specific properties. (<FONT SIZE="3" COLOR="#3300FF" FACE="Comic Sans MS" ><A HREF="id42.htm" TARGET="_top" TITLE="References"><U>Ref.2</U></A></FONT>)</div> <bR> <div> <FONT SIZE="3" COLOR="#CC6699" FACE="Comic Sans MS" >Through controlled crystallization of a glass the variation on </FONT><A HREF="id17.htm" TARGET="_top" TITLE="Properties"><U>properties</U></A> <FONT SIZE="3" COLOR="#CC6699" FACE="Comic Sans MS" >of the glass-ceramic can be expanded even more.</FONT></div> <bR> <bR> </td> </tr></table></body>