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An Evalution of the Strength of Alumina-Glass Composites by Melt-Infiltration Processing of Y2O3 Containing Borosilicate Glasses

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Abstract

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ÇÕüÀÇ °­µµ¿¡ ¹ÌÄ¡´Â ¿µÇâ¿¡ °üÇÏ¿© Á¶»çÇÏ¿´À¸¸ç, ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. ÀÌÆ®¸®¾ÆÀÇ ÇÔ·®ÀÌ Áõ°¡ÇÒ¼ö·Ï ¹ß¿­ ÇÇÅ©¿Í ¿¬È­Á¡ÀÌ °í¿ÂÃøÀ¸·Î À̵¿ÇÏ´Â °æÇâÀ» º¸
¿´´Ù.
2. À¯¸®ÀÇ ¿­ÆØâ°è¼ö´Â ÀÌÆ®À̶óÀÇ ÇÔ·® º¯È­¿¡ µû¶ó 6.36¿¡¼­ 6.56¡¿10-6
/¡ÉÀÇ °ªÀ» º¸¿´´Ù.
3. 2Ãà±ÁÈû°­µµ´Â ÀÌÆ®¸®¾ÆÀÇ ÇÔ·®ÀÌ 6mol%ÀÏ ¶§ 385.7¡¾34.4MPa·Î Ãִ븦 º¸¿´´Ù.
4. ¾Ë·ç¹Ì³ª-À¯¸® º¹ÇÕüÀÇ Æĸ鿡¼­´Â ÁÖ·Î crack deflection°ú crack bridging¿¡ ÀÇÇÑ °­
È­±âÀüÀÌ °üÂûµÇ¾ú´Ù.

This study was performed to investigate the strength of dental alumina-glass
composites. Four different brosilicacte glasses containing 1, 3, 6, 9 mol%
Y2O3 were prepared. Alumina compacts were prepared by
pressing 150§¸/cm2 and sintering at 1100¡É for 2 hours. Dense composites
were made by infiltrating partially sintered alumina with at 1200¡É for 6 hours.
The obtained results were summarized as follows:
1. With increasing the amount of Y2O3, the peak of
exothermic heat and softening point were shifted to the higher temperature.
2. Borosilicate glasses showed the coefficient of thermal expansion in the range of
6.36 to 6.16¡¿10-6/¡É.
3. The maxium biaxial strength of 385.7¡¾34.4MPa was obtained with an addition of
6mol% Y2O3.
4. The observation of fracture surfaces showed the crack deflection and crack bridging
and that appeared to be the principal strengthening mechanism in the alumina-glass
composites.

Å°¿öµå

alumina-glass composite; melt-infiltration process; crack deflection; crack bridging;

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