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An Evaluation of the Fracture Toughness of Alumina-Glass Composites by Melt-Infiltration Processing of Y2O3 Containing Borosilicate Glasses
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KMID : 0362219980250020201
Abstract
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¿ëÀ¶Ä§Åõ¹ýÀ¸·Î Á¦Á¶ÇÑ ´ÙÀ½, ÀÌµé º¹ÇÕüÀÇ ±â°ø·ü°ú Æı«Àμº, Æı«¾ç»óÀ» Á¶»çÇÑ °á°ú ´Ù
À½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. º¹ÇÕüÀÇ °Ñº¸±â ±â°ø·üÀº ¾à 0.2%·Î À¯¸®Á¶¼º¿¡ µû¶ó À¯»çÇÑ °ªÀ» ³ªÅ¸³»¾ú´Ù.
2. º¹ÇÕüÀÇ Æı«ÀμºÀº 4.2-4.72 MPa m1/2 °ªÀ» º¸¿´´Ù.
3. ¾Ë·ç¹Ì³ª-À¯¸® º¹ÇÕüÀÇ ÆĸéÀ» °üÂûÇÑ °á°ú Ç¥¸é±Õ¿Àº Palmqvist crack ¾ç»óÀ» º¸¿´
À¸¸ç ±Õ¿ÁøÀü°úÁ¤¿¡¼ ¹Ì¼¼Á¶Á÷ÀÇ ±âÇÏÇÐÀûÀÎ ¸¶ÂûÀÛ¿ëÀ¸·Î ÀÎÇØ °ÅÄ£ ÆĸéÀÌ Çü¼ºµÇ´Â ¾ç
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The study was performed to evaluate the fracture toughness of dental alumina-glass
composites. Alumina compacts were prepared by press 150kg/cm2 and
sintering at 1100¡É for 2hrs. Dense composites were made by infiltrating partially
sintered alumina with four different borosilicate glasses containing 1, 3, 6, 9 mol%
Yttria(Y2O3) at 1200¡É for 6hrs. Apparent porosity was
measured by the KS L 3114 principle method. Fracture toughness was measured by a
single edge V-notched beam(SEVNB) method with a 2.5¡¿5¡¿20 mm rectangular bar.
Fracture toughness values were about ¡4.72 MPa¤ým1/2. Porosity rates of
alumina-glass composites were about 0.2%. The fracture surface of the alumina-glass
composites showed a Palmqvist crack pattern at the fracture origin and indicated a
tendency of toughening by the frictional interlocking between the microstructurally rough
fracture surfaces.
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Alumina-glass composite; Fracture toughness; Infiltration Alumina;
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