치과응용을 위한 알루미나-유리 복합체 제조
Processing of Alumina-glass Composites for Dental Applications
소속 상세정보
1/2진영철/12Young Cheol Jin
5/6원대희/5/6강동진/3/4이민호/5/6배태성/34Min Ho Lee/56Dae Hee Won/56Dong Jin Kang/56Tae Sung Bae
KMID : 0362220000270020135
Abstract
-Abstract-
The purpose of this study was to evaluate the mechanical properties of alumina-glass
dental composites. Four different borosilicate glasses containing 1, 2, 3, 4 mol%
Li2O were prepared. Porous alumina compacts of 12.0 ㎜ in diameter and
1.0 ㎜ in thickness were prepared with alumina powders of 1.8 and 4.6 ㎛ by slip
casting and sintered at 1,120℃ for 6 hours. All samples were polished sequentially from
#600 to #2,000 diamond disk, and the final surface finishing on the tensile side was
received an additional polishing sequence through 0.3 ㎛ diamond paste. Apparent
porosity of alumina-glass composites was measured by means of the KS L 3114
method. Biaxial flexure test was conducted by using ball-on-three-ball method at a
crosshead speed of 0.5 ㎜/min. To examine the microstructural aspect of crack
propagation, Vickers-produced indentation crack and fracture surfaces were examined by
SEM. The results obtained were summarized as follows;
1. Apparent porosity rate decreased according to the increasing with the particle size
of alumina.
2. The maximum biaxial flexure strength of 365.26 MPa was obtained with an
addition of 4 mol% Li2O in glass composition.
3. The maximum fracture toughness of 3.95 MPa ㆍ m1/2 was obtained
with an addition of 3 mol% Li2O.
4. The crack deflection and crack bridging were the principal strengthening
mechanisms in the alumina-glass composites.
키워드
alumina-glass composite; infiltration; slip casting; crack deflection and bridging;
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