용융침투법에 의한 알루미나-유긴 복합체의 개발에 대한 연구
A Study on the Development of Dental Alumina-glass Composites by Melt -infiltration Process
소속 상세정보
안승근/Sung-Gun Ahn
송창용/원대희/이주형/배태성/Chang-Young Song/Dae-Hee Won/Tae-Sung Bae/Ju-Hyung Lee
KMID : 0362219990260010083
Abstract
결론
본 연구에서는 고강도 세라믹스 소결체를 얻기 위해 이트리아, 산화리튬, 지르코니아 등을
첨가한 붕규산염계 유리를 제조한 다음 이들 조성의 변화가 유리의 성질과 알루미나-유리
복합체의 기계적 성질에 미치는 영향에 대하여 조사한 결과 다음과 같은 결론을 얻었다.
1. 알루미나 소결체의 기공률을 결합제 PVA의 양이 0.013%에서 26.3%으로 가장 작게 나
타내었다.
2. 용융침투용 유리의 열팽창계수는 유리의 조성변화에 따라 6.30 ∼ 6.36×10-6/%의 값
을 나타내었다.
3. 2축 굽힘 강도는 지르코니아가 함유된 알루미나-유리 복합체에서 383.27MPa로 치대
값을 나타내었다.
4 알루미나-유리 복합체의 파면에서는 균열의 굴곡과 가교로 형성된 요철면 사이의 마찰
작용으로 인한 강화기전이 관찰되었다.
#초록#
The purpose of this study was to evaluate the mechanical properties of alumina-glass
dental composites. Four different borosilicate glasses were prepared, and thermal
expansion coefficient was measured from 200 to 600 。C.
An a -alumina powder wish average particle size of 4.6 ㎛ was used for the matrix.
Porous alumina compacts of 12 mm in diameter and 1 mm thickness were prepared by
slip casting and sintering at 1100。C for 2 hours. Dense composites were made by
infiltration of molten glass into partially sintered alumina at 1200 。C for 6 hours.
Specimens were polished sequentially from #400 to #2000 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. The scanning
electron microscopy (SEM) was performed on a polished surface which was etched with
0.5% HF solution for 30 to 40s.
The results of this study were obtained as follows :
1. The lowest porosity rate of 26.3% was achieved at the PVA content of 0.013%.
2. The coefficietn of thermal expansion of borosilicate galsses ahowed in the range of
6.30 to 6.46×10-6/。C.
3. The maximum biaxial strength of 383.27 MPa was obtained with an addition of 4
㏖% ZrO2.
4. The observation of fracture surfaces of alumina-glass composites indicated the
frictional interlocking of jogs having a tendency of toughening by crack deflection and
crack bridging.
키워드
alumina-glass composite; melt-infiltration; borosilicate glass;
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