주입성형한 지르코니아 소결체의 기계적 성질에 미치는 알루미나 첨가의 영향
Effects of the Addition of Alumina on the Mechanical Properties of Cast Zirconia Sintered Body
이동윤, 조준호, 서정일, 배원태,
소속 상세정보
이동윤 ( Lee Dong-Yoon ) - 진주보건대학 치기공과
조준호 ( Jo Jun-Ho ) - 진주보건대학 치기공과
서정일 ( Seo Jeong-Il ) - 경상대학교 나노신소재공학부
배원태 ( Bae Won-Tae ) - 경상대학교 나노신소재공학부
KMID : 0362120120340020113
Abstract
Purpose: Zirconia blocks for all ceramic dentures are divided into two groups. One is pre-heated block and the
other is binder added block. In this study, the possibility of recycling the remained parts of binder added block after CAD/CAM machining with slip casting process was investigated.
Methods: Owing to the binder added block contain large amount of organic matter, Binder burn-out was must be
carried out before ball milling for preparing the casting slip. Binder burn-out was accomplished at 600 for 10 hours. Ball milling was performed with 5 zirconia ball and 60 polyethylene bottle. From 0% to 5% at 1% intervals of alumina was added to zirconia powder for preparing slip. Solid casting was achieved with plaster mold. Cast bodies were dried and sintered at 1,500 for 1 hour. Linear shrinkage, apparent porosity, water absorption, bulk density, and flexural strength were tested. Microstructures were observed by SEM, EDS and XRD analysis were executed.
Results: Optimum slips for casting was prepared with 300g ball, 100g powder, and 180g distilled water. Cast body without alumina showed 26% of linear shrinkage, 6.07 of apparent density, and 470 of three point bend strength. On the other hand, as received zirconia block, which was sintered at the same conditions, showed 23% of linear shrinkage, 6.10 of apparent density, and 680 of three point bend strength. When 3% of alumina was added to zirconia, sintered body showed 23% of linear shrinkage, 6.10 of apparent density, and 780 of three point bend strength. SEM photomicrographs and EDS analysis showed alumina particles uniformly dispersed in zirconia matrix, and XRD analysis showed no phase transformation of tetragonal zirconia particles was occurred when alumina was added.
Conclusion: According to the all of this experimental results, 3% of alumina added cast zirconia body showed
excellent mechanical properties more than as received binder containing zirconia block.
키워드
zirconia; slip casting; linear shrinkage; flexural strength; ball-milling
원문 및 링크아웃 정보
등재저널 정보