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단시간과 장시간의 소결방법에 따른 지르코니아의 굴곡 강도와 미세구조의 변화

The effect of short and long duration sintering method on microstructure and flexural strength of zirconia

대한치과기공학회지 2020년 42권 2호 p.73 ~ 79
이하빈, 이태희, 김지환,
소속 상세정보
이하빈 ( Lee Ha-Bin ) - Korea University College of Health Science Department of Dental Laboratory Science and Engineering
이태희 ( Lee Tae-Hee ) - Korea University College of Health Science Department of Dental Laboratory Science and Engineering
김지환 ( Kim Ji-Hwan ) - Korea University College of Health Science Department of Dental Laboratory Science and Engineering

Abstract


Purpose: The aim of this study was to investigate the influence of short and long duration sintering on microstructure and flexural strength of zirconia.

Methods: To conduct three-point bending test, Zirconia specimens are milled according to ISO 6872 guidelines(N=18, n=9 per group). Two specimens group(n=8) is sintered for 10 hours(Standard schedule) and 3 hours(Speed schedule) at the peak temperature of 1550℃ with silicon carbide sintering furnace. Flexural strength of specimens are measured by instron. After coating each specimen(n=1), microstructure of specimens is observed using Scanning Electron Microscope(SEM). T-test was utilized to statistically assess the data.

Results: The mean and standard deviation value of the flexural strength for standard schedule group are 578.15±57.48Mpa, that of speed schedule are 465.9±62.34Mpa. T-test showed significant differences in flexural strength between two zirconia specimen group which applied standard schedule and speed schedule respectively(p<0.05).

Conclusion: The result of this study showed that the increase in sintering time led to increased grain size, and also to a positive effect on the flexural strength.

키워드

3-point bending test; Flexural strength; Microstructure; SIC Furnace; Sintering schedule; Zirconia

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