不同表面处理及老化对氧化锆陶瓷抗折强度的影响

Influence of surface treatment and degradation on the flexural strength of zirconia ceramics

目的研究打磨、抛光、上釉及老化对氧化锆陶瓷抗折强度的影响。方法将36片氧化锆陶瓷分成打磨组、抛光组、上釉组3组,每组试件按不同的老化时间分为0 h组(对照组)和10 h组(n=6)。将10 h组瓷块置于134℃,0.2 MPa的水热环境下,进行10 h的老化试验。每组各取一个试件,用X线衍射(X-ray diffraction,XRD)仪测定单斜相含量,万能力学试验机测试所有试件抗折强度。结果 XRD分析显示老化前的所有试件均未显示单斜相。老化后所有组均出现单斜相,打磨组单斜相含量最高,上釉组最低。抗折强度所有组均无统计学意义(P>0.05)。结论老化后所有试件单斜相含量均有所增加,但打磨、抛光、上釉及老化处理对氧化锆陶瓷抗折强度未产生影响。

Objective To evaluate the influence of grinding,polishing,glazing,and degradation on the flexural strength of zirconia ce- ramics. Methods 36 specimens of zirconia ceramics were divided into 3 groups （ grinding, polishing, and glazing） , and specimens in each group were further divided into two groups based on different aging time,denoted as group 0 h （as control） and group 10 h （n = 6）. The specimens in group 10 h were autoclaved at 134 ℃ ,0.2 MPa for 10 h. X-ray diffraction （XRD） was used to estimate the rela- tive amount of monoclinic phase of one specimen in each group. Additionally,three-point flexure test was used to calculate the flexural strength. Results No specimens exhibited the monoclinic phase before degradation. All groups exhibited an increase in the amount of monoclinic phase after degradation. The grinding group exhibited the highest amount of monoclinic phase, and the lowest amount was oh- served in the glazing group. Flexural strength test revealed that there were no significant differences regarding the flexural strength of any group （P 〉 0.05）. Conclusions Although all groups exhibited an increase in the amount of monoclinic phase after degradation,there was no influence of grinding,polishing,glazing,and degradation on the flexural strength of zirconia ceramics.