高速烧结工艺对高透明氧化锆的透明度、力学性能、微观结构、晶体学及低温降解的影响
Influence of high-speed sintering protocols on translucency, mechanical properties, microstructure, crystallography, and low-temperature degradation of highly translucent zirconia.
作者信息
Liu Hengyi, Inokoshi Masanao, Nozaki Kosuke, Shimizubata Makoto, Nakai Hiroto, Cho Too Thaw Di, Minakuchi Shunsuke
机构信息
Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
出版信息
Dent Mater. 2022 Feb;38(2):451-468. doi: 10.1016/j.dental.2021.12.028. Epub 2021 Dec 24.
OBJECTIVES
Impacts of high-speed sintering on the optical and mechanical properties, microstructure, crystallography, and low-temperature degradation of commercial yttria-partially stabilized zirconia (Y-PSZ) were investigated.
METHODS
Five commercial Y-PSZ products (KATANA HT, KATANA STML, KATANA UTML, Zpex 4, and Zpex Smile) were investigated. Specimens were sintered following speed-sintering (90 min) and conventional-sintering protocols (7 h), and a group of KATANA STML was super-speed-sintered (18 min). Dimensions of the zirconia specimens after sintering were 14.5 mm (diameter) and 1.2 mm (thickness). Translucency was assessed using a colorimeter. Biaxial flexural strength was measured using a universal testing machine, followed by Weibull analysis. Scanning electron microscopy was used for microstructure assessments. X-ray diffraction was used to analyze the crystallography before and after hydrothermal aging. Low-temperature degradation (LTD) tests were performed at 134 °C under 2-3 bar water vapor in an autoclave.
RESULTS
The translucency and flexural strength were not affected significantly by the sintering programs (p > 0.05). The conventionally sintered KATANA STML and speed-sintered Zpex 4 presented the highest and lowest Weibull modulus, respectively. The conventionally-sintered Y-PSZ had a larger average grain size and smaller fraction of fine grains than those of the speed-sintered specimens. The fractographic analysis of the speed- and conventionally sintered Y-PSZ yielded comparable results. The speed-sintered Y-PSZ exhibited a lower c-ZrO content than that of conventionally-sintered Y-PSZ, except for KATANA HT and KATANA STML. LTD tests indicated that some of the speed and conventionally-sintered Y-PSZ exhibited similar monoclinic volume fractions.
SIGNIFICANCE
Speed-sintering programs are acceptable for Y-PSZ zirconia.
目的
研究高速烧结对商用钇部分稳定氧化锆（Y-PSZ）的光学和力学性能、微观结构、晶体学以及低温降解的影响。
方法
研究了五种商用Y-PSZ产品（KATANA HT、KATANA STML、KATANA UTML、Zpex 4和Zpex Smile）。按照高速烧结（约90分钟）和传统烧结方案（约7小时）对试样进行烧结，对一组KATANA STML进行超速烧结（18分钟）。烧结后氧化锆试样的尺寸为14.5毫米（直径）和1.2毫米（厚度）。使用色度计评估透明度。使用万能试验机测量双轴弯曲强度，随后进行威布尔分析。使用扫描电子显微镜进行微观结构评估。使用X射线衍射分析水热老化前后的晶体学。在高压釜中于134°C、2-3巴水蒸气条件下进行低温降解（LTD）试验。
结果
烧结程序对透明度和弯曲强度没有显著影响（p>0.05）。传统烧结的KATANA STML和高速烧结的Zpex 4分别具有最高和最低的威布尔模量。传统烧结的Y-PSZ比高速烧结的试样具有更大的平均晶粒尺寸和更小的细晶粒比例。对高速烧结和传统烧结的Y-PSZ进行的断口分析得出了可比的结果。除KATANA HT和KATANA STML外，高速烧结的Y-PSZ的c-ZrO含量低于传统烧结的Y-PSZ。LTD试验表明，一些高速烧结和传统烧结的Y-PSZ表现出相似的单斜晶体积分数。
意义
高速烧结方案对于Y-PSZ氧化锆是可接受的。
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