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Evaluation of fracture toughness of zirconia ceramics with heterogeneous yttrium distribution microstructures
Journal of the Australian Ceramic Society ( IF 1.8 ) Pub Date : 2020-05-11 , DOI: 10.1007/s41779-020-00474-0
Jinping Cui , Wei Zhao , Kang Guan , Pinggen Rao

Yttrium stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics containing 2 mol% and 2.5 mol% yttria were prepared by mixing 3 mol% yttria-doped zirconia powders with yttria-free zirconia powders. The microstructures of the sintered samples were studied using SEM, XRD, and Raman spectra. In addition, an ultra-sharp V-notch (ρ < 0.5 μm) was induced by femtosecond laser to measure its actual fracture toughness by single-edge V-notched beam (SEVNB) method. The results reveal that mixture-based Y-TZP with 2.5 mol% yttria has deeper phase transformation depth, and fracture toughness of 6.4 MPa.m1/2 is obtained. The heterogeneous distribution of the yttrium is taken account for the excellent properties.



中文翻译:

异质钇分布微结构对氧化锆陶瓷断裂韧性的评价

通过将3摩尔%的掺杂氧化钇的氧化锆粉末与无钇的氧化锆粉末混合,制备了包含2摩尔%和2.5摩尔%氧化钇的钇稳定的四方氧化锆多晶(Y-TZP)陶瓷。使用SEM,XRD和拉曼光谱研究了烧结样品的微观结构。此外,飞秒激光诱发了一个超锐利的V形缺口(ρ<0.5μm),并通过单边V形缺口(SEVNB)方法测量了其实际的断裂韧性。结果表明,具有2.5 mol%氧化钇的混合物基Y-TZP具有更深的相变深度,断裂韧性为6.4 MPa 获得m 1/2。钇的非均质分布被认为具有优异的性能。

更新日期:2020-05-11
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