Post-Graduate Program in Oral Science, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil.
Post-Graduate Program in Chemical Engineering, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil.
J Mech Behav Biomed Mater. 2021 Aug;120:104543. doi: 10.1016/j.jmbbm.2021.104543. Epub 2021 Apr 21.
This study evaluated the effect of distinct surface treatments on the fatigue behavior (biaxial flexural fatigue testing) and surface characteristics (topography and roughness) of a 5% mol yttria partially stabilized zirconia ceramic (5Y-PSZ). Disc-shaped specimens of 5Y-PSZ (IPS e.max ZirCAD MT Multi) were manufactured (ISO 6872-2015) and allocated into six groups (n = 15) considering the following surface treatments: Ctrl - no-treatment; GLZ - low-fusing porcelain glaze application; SNF - 5 nm SiO nanofilm; AlOx - aluminum oxide particle air-abrasion; SiC - silica-coated aluminum oxide particles (silica-coating); and 7%Si - 7% silica-coated aluminum oxide particles (silica-coating). The biaxial flexural fatigue tests were performed by the step-stress method (20Hz for 10,000 cycles) with a step increment of 50N starting at 100N and proceeding until failure detection. The samples were tested with the treated surface facing down (tensile stress side). Topography, fractography, roughness, and phase content assessments of treated specimens were performed. GLZ group presented the highest fatigue behavior, while AlOx presented the lowest performance, and was only similar to SiC and 7%Si. Ctrl and SNF presented intermediary fatigue behavior, and were also similar to SiC and 7%Si. GLZ promoted a rougher surface, Ctrl and SNF had the lowest roughness, while the air-abrasion groups presented intermediary roughness. No m-phase content was detected (only t and c phases were detected). In conclusion, the application of a thin-layer of low-fusing porcelain glaze, the deposition of silica nanofilms and the air-abrasion with silica-coated alumina particles had no detrimental effect on the fatigue behavior of the 5Y-PSZ, while the air-abrasion with alumina particles damaged the fatigue outcomes.
本研究评估了不同表面处理方法对 5%氧化钇部分稳定氧化锆陶瓷（5Y-PSZ）的疲劳性能（双轴弯曲疲劳试验）和表面特性（形貌和粗糙度）的影响。采用 ISO 6872-2015 标准制造了 5Y-PSZ（IPS e.max ZirCAD MT Multi）圆盘状试件，并根据以下表面处理方法将其分为六组（n=15）：对照组（无处理）；GLZ 组（低温烤瓷粉应用）；SNF 组（5nm SiO 纳米薄膜）；AlOx 组（氧化铝颗粒空气喷砂）；SiC 组（硅涂层氧化铝颗粒）；7%Si 组（硅涂层氧化铝颗粒）。双轴弯曲疲劳试验采用逐步应力法（20Hz，10000 次循环）进行，从 100N 开始，每 50N 为一个步长递增，直至试件失效。对处理后的表面朝下（拉伸侧）的试件进行测试。对处理后的试样进行形貌、断口形貌、粗糙度和相含量评估。GLZ 组的疲劳性能最高，而 AlOx 组的疲劳性能最低，与 SiC 和 7%Si 相似。对照组和 SNF 组的疲劳性能居中，也与 SiC 和 7%Si 相似。GLZ 组的表面粗糙度最高，对照组和 SNF 组的表面粗糙度最低，而空气喷砂组的表面粗糙度居中。未检测到 m 相含量（仅检测到 t 和 c 相）。综上所述，低温烤瓷粉的应用、二氧化硅纳米薄膜的沉积以及硅涂层氧化铝颗粒的空气喷砂对 5Y-PSZ 的疲劳性能没有不利影响，而氧化铝颗粒的空气喷砂则损害了疲劳结果。
