A novel Non-Newtonian fluid polishing technique for zirconia ceramics based on the weak magnetorheological strengthening thickening effect
A novel Non-Newtonian fluid polishing technique for zirconia ceramics based on the weak magnetorheological strengthening thickening effect
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DOI：
10.1016/j.ceramint.2021.11.280
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发表时间：
2022-02-05
影响因子：
5.2
通讯作者：
Li, X.
中科院分区：
文献类型：
--
作者：
Ming, Y.;Huang, X.;Li, X.
氧化锆陶瓷具有优异的物理和化学性能，具有多种应用。然而，由于氧化锆陶瓷的硬度和脆性，很难实现其无损高效加工。在此，我们提出了一种基于弱磁流变强化增稠效应的高效氧化锆陶瓷非牛顿流体抛光方法。研究了氧化锆陶瓷表面纳米级材料的去除和演变机制。基于扫描电镜观察结果和对抛光区流体剪切力模型的推导，阐明了加工过程中材料去除的微观机理，并建立了材料去除率的预测模型。表面质量的检测结果与建立的材料去除机理相吻合。材料去除率模型能有效地预测加工过程，平均相对误差为4.45%。实验结果表明，弱磁流变剪切增稠抛光（WMRSTP）方法可以实现半球形氧化锆陶瓷工件的无损、自适应超精密加工。与传统的非牛顿流体抛光方法相比，该方法的抛光质量和抛光效率都有显著提高。WMRSTP 1小时后氧化锆半球形工件的表面粗糙度Sa、表面精度PV和材料去除速率MRR分别为13.2 nm、0.104 μ m和5.96 μ m/h。
Zirconia ceramics have excellent physical and chemical properties and have several applications. However, owing to their hardness and brittleness, it is difficult to realise the non-destructive high-efficiency machining of zirconia ceramics. Herein, we propose an efficient non-Newtonian fluid polishing method for zirconia ceramics based on the weak magnetorheological strengthening thickening effect. The nanoscale material removal and evolution mechanisms of the zirconia ceramic surface were investigated. Based on the results obtained through scanning electron microscopy and a derivation of the fluid shear stress model in the polishing zone, we clarify the microscopic material removal mechanism during the machining process, and establish the prediction model of material removal rate. The detection results of the surface quality were in good agreement with the established material removal mechanism. The model of material removal rate could predict the processing effectively, and the average relative error was 4.45%. The experimental results demonstrate that the proposed weak magnetorheological shear thickening polishing (WMRSTP) method can realise lossless, self-adaptive, ultra-precision machining of a hemispherical zirconia ceramic workpiece. Compared to the traditional non-Newtonian fluid polishing method, the polishing quality and polishing efficiency of this method are significantly improved. The surface roughness Sa, the surface accuracy PV, and the material removal rate MRR of the zirconia hemispherical workpiece after 1 h of WMRSTP were 13.2 nm, 0.104 mu m, and 5.96 mu m/h, respectively.