This paper presents a study of fabricating micro-dimples with desired morphology characteristics using micro-abrasive jet machining. Experiments are conducted under different processing conditions so that blasted dimples with various sizes and geometries could be obtained and analysed. The results indicated that among all the processing factors used in this study, changing processing time and air pressure is found to be the most efficient and controllable way to vary dimple dimension. On the other hand, nozzle stand-off distance and air pressure both play a pivotal role in determining dimple geometry. The results indicate that a variety of desired morphologies on the blasted area could be obtained by optimizing parameter combination. To further reveal the mechanism of shape variation, an amended model of cross-sectional particle velocity distribution is proposed. By correlating the working conditions and the final form of machined micro-structures, the model is confirmed to be an effective indicator to present the machining performance. In the end, friction tests and wear characterization are conducted to verify the positive effect of the introduced micro-texture on improving the lifespan of ceramic-based workpieces.

本文介绍了使用微磨料射流加工制造具有所需形态特征的微凹坑的研究。在不同的加工条件下进行实验，以便获得和分析具​​有各种尺寸和几何形状的喷砂凹坑。结果表明，在本研究中使用的所有加工因素中，发现改变加工时间和气压是改变凹坑尺寸的最有效和可控的方式。另一方面，喷嘴间距和空气压力在确定凹坑几何形状方面都起着关键作用。结果表明，通过优化参数组合，可以在爆破区域获得多种所需的形态。为了进一步揭示形状变化的机制，提出了一种修正的横截面粒子速度分布模型。通过将工作条件与加工后的微观结构的最终形式相关联，该模型被确认为呈现加工性能的有效指标。最后，进行摩擦测试和磨损表征，以验证引入的微纹理对提高陶瓷基工件的使用寿命的积极影响。