Laser-Assisted Rapid Surface Microstructuring of Alumina Ceramic

该奖项的研究目标是开发一种新的激光辅助陶瓷快速表面微结构化技术，该技术具有结构，电子和生物医学应用的潜力。在目前的努力中，该技术将探索氧化铝的精密磨削/加工的特定目的。该方法是基于工程的高度有序和多边形面的表面晶粒，其特征在于多个边缘和顶点。该提案将发展的理解，由于快速凝固的晶体学和形态学的表面纹理的演变。这些信息将用于预测材料去除率方面的加工/磨削性能。基于实验和建模方法的综合方法将适用于理解激光表面微结构化过程中的物理现象，并评估其对精密磨削性能的影响。建模工作将集中在温度演变，微观结构演变和磨削性能，并最终建立加工-微观结构-性能的相关性。 拟议研究的成功执行将导致开发一种基于激光的技术，用于快速改造商用氧化铝砂轮，以实现高效和精密（微尺度）加工/磨削。光纤传输激光束的非接触性质将促进远程和在线或同时工程化具有多面晶粒的表面微结构，所述多面晶粒具有微切割边缘和顶点，用于材料的微尺度精密加工/研磨。由于激光加工的快速性，实验和计算建模的集成将基于热力学/动力学原理扩展到近平衡和/或非平衡条件。技术的发展和对潜在物理现象的理解将促进其扩展到其他磨削/加工材料系统，如cBN和金刚石。该研究将通过建立实验和计算基础作为下一代工程设计工具，在微观水平上建立工程表面的基础。该项目由&土木、机械和制造创新（CMMI）部门的材料加工制造（MPM）计划共同资助。化学、生物工程、环境和运输系统（CBET）部门的热运输过程（TTP）计划;由EPSCoR，并由工程局（ENG）提供的资金，以支持跨部门的研究。

The research objective of this award is the development of a novel technique of laser-assisted rapid surface microstructuring of ceramics with potential in a range of structural, electronic, and biomedical applications. In the present effort, the technique will be explored for alumina for the specific purpose of precision grinding/machining. The approach is based on engineering of highly ordered and polygonal faceted surface grains characterized by multiple edges and vertices. The proposal will develop an understanding of evolution of crystallographic and morphological surface textures due to rapid solidification. This information will be employed in prediction of the machining/grinding performance in terms of material removal rates. An integrative approach based on experimental and modeling methodologies will be adapted to understand the physical phenomena during laser surface microstructuring and its influence on precision grinding performance will be evaluated. Modeling efforts will be focused on temperature evolution, microstructure evolution, and grinding performance, and finally processing-microstructure-property correlation will be established. The successful execution of proposed research will lead to development of a laser-based technique for rapid transformation of commercial alumina grinding wheel for efficient and precision (micro-scale) machining/grinding. The non-contact nature of fiber delivered laser beam will facilitate the remote and online or simultaneous engineering of surface microstructure with multi-faceted grains with micro-cutting edges and vertices for micro-scale precision machining/grinding of materials. Due to the rapid nature of laser processing, integration of experimental and computational modeling will be based on extension of thermodynamic/kinetic principals to near- and/or non-equilibrium conditions. The development of technique and understanding of underlying physical phenomena will facilitate its extension to other grinding/machining material systems such as cBN and diamond. This research will establish a basis for engineering surfaces at microscopic level through creation of experimental and computational foundations as next-generation engineering design tool.This project is jointly funded by the Materials Processing & Manufacturing (MPM) Program, of the Civil, Mechanical, and Manufacturing Innovation (CMMI) Division; by the Thermal Transport Processes (TTP) Program, of the Chemical, Bioengineering, Environmental, and Transport Systems (CBET) Division; by EPSCoR, and by funding provided from the Directorate for Engineering (ENG) to support Inter Divisional Research.