A photoelasticity approach for characterization of defects in microwave drilling of soda lime glass
A photoelasticity approach for characterization of defects in microwave drilling of soda lime glass
复制标题
用于表征钠钙玻璃微波钻孔缺陷的光弹性方法
DOI：
10.1016/j.jmatprotec.2015.05.026
复制
发表时间：
2015
影响因子：
6.3
通讯作者：
S. Das
中科院分区：
文献类型：
--
作者：
N. K. Lautre;A. Sharma;Pradeep Kumar;S. Das
在包括生物技术在内的许多微型应用中，对钻微孔的需求一直在上升。这些特征的微加工很难实现，特别是在难以加工的硬脆材料如钠钙玻璃上。在微纳米尺度上精确的缺陷表征更具挑战性。传统的方法似乎在这种情况下，而制造以及在表征不足。在本工作中，使用一种称为“微波钻孔”的新型热基方法在钠钙玻璃上钻了直径900 μm的孔。它利用了通过工具施加微波能量产生等离子体热的热消融现象。在多模式施加器中在2.45 GHz下在90-900 W的范围内施加能量。玻璃样品经受高局部化热，这也导致了一些缺陷，如由于在钻孔区域中熔化而导致的破裂和变形。采用光弹性方法来表征这些缺陷。使用偏振器和CCD相机开发了一种装置以获得双折射图案。分析图案以评估缺陷。对微波打孔过程进行了数值模拟，研究了应力-温度关系。仿真结果证实了实验观察。细节与证据进行了讨论。
Need for drilling micro holes has been on rise in many miniature applications including biotechnology. Micro machining of such features is difficult to realize, particularly on difficult-to-machine hard and brittle materials like soda lime glass. Defect characterization with precision in micro-nano scale is even more challenging. Conventional approaches appear inadequate in such cases while fabrication as well as in characterization. In the present work, holes of 900 μm diameter were drilled on soda lime glass using a novel thermal-based approach called ‘microwave drilling’. It uses the phenomenon of thermal ablation with plasma heat created by the applied microwave energy through a tool. The energy was applied in the range of 90–900 W at 2.45 GHz in a multi-mode applicator. The glass specimens were subjected to high localized heat, which also caused some defects like cracking and deformation due to melting in the drilling zone. A photoelasticity approach was employed to characterize these defects. A setup was developed using a polarizer and a CCD camera to obtain the birefringence patterns. The patterns were analyzed to assess the defects. The microwave drilling process was also simulated and the stress-temperature relationships were studied. Simulation results substantiated the experimental observations. Details are discussed with evidences.