Optimization of stabilized magnetorheological fluids for high precision polishing processes

该项目源于PRIMA魁北克-韩国联合研究电话，将为下一代光学和电气设备开发高度稳定的磁流变抛光（MRP）系统。MRP方法是一种智能抛光工艺，其中研磨力由施加的磁场控制，从而允许对材料表面进行超精密抛光。已经进行了广泛的努力来使用MRP来精加工用于使用光学玻璃、硅、玻璃、锗、碳化硅等的高端光学和电气设备的材料的表面。为了获得高质量的产品，重要的是控制MRP悬浮液以防止磁流变流体在磁场之外分层（液压系统），而且在磁场的作用下实现抛光层内的有序结构。为此，MR流体的组成的优化是至关重要的。因此，该项目的核心推力是对具有不同分散相组成、粒径和分散介质中稳定聚合物特性的磁流变液的沉降行为和MRP性能进行理论和实验研究。 为了支持这一点，用于纳米颗粒的嵌段共聚物稳定剂的实验设计是至关重要的，因为其组成、链长和微观结构决定了稳定分散体的能力。通过对MRP系统的系统研究，我们将为MRP智能抛光系统开发优化的磁流变液成分。

This project, originating from a PRIMA Quebec-Korea joint research call, will develop a highly stable magnetorheological polishing (MRP) system for next-generation optical and electrical devices. The MRP method is a smart polishing process where the abrasive forces are controlled by the applied magnetic field, thereby allowing ultra-precise polishing of material surfaces. There have been extensive efforts to use MRP to finish the surface of materials serving in high-end optical and electrical devices using optical glass, silicon, glass, germanium, silicon carbide, etc. To obtain high-quality products, it is important to control the MRP suspension to prevent stratification of the magnetorheological fluid outside of the magnetic field (hydraulic system), but also to achieve an ordered structure within the polishing layer under the action of the magnetic field. To this end, optimization of the composition of MR fluids is crucial. Therefore, the core thrust of the project is to conduct theoretical and experimental studies on the sedimentation behaviour and MRP performance of magnetorheological fluids with different characteristics in terms of dispersed phase compositions, particle sizes, and stabilizing polymer in the dispersion medium. To support this, experimental design of the block copolymer stabilizer for the nanoparticles is critical, as its composition, chain length and microstructure dictate the ability to stabilize the dispersion. Through a systematic study on the MRP system, we will develop optimized MR fluid compositions for MRP smart polishing systems.