Optimization of stabilized magnetorheological fluids for high precision polishing processes

该项目源于魁北克和韩国的一次联合研究会议，将为下一代光学和电子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，从而实现对材料表面的超精密抛光。为了获得高质量的产品，必须控制磁流变液悬浮液以防止磁场外的磁流变液分层(液压系统)，而且要在磁场作用下实现抛光层内的有序结构，这一点非常重要。为此，优化磁流变液的组成至关重要。因此，本项目的核心内容是从分散相组成、颗粒大小、分散介质中的稳定聚合物等方面对不同特性的磁流变液的沉降行为和磁流变液的MRP性能进行理论和实验研究。为了支持这一点，纳米粒子的嵌段共聚稳定剂的实验设计至关重要，因为其组成、链长和微观结构决定了稳定分散的能力。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配方。

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.