• • Infiltration of 5% PEI solution increases CNT fiber tensile strength by ~175% compared to pure CNT fibers, addressing interfacial slippage that limits mechanical performance.
• • Electrophoretic deposition achieves uniform adhesion of CeO2 abrasive particles onto PEI-reinforced CNT fibers, enabling composite fiber fabrication without compromising fiber integrity.
• • A flexible polishing tool woven from CeO2-CNT fibers reduces KDP crystal surface roughness from 200 nm to 7.6 nm within 10 minutes, a 96% reduction after 15 minutes, demonstrating high-efficiency precision polishing.
• • The method is adaptable to various abrasives, offering a scalable route to fabricate high-performance polishing tools for brittle materials like KDP crystals.