MR Polishing of Alumina Reinforced Zirconia Ceramics Using Diamond Abrasives

초록

In this study, ultra-precise polishing of alumina reinforced zirconia ceramics using magnetorheological (MR) fluids and diamond abrasives was investigated. First, aluminareinforced zirconia composites, containing 0 to 30 vol% alumina, were fabricated by cold isostatic pressing at 150 MPa. The green compacts were then sintered at 1550°C for 2h in air. Mechanical properties and microstructures of the composites were observed. Second, a series of MR polishing experiments were performed for composites containing 20 vol% of alumina under various polishing conditions. MR polished surfaces were observed using a SEM and surface profiler to investigate the variation of the surface integrity. A very fine surface roughness of Ra = 1.960 nm was obtained after 60 minutes of MR polishing using diamond abrasives.