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Magnetorheological (MR) Polishing of Alumina-Reinforced Zirconia Ceramics Using Diamond Abrasives for Dental Application

2012; Taylor & Francis; Volume: 27; Issue: 10 Linguagem: Inglês

10.1080/10426914.2011.654155

1532-2475

Kwang‐Pyo Hong, Yong-Kyu Cho, Bong-Cheol Shin, Myeong‐Woo Cho, Seung‐Bok Choi, Won-Seung Cho, Jae-Jin Jae,

Tunneling and Rock Mechanics

In this study, ultraprecise polishing of alumina reinforced zirconia ceramics using magneto rheological (MR) fluids and diamond abrasives was investigated. First, alumina-reinforced zirconia composites, containing 0 to 30 vol% alumina, were fabricated by cold isostatic pressing at 150 MPa. The green compacts were then sintered at 1,550°C for 2 h 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 scanning electron microscope (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.