期刊
SURFACE & COATINGS TECHNOLOGY
卷 206, 期 19-20, 页码 4293-4302出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.04.043
关键词
Air abrasion; Dental zirconia (Y-TZP); Phase transformation
This study aimed to evaluate the effect of different blasting pressures and airborne particle composition and size on phase transformation and surface morphological change of yttria-stabilized tetragonal polycrystalline zirconia (Y-TZP). Specimens sintered at 1350 degrees C for 2 h were abraded with 50 and 110 mu m alumina and 30 and 110 mu m silica-coated alumina particle at pressures of 1, 1.5, 2, 2.5, 3 and 3.5 bar. It was found that air abrasion changes the morphology of the Y-TZP ceramic surface. Flaws, microcracks, plastic deformations, pits, embedding of airborne particle on the ceramic surface, cluster of loosely nano-silica particle, melting of ceramic surface, coating of surface with non-uniform loosely nano-silica particle and t-m phase transformation were observed after air abrasion process. The extent of morphological change and t-m phase transformation of abraded surface depended on the pressures and size of abrasive particle. Higher pressure and larger size resulted in more extensive morphological change and more frequent t-m phase transformation. Conclusion: The extent of morphological change of ceramic surface depends on the blasting pressures and grain size of airborne particle. Nano-silica particle loosely covered the ceramic surface after air abrasion. The abrasion of the ceramic surface with 50 or 110 mu m alumina airborne particle at pressures of 2.5 or 1.5 bar, respectively, was regarded as the optimum blasting condition. (c) 2012 Elsevier B.V. All rights reserved.
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