Phase transition and surface hardness improvement of zirconia by hydroxyapatite and β-tricalciumphosphate powder bed sintering
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To improve the surface hardness of zirconia using a phase transition, bed sintering was conducted on 3mol% Y2O3-tetragonalzirconia polycrystal (3Y-TZP) embedded in hydroxyapatite (HA) powder and β-tricalciumphosphate (β-TCP) powder at1450oC for different times. HA and TCP were decomposed to CaO, which is one of the stabilizers of zirconia at 1400 oC. Various properties of the specimens were analyzed. X-ray diffraction showed that CaO had diffused into ZrO2 and induceda tetragonal to cubic phase transition during the sintering process. At the same time, the zirconia pellet was densified duringthe sintering process. The microstructure of zirconia indicated that the thickness of the cubic phase at the surface increasedwith increasing sintering time. As a result, the Vickers hardness of the specimens processed by powder bed sintering washigher than that of the untreated specimen due to the formation of a cubic phase.
Abstract
To improve the surface hardness of zirconia using a phase transition, bed sintering was conducted on 3mol% Y2O3-tetragonalzirconia polycrystal (3Y-TZP) embedded in hydroxyapatite (HA) powder and β-tricalciumphosphate (β-TCP) powder at1450oC for different times. HA and TCP were decomposed to CaO, which is one of the stabilizers of zirconia at 1400 oC. Various properties of the specimens were analyzed. X-ray diffraction showed that CaO had diffused into ZrO2 and induceda tetragonal to cubic phase transition during the sintering process. At the same time, the zirconia pellet was densified duringthe sintering process. The microstructure of zirconia indicated that the thickness of the cubic phase at the surface increasedwith increasing sintering time. As a result, the Vickers hardness of the specimens processed by powder bed sintering washigher than that of the untreated specimen due to the formation of a cubic phase.
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