Fabrication of dense β-wollastonite bioceramics by MgSiO3 addition
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Highly dense β-wollastonite (CaSiO3) with good mechanical property and bioactivity was fabricated by pressureless sintering at 1250 ~ 1300 o C and phase transition of α to β-wollastonite with MgSiO3. Starting pure α-wollastonite powder were prepared by solid state reaction, and MgSiO3 powder was added to α-wollastonite powder to induce the phase transition α to β-wollastonite over 1250 o C. Sintered wollastonite at 1250 o C with 5 and 10 wt% MgSiO3 were α + β phase and β phase respectively, and showed higher densification rate than that of α or β-wollastonite, which are almost the same as the theoretical density. Hardness and Young’s modulus of sintered wollastonite were dependent on the apparent density and the amount of β-wollastonite. Young’s modulus (78 GPa) of β-wollastonite added 10 wt% MgSiO3 was almost double time of sintered α-wollastonite. From the in-vitro test, β-wollastonite shows lower bioactivity in SBF solution and better mechanical property than α-wollastonite, and biphasic (α + β) wollastonite with 5 wt% MgSiO3 had good bioactivity in simulated body fluid solution.
Abstract
Highly dense β-wollastonite (CaSiO3) with good mechanical property and bioactivity was fabricated by pressureless sintering at 1250 ~ 1300 o C and phase transition of α to β-wollastonite with MgSiO3. Starting pure α-wollastonite powder were prepared by solid state reaction, and MgSiO3 powder was added to α-wollastonite powder to induce the phase transition α to β-wollastonite over 1250 o C. Sintered wollastonite at 1250 o C with 5 and 10 wt% MgSiO3 were α + β phase and β phase respectively, and showed higher densification rate than that of α or β-wollastonite, which are almost the same as the theoretical density. Hardness and Young’s modulus of sintered wollastonite were dependent on the apparent density and the amount of β-wollastonite. Young’s modulus (78 GPa) of β-wollastonite added 10 wt% MgSiO3 was almost double time of sintered α-wollastonite. From the in-vitro test, β-wollastonite shows lower bioactivity in SBF solution and better mechanical property than α-wollastonite, and biphasic (α + β) wollastonite with 5 wt% MgSiO3 had good bioactivity in simulated body fluid solution.
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