Sintering behavior and physical property of porous wollastonite ceramics on effects of Mg as a trace element

Wollastonite is a natural ore of calcium silicate (-CaSiO 3 ), which is used as a ceramic raw material.In this study, we prepared porous wollastonite ceramics by using American and Mexican wollastonite powders which contain different amounts of Mg as a trace component.We investigated sintering behavior and physical property of these porous ceramics.As a result, it was revealed that when wollastonite contains at least 0.5 mol% of Mg, phase transition temperature from -CaSiO 3 to -CaSiO 3 increased by about 50 °C.Additionally, temperature-dependent phase transition becomes more gradual.This would be due to a phenomenon of "phase transformation" that solid solution of Mg stabilizes -CaSiO 3 during firing.Moreover, such transformation also affects bulk density, porosity and pore structure of porous wollastonite ceramics.