Synthesis of Ca-α SiAlON using Zeolite as a Raw Material

Ca-α SiAlON powders were synthesized by carbothermal reduction nitridation (CRN) of zeolite (Ca-zeolite Y). First, the Ca-zeolite Y was converted into an amorphous phase below 1100°C, and then into Ca-α SiAlON via mullite, Si2N2O and (Ca, Si, Al)xOy liquid at 1450°C. In converting zeolite into Ca-α SiAlON, it was found that Ca-α SiAlON particles were of a similar size to that of the raw material, indicating that it is possible to control the particle size of Ca-α SiAlON using zeolite as a raw material.