Effects of Spark Plasma Sintering Process on the Preparation of Wollastonite Glass-ceramics
Single-phase wollastonite microcrystalline glass was prepared by spark plasma sintering technology,with water-quenched glass materials as raw materials.The effects of sintering temperature and pressure on the phase composition,microstructure,and properties of glass-ceramics were studied via X-ray diffractometer(XRD),scanning electron microscope(SEM),and Vickers hardness tester.The research results indicate that an increase in sintering temperature promotes crystallization of glass-ceramics,resulting in increased crystallinity,bulk density,and hardness,while water absorption decreased.An increase in sintering pressure suppresses grain growth in microcrystalline glass,reduces its crystallinity,facilitates eliminating pores,increases bulk density and hardness,and decreases water absorption.The glass-ceramics with the best properties were obtained at a sintering temperature of 900 ℃ and a sintering pressure of 20 MPa,with crystallinity,bulk density,water absorption,and hardness values of 60.60％,2.96 g/cm3,0.009％,and 614 HV,respectively.
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