DEVELOPMENT OF LIGHTWEIGHT POTTERY USING ORGANIC ANDINORGANIC ADDITIVES
Keywords:
Lightweight, pottery, organic-inorganic pore foaming additives, porous, fracture toughnessAbstract
Organic poly-acrylonitrile hollow microspheres (OHM) and inorganic glass hollow microspheres (GHM) were used as pore-forming additives in a ceramic matrix. After sintering, the densities of the bodies were reduced. A change on the amount and the particle size of the pore-forming additiveswasobserved. A pore membrane created with GHM inhibited the shrinkage in a sintered body. With the decrease in the body density, the water absorption rate increased by as much as 10% due to pore formation. The increase in pore volume of the sintered body results in the decrease in bending strength. A greater decrease in the bending strength and the fracture toughness of the OHM-added body were noted. The OHM decomposed below 500°C and did not influence the crystallization of the body. On the other hand, the GHM increased the amorphous glassy phases and cristobalite peak in the body after sintering. Finally, various pore microstructures were formed due to the size, the amount, and the type of the pore-forming additives.
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