Abstract
Porous ceramic, whose composition is mainly represented by calcium β-pyrophosphate β-Ca2P2O7, is prepared from a porous mixture containing synthetic calcium γ-pyrophosphate γ-Ca2P2O7 and milled 1-aqueous sodium dihydrophosphate in an amount from 2.5 to 40 wt.%. Ceramic sintering proceeds by a liquid-phase sintering mechanism due to melt formation in the system Na2O–CaO–P2O5. Ceramic microstructure after firing in the range 800 – 1000°C makes it possible to consider sodium polyphosphate not only as a component facilitating sintering by a liquid-phase mechanism, but also as an inorganic pore-forming agent.
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