Materials in the CaO-K[sub.2]O-SO[sub.3]-H[sub.2]O System Based on Powder Mixtures including Calciolangbeinite K[sub.2]Ca[sub.2][sub.3] and Calcium Sulfate Anhydrite CaSO[sub.4]

Materials (cement stone samples) in the CaO-K[sub.2]O-SO[sub.3]-H[sub.2]O system with the target phase compositions, including syngenite K[sub.2]Ca(SO[sub.4])[sub.2]·H[sub.2]O and calcium sulfate dihydrate CaSO[sub.4]·2H[sub.2]O, were prepared from powder mixtures of calcium sulfate anhydrite CaSO[s...

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Veröffentlicht in:Ceramics 2023-07, Vol.6 (3)
Hauptverfasser: Kuznetsov, Alexander I, Safronova, Tatiana V, Shatalova, Tatiana B, Filippov, Yaroslav Y, Vaymugin, Leonid A, Vlasenko, Vyacheslav S, Likhanov, Maxim S
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Sprache:eng
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Zusammenfassung:Materials (cement stone samples) in the CaO-K[sub.2]O-SO[sub.3]-H[sub.2]O system with the target phase compositions, including syngenite K[sub.2]Ca(SO[sub.4])[sub.2]·H[sub.2]O and calcium sulfate dihydrate CaSO[sub.4]·2H[sub.2]O, were prepared from powder mixtures of calcium sulfate anhydrite CaSO[sub.4], and/or calciolangbeinite K[sub.2]Ca[sub.2](SO[sub.4])[sub.3], and potassium sulfate K[sub.2]SO[sub.4] via hydration reactions at a water/powder ratio within an interval of 0.5–0.9. It was revealed that samples with contents of 25, 50, 75 and 100 mol% of syngenite K[sub.2]Ca(SO[sub.4])[sub.2]·H[sub.2]O demonstrated a nonlinear dependence of their respective microstructures on their phase compositions. The microstructures of samples with phase compositions of 25 and 75 mol% of syngenite K[sub.2]Ca(SO[sub.4])[sub.2]·H[sub.2]O consisted of pillar crystals. The microstructures of samples with phase compositions of 50 and 100 mol% of syngenite K[sub.2]Ca(SO[sub.4])[sub.2]·H[sub.2]O consisted of plate crystals. An explanation of microstructure formation was set forth, taking into account equilibria of the dissolution–crystallization processes during cement stone formation. Materials obtained in the CaO-K[sub.2]O-SO[sub.3]-H[sub.2]O system consisting of biocompatible and resorbable (soluble in water) phases can be recommended for testing as potential substances for bone defect treatments.
ISSN:2571-6131
2571-6131
DOI:10.3390/ceramics6030088