Structure and Properties of Ceramics Based on Monetite and Nanodispersed Silica
| Autor: | Ya. I. Yevich, A. V. Kotlyarchuk, G. B. Tovstonog, O. Ye. Sych, S. O. Ostapenko, N. D. Pinchuk, V. V. Pasichnyi |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Metals and Alloys Mineralogy Sintering Calcium pyrophosphate engineering.material Condensed Matter Physics Wollastonite chemistry.chemical_compound Compressive strength chemistry Chemical engineering Mechanics of Materials visual_art Calcium silicate Materials Chemistry Ceramics and Composites visual_art.visual_art_medium engineering Silicon carbide Ceramic Porosity |
| Zdroj: | Powder Metallurgy and Metal Ceramics. 54:175-182 |
| ISSN: | 1573-9066 1068-1302 |
| Popis: | Calcium–phosphate ceramics based on monetite and nanosized silica are produced by sintering at 500°C. It is established that phase changes and solid-phase reactions occur during sintering to form ceramics that contain β-calcium pyrophosphate (Ca2P2O7), calcium silicate (wollastonite, CaSiO3), and insignificant amount of β-tricalcium phosphate (Ca3(PO4)2). It is shown that the addition of silica inhibits re-crystallization of calcium pyrophosphate into tricalcium phosphate, if compared with ceramics prepared from monetite with no silica added. It is established that increasing the silica content in the starting composition leads to a decrease in the minimum pore size from 0.83 to 0.21 μm. Highly pure nanosized silica (content of SiO2 > 99%) prepared by heat-treating of silicon carbide waste in a solar furnace is used in our research. The porosity of ceramics produced reaches 43.5–46.8% and the compressive strength is 16–24 MPa. |
| Databáze: | OpenAIRE |
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