Interfacial reactions in zircon-high alumina cement composites
A study of the interfacial reactions taking place at a zircon-calcium aluminate cement (CA-cement) interface as a function of temperature is presented. The microstructures and morphologies of the interfaces are explained considering the information supplied by the corresponding quaternary phase diagram (ZrO2-Al2O3-SiO2-CaO). The microstructure of the interfacial layers varies strongly with temperature. After 2 h at 1550°C a network of columnar alumina crystals of about 60 μm in length and ≈8 μm in diameter, together with ≈30 μm length a CA6 needle-like crystals are embedded in an anorthite rich matrix. At 1600°C only a glassy phase with alumina crystals is observed at the interface. For the sample treated at 1550°C, cracks are deflected at the interface due to the presence of alumina crystals, whereas at 1600°C the cracks propagate through the interface without any deflection.
| Main Authors: | , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Elsevier
1998
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| Online Access: | http://hdl.handle.net/10261/223265 http://dx.doi.org/10.13039/501100007273 |
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| Summary: | A study of the interfacial reactions taking place at a zircon-calcium aluminate cement (CA-cement) interface as a function of temperature is presented. The microstructures and morphologies of the interfaces are explained considering the information supplied by the corresponding quaternary phase diagram (ZrO2-Al2O3-SiO2-CaO). The microstructure of the interfacial layers varies strongly with temperature. After 2 h at 1550°C a network of columnar alumina crystals of about 60 μm in length and ≈8 μm in diameter, together with ≈30 μm length a CA6 needle-like crystals are embedded in an anorthite rich matrix. At 1600°C only a glassy phase with alumina crystals is observed at the interface. For the sample treated at 1550°C, cracks are deflected at the interface due to the presence of alumina crystals, whereas at 1600°C the cracks propagate through the interface without any deflection. |
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