Characterization of Thermochemical and Thermomechanical Properties of Eyjafjallajökull Volcanic Ash Glass
| Autor: | Valerie L. Wiesner, Jonathan A. Salem, Rebekah I. Webster, Elizabeth J. Opila, Narottam P. Bansal |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
crystallization EBCs Thermal expansion law.invention indentation fracture toughness chemistry.chemical_compound Crystallinity law CMAS volcanic ash Materials Chemistry Composite material Crystallization Elastic modulus thermal expansion Surfaces and Interfaces Silicate hardness Surfaces Coatings and Films Amorphous solid chemistry lcsh:TA1-2040 Vickers hardness test viscosity lcsh:Engineering (General). Civil engineering (General) TBCs Volcanic ash |
| Zdroj: | Coatings Volume 10 Issue 2 Coatings, Vol 10, Iss 2, p 100 (2020) |
| ISSN: | 2079-6412 |
| DOI: | 10.3390/coatings10020100 |
| Popis: | The properties of a volcanic ash glass obtained from the Eyjafjallajö kull eruption of 2010 were studied. Crystallization experiments were carried out on bulk and powdered glass samples at temperatures between 900 and 1300 ° C. Iron oxides, Fe3O4 and Fe2O3, and a silicate plagioclase, (Na,Ca)(Si,Al)4O8, were observed. Bulk samples remained mostly amorphous after up to 40 h at temperature. Powdered glass samples showed increased crystallinity after heat treatment compared to bulk samples. The average coefficient of thermal expansion of the glass was 7.00 × 10&minus 6 K&minus 1 over 25&ndash 720 ° C. The Vickers hardness of the glass was 6&ndash 7 GPa and the indentation fracture toughness, 1&ndash 2 MPa &radic m Values for density, elastic modulus, and Poisson&rsquo s ratio were 2.52 g/cm3, 75 GPa, and 0.24, respectively. The viscosity of the glass was determined experimentally and compared to three common models from the literature. The implications for the deposition of volcanic ash on hot section components of aircraft turbine engines are discussed. |
| Databáze: | OpenAIRE |
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