| Autor: |
Alida Brentari, M. Labanti, Francesca Mazzanti, Sergio Sangiorgi, Daniela Olevano, Matteo Villa, Claudio Mingazzini, Stefano Martelli |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Advances in Science and Technology. |
| ISSN: |
1662-0356 |
| Popis: |
Alumina-mullite refractory tiles are used as liners in gas turbines for power production, for the thermal insulation of the combustion chambers. The typical microstructure is characterized by a coarse fraction, in order to increase porosity (and hence thermal insulation) and improve thermal shock resistance (by grain bridging mechanism). A mixture of alumina and ceramic wastes was optimized to manufacture prototypal components, by cold isostatic press (CIP). On sintering at 1600°C, a final composition of 40% mullite and 60% alumina was obtained. For the production of refractory tiles with dimensions similar to the commercial ones, an appropriate mould was CAD-CAM designed and produced, using aluminium and silicone. 115 x 95 x 30 mm3 tiles were obtained and utilized for thermal shock tests. Samples were heated up to 1000°C and quenched to 20°C: this cycle was repeated 30 times before inspecting the macroscopic cracks. The results were compared with those obtained with a standard test for advanced technical ceramics based on MOR measurements. Two different pressing conditions were tested (60 and 150 MPa) in order to get data about a possible industrial production by uniaxial pressing. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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