Paper Title:
Alumina-Mullite Refractories: Prototypal Components Production for Thermal Shock Tests
  Abstract

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.

  Info
Periodical
Edited by
Pietro VINCENZINI and James P. BENNETT
Pages
53-58
DOI
10.4028/www.scientific.net/AST.70.53
Citation
A. Brentari, M. Labanti, F. Mazzanti, C. Mingazzini, S. Sangiorgi, M. Villa, S. Martelli, D. Olevano, "Alumina-Mullite Refractories: Prototypal Components Production for Thermal Shock Tests", Advances in Science and Technology, Vol. 70, pp. 53-58, 2010
Online since
October 2010
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