High-Temperature Mechanical Characterisation of In-Situ Forming Spinel-Alumina Castables Using Magnesia or Magnesite as Raw Material

N. Preux1, C. Dannert2, F. Holleyn3, V. Lardot4, O. Krause5, F. Cambier6, P. Pilate6, E. Brochen7

1 BCRC – Belgian Ceramic Research Centre, (Member of EMR), 7000 Mons/Belgium
2 FGF Forschungsgemeinschaft Feuerfest e. V., 56203 Höhr-Grenzhausen/Germany
3 Hochschule Koblenz, 56203 Höhr-Grenzhausen/Germany
4 BCRC – Belgian Ceramic Research Centre, (Member of EMR), 7000 Mons/Belgium
5 Hochschule Koblenz, 56203 Höhr-Grenzhausen/Germany
6 BCRC – Belgian Ceramic Research Centre, (Member of EMR), 7000 Mons/Belgium
7 FGF Forschungsgemeinschaft Feuerfest e. V., 56203 Höhr-Grenzhausen/Germany

Revision 30.07.2018, 25.10.2018

Volume 11, Issue 1, Pages 82 - 87

Abstract

In this work, four alumina-magnesia, cement-bonded castables were tested at high temperature. Strength was determined by bending test at temperature ranging from room temperature to 1550 °C. As a reference, a high alumina castable was also investigated. The effect of several parameters: composition, addition of magnesia or magnesite (carbonate) and microsilica addition were investigated. Strength-displacement curves were also recorded during the tests. Microscopic observation and XR diffraction were also introduced to support the discussion and conclusions of the work. Results demonstrate the effect of some parameters on high temperature mechanical behaviour: sintering, phase transformations and liquid phase appearance vs. temperature.

Keywords

temperature, strength, castable, spinel, alumina

References

[1] da Luz, A.P.; Braulio, M.A.L.; Pandolfelli, V.C.: Refractory castable engineering. Fire Compendium Series, Baden-Baden 2015, 497– 592 [2] Holleyn, F.; et al.: Spinel yield using magnesium oxide and magnesite in alumina based refractory monolithic. Proc. of 59 Int. Coll. On Refractories, Aachen, Germany (2016) 109–111 [3] EN 993-7, Methods of test for dense shaped refractory products, determination of modulus of rupture at elevated temperatures, standard test measurement, CEN Bruxelles, 2000 [4] Deletter, M.; Leriche, A.; Cambier, F.: A linear model for both qualitative and quantitative X-ray analysis. Sil. Industr. 57 (1992) [1–2] 3–8 [5] Bröchen, E.; et al.: How does the spinel formation improve the fexibility of spinel forming alumina castables at elevated temperature. Proc. of 59th Int. Coll. on Refractories, Aachen, Germany (2016) 112–116 [6] Preux, N.; et al.: Development of a fractography method to investigate the crack path, induced during wedge splitting test of alumina-spinel castables. Proc. of 60th Int. Coll. on Refractories, Aachen, Germany (2017) [7] Bradt, R.C.: Fracture of refractories. In: Refractories Handbook, ed. by C.A. Schacht. New York, Basel 2004, 11–3 [8] Preux, N.; et al.: Computer aided method for the characterisation of refractory castables microstructure. Proc. of Unifed Int. Technical Conf. on Refractories (UNITECR), Santiago, Chile (2017)

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