Book/Dissertation / PhD Thesis

FZJ-2015-07548

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermoschockverhalten und temperaturabhängige Eigenschaften kohlenstoffarmer und -freier Feuerfestwerkstoffe

Böhm, A. (Corresponding author)FZJ*

2016
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-139-2

Please use a persistent id in citations: http://hdl.handle.net/2128/11355

Abstract: Novel developed refractories with reduced carbon content for application in steel industry were investigated regarding to their thermo-mechanical behaviour. Another major part of this work was focused on the development and trial of new/optimization of established test methods (thermal shock by heating via electron beam and wedge splitting test). Al$_{2}$O$_{3}$ with the addition of 2.5 wt.% ZrO$_{2}$ and TiO$_{2}$ respectively (AZT) leads to animproved thermal shock behaviour compared to pure Al$_{2}$O$_{3}$ materials. Temperature dependent investigations revealed a thermal hysteresis of elastic modulus, shear modulus, Poisson's ratio and thermal expansion, accompanied by a phase transformation of ZrO$_{2}$ (monoclinic $\rightarrow$ tetragonal). High temperature (800 - 1000 $^{\circ}$C) wedge splitting tests were performed with optical notch opening determination for Al$_{2}$O$_{3}$ and AZT. The phase transformation of ZrO$_{2}$ leads to a more brittle behaviour of AZT at 800 $^{\circ}$C compared to room temperature. Different loading configurations for the wedge splitting test were tested using Alumina and Al$_{2}$O$_{3}$-C materials in order to apply the test method on small specimen geometries (40 X 40 X 20 mm$^{3}$). Promising results were obtained from a simple approach using two rollers into a grooved sample. With this method, it was possible to determine a constant (sample material independent) friction coefficent ($\mu$ = 0,13). The results showed a good agreement with experimental data obtained from compact tension tests. Thermal shock tests by heating using the electron beam facility JUDITH 1 allowed the application of a well distributed loading pattern on MgO-C Materials. Temperatures up to 1400 $^{\circ}$C at the surface were achieved. The main damage was observed within the MgO grains.

Note: RWTH Aachen, Diss., 2015

---

Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 111 - Efficient and Flexible Power Plants (POF3-111) (POF3-111)
2. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2015

---

Database coverage:
;

---