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  • 1
    Electronic Resource
    Electronic Resource
    Geometry Effect on the Thermal Shock Response of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/ZrO〈sub〉2〈/sub〉 Multilayered Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 333 (Mar. 2007), p. 251-254 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work, the geometry effect on the thermal shock behaviour of a nine layered Al2O3-5%tZrO2/Al2O3-30%mZrO2 ceramic fabricated by slip casting has been studied. A finite elementmodel has been used to estimate the magnitude and location of the maximum thermal stresses in thelayered material as well as the influence of the variation of this layered architectural design in thethermal shock crack initiation and extend throughout the specimens of study. Experimental tests onvarious samples have been carried out to validate the model. The residual stress distribution profilein the laminate, due to the elastic mismatch of the different layers along with the zirconia phasetransformation on the Al2O3-30%mZrO2 layers, conditions the thermal shock response of thematerial. It is demonstrated how the variation of the outer most layer thickness in the laminatesmodifies the stress state in the surface, affecting the thermal shock crack initiation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.333.251.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Position Resolved Residual Stress Determination in Alumina-Zirconia Multilayered Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 421-425 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Alumina-zirconia multilayered ceramics have been proposed as an alternative for thedesign of structural ceramics with improved fracture toughness and strength reliability. During theprocessing of these laminates, significant residual stresses may arise due to the thermal expansionmismatch between adjacent layers. The correct evaluation of such stress distribution in the laminatemay determine its range of application. In this work, the residual stress state in a layered materialdesigned with five thick alumina layers of approximately 650 microns alternated with four thinalumina-zirconia layers of approximately 140 microns was estimated using different methods. Afinite element analysis (FEM) was performed for stress evaluation in the bulk and an indentationmethod and X-Ray diffraction to account for stresses at the surface. Experimental findings show aconstant stress distribution within the bulk for each layer, while at the surface stress positiondependence is observed in the alumina layers, being the maximum tensile stresses near the layerinterface. The accuracy of the results provided by each technique is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.421.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Residual Stress Profile Determined by Piezo-Spectroscopy in Alumina/Alumina-Zirconia Layers Separated by a Compositionally Graded Intermediate Layer (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 290 (July 2005), p. 328-331 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to understand the mechanical behavior of layered composites with compositional gradient, it is necessary to determine their state of residual stresses. Compositionally graded materials can offer the advantage of eliminating abrupt changes in composition between layers having different thermal expansion coefficients. The existence of a compositional gradient may reduce discontinuities in thermal residual stresses, something beneficial from the point of view of the mechanical properties. We present here a study of the state of the residual stresses in a layered material made of thicker (several mm) homogeneous layers of alumina and alumina-20%zirconia separated by a thinner (less than 300 µm) intermediate graded alumina-zirconia layer, obtained by controlled deposition of powders from a solution using an electrophoretic deposition method. The thermal residual stresses generated during cooling after sintering were measured in thehomogeneous layers at each side, and at steps of about 30 µm in the graded layer along the direction of the compositional gradient, by using fluorescence ruby luminescence piezo-spectroscopy. Results show that the hydrostatic stresses on alumina grains vary continuously, indicating the absence of discontinuities in thermal residual stresses along the compositionally graded layer and at the interfaces of the homogeneous layers
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.290.328.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal Shock Behavior of an Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/ZrO〈sub〉2〈/sub〉 Multilayered Ceramic with Residual Stresses due to Phase Transformations (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 290 (July 2005), p. 191-198 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work, the thermal shock behavior of an Al2O3-5%tZrO2/Al2O3-30%mZrO2multilayer ceramic is studied. On these materials, a tetragonal to monoclinic phase transformation within the Al2O3-30%mZrO2 layers takes place when cooling down from sintering. The latter induces an increase in volume and therefore compressive residual stresses arise in these layers. The residual stress distribution profile in the laminate influences the thermal shock response of the material. A finite element model has been developed to estimate both the thermal strain effects during the sintering process as well as the temperature distribution and stress profile within thelaminate during thermal shock testing. Experimental tests on the monoliths and laminates were carried out and compared to the model. It is observed that the presence of the compressive layers within the laminate inhibits the penetration of thermal shock cracks into the body at even more severe conditions than in the monolithic material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.290.191.pdf
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    Paper (German National Licenses)
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