Design of alumina-zirconia composites with spatially tailored strength and toughness

Chang, Yunfei; Bermejo, Raúl; Ševeček, Oldřich; Messing, Gary L.

doi:10.1016/j.jeurceramsoc.2014.09.017

Cited by 25 publications

(15 citation statements)

References 33 publications

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“…Of note, despite various multilayered ceramics having been developed, few studies have focused on the use of metals as the interlayer. Therefore, the striking results presented herein will provide a new research pathway for laminated ceramics …”

Section: Resultsmentioning

confidence: 74%

Strong and tough ZrB₂ materials using a heterogeneous ceramic–metal layered architecture

Bai

Sun

et al. 2019

J Am Ceram Soc

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ZrB2‐SiCw ceramic sheets produced by tape casting and tailored ductile Ti foil were alternatively stacked and sintered by spark plasma to synthesize a multi‐layered ceramic. Following mechanical processing, a high flexural strength (621 MPa) and fracture toughness (15.3 MPa·m1/2) in uniaxial tension were achieved in comparison to laminated ceramics with a weak BN interlayer. Scanning and transmission electron microscopy revealed a characteristic macroscopic heterogeneous lamella as well as a three‐tier microstructured interface, termed the L‐T structure. This novel structure provides a new path for the development of ceramic/metal layered composites with superior mechanical properties in the near future.

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Section: Resultsmentioning

confidence: 74%

Strong and tough ZrB₂ materials using a heterogeneous ceramic–metal layered architecture

Bai

Sun

et al. 2019

J Am Ceram Soc

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“…Therefore, the mismatch of the thermal expansion coefficients of different compositions would result in the generation of tensile residual stress in the Al 2 O 3 layer and compressive residual stress in the Al 2 O 3 –graphite layers when the sintered samples were cooled down to room temperature. As the Al 2 O 3 –graphite layer always lays on the surface of the laminated structure, the in–plane compressive residual stress in the surface layer can effective shield the initiation of cracks and result in a higher fracture resistance, leading to the strength improvement of the Al 2 O 3 /Al 2 O 3 –graphite laminated composites …”

Section: Resultsmentioning

confidence: 99%

“…Considering a homogeneous and biaxial residual stress state in the interior of the layers in a laminated composite, the residual stress ( σ res, i ) in i th layer can be analytically calculated as follows,

σ_{res, i} = \frac{E_{i}}{1 - ν_{i}} false(\bar{α} - α_{i} false) Δ T,

where E i , ν i , and α i are the elastic modulus, Poisson's ratio, and thermal expansion coefficient of the i th layer, respectively. The elastic modulus of Al 2 O 3 and graphite are 375 and 10 GPa, and the Poisson's ratios are 0.26 and 0.17, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…

\overset{α}{true}

is the average thermal expansion coefficient of the laminated composite. For a laminated composite consisting of A (Al 2 O 3 ) and B (Al 2 O 3 –graphite) materials, with each material having the same thickness for each layer,

\overset{α}{true}

of the composite can be calculated by:

\bar{α} = \frac{()(, \frac{n_{A} E_{A} α_{A}}{1 - ν_{A}} + \frac{n_{B} E_{B} α_{B}}{1 - ν_{B}})}{()(, \frac{n_{A} E_{A}}{1 - ν_{A}} + \frac{n_{B} E_{B}}{1 - ν_{B}})},

where n A and n B are the numbers of A and B layers, respectively. The change in temperature is Δ T = −1380 K using Equation , the residual stresses in both the Al 2 O 3 and Al 2 O 3 –graphite layers were calculated, as listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Previous research demonstrated that the compressive stress shields the materials against propagating flaws, while the tensile stress has a detrimental effect in the bending strength and apparent fracture toughness . Design this type of materials with a small thickness of layers could significantly improve the compressive stress in the Al 2 O 3 ‐graphite layers and decrease the tensile residual stress in the Al 2 O 3 layers, and thereby increasing the shielding effect by the compressive layers and avoiding the occurrence of the damages such as tunneling cracks, thus enhancing the fracture resistance and bending strength of the laminated composites . However, if the thickness of the compressive layer is too small, no large crack arrest or crack deflection may take place, thus resulting in a decrease in the toughness and work of fracture, as demonstrated by the samples AG9 and AG11 in Figure .…”

Section: Resultsmentioning

confidence: 99%

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Enhanced thermal shock response of Al₂O₃–graphite composites through a layered architectural design

et al. 2018

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The use of ceramics such as alumina in moving components often requires the addition of low friction materials such as graphite. A new strategy for improving toughness, strength, and thermal‐shock resistance of Al2O3–graphite self‐lubricating composites was proposed in this study. Alumina layers embedded between Al2O3–graphite layers were fabricated and tested after thermal shock conditions ranging between 500 °C and 800 °C maximum temperature. Retained strength and apparent fracture toughness after the tests were compared to room temperature values. Results show that compressive residual stresses generated in the outer Al2O3–graphite layers during cooling down from sintering improve the failure resistance of the materials. The introduction of heat‐resistant particles (Al2O3 particles) into graphite layers combined with a layered architecture can greatly decrease the oxidation degradation of the materials below 500 °C. In addition, the retained strength and toughness in the layered architectures after thermal shock between 550 °C and 800 °C remains constant, thus indicating that the new‐developed Al2O3/Al2O3–graphite laminated composites may be reliable candidates for self–lubricating applications also for elevated temperatures.

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Hierarchical Architectures to Enhance Structural and Functional Properties of Brittle Materials

et al. 2016

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This paper reviews current activities at the Montanuniversität Leoben on the hierarchical design of flaw-tolerant brittle materials in the fields of layered ceramics, hard coatings, fibre reinforced laminates, and biomimetic functional systems. Different examples of reinforcement mechanisms are presented acting at different length scales. Novel strategies are analyzed that make use of tailored residual stresses, textured microstructures, compositional heterogeneity and spatial variations in properties, fiber arrangement and laminate stacking, or functionalization of hierarchical materials from brittle constituents. Potential implications of hierarchical structures combining different materials science approaches for future engineering designs are discussed.

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Design of alumina-zirconia composites with spatially tailored strength and toughness

Cited by 25 publications

References 33 publications

Strong and tough ZrB₂ materials using a heterogeneous ceramic–metal layered architecture

Strong and tough ZrB₂ materials using a heterogeneous ceramic–metal layered architecture

Enhanced thermal shock response of Al₂O₃–graphite composites through a layered architectural design

Hierarchical Architectures to Enhance Structural and Functional Properties of Brittle Materials

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Design of alumina-zirconia composites with spatially tailored strength and toughness

Cited by 25 publications

References 33 publications

Strong and tough ZrB2 materials using a heterogeneous ceramic–metal layered architecture

Strong and tough ZrB2 materials using a heterogeneous ceramic–metal layered architecture

Enhanced thermal shock response of Al2O3–graphite composites through a layered architectural design

Hierarchical Architectures to Enhance Structural and Functional Properties of Brittle Materials

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Strong and tough ZrB₂ materials using a heterogeneous ceramic–metal layered architecture

Strong and tough ZrB₂ materials using a heterogeneous ceramic–metal layered architecture

Enhanced thermal shock response of Al₂O₃–graphite composites through a layered architectural design