Effect of grain boundary cracks on the corrosion behaviour of aluminium titanate ceramics in a molten aluminium alloy

Tanaka, Makoto; Kashiwagi, Kazumi; Kawashima, Naoki; Kitaoka, Satoshi; Sakurada, Osamu; Ohya, Yutaka

doi:10.1016/j.corsci.2011.09.002

Cited by 18 publications

(6 citation statements)

References 12 publications

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“…Titanate ceramic refractories for the Al casting industry have been studied and the reaction of the ceramics with an Al alloy was reported. 14,15) These results showed that the actual reactions sometimes cannot be explained by simple thermodynamic considerations.…”

Section: Introductionmentioning

confidence: 99%

Reaction of Molten Aluminum with MgO and Formation of MgAl2O4 Spinel at 1000°C

2020

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The reaction of MgO with molten Al was investigated at 1000°C. When the MgO pellet was heated with Al in an alumina tube, MgAl 2 O 4 spinel formed on both the MgO pellet and the inner surface of the alumina tube. Mg ions were reduced at the interface of the molten Al and MgO pellet, and spinel was formed, although the reaction demonstrated a positive change in the standard Gibbs free energy. The reduced Mg was dissolved in molten Al and reacted at the inner surface of the alumina tube to form the spinel. When Al was melted in the MgO tube, spinel formed at the inner surface of the tube. These reactions can be understood by considering an equilibrium reaction, 4MgO + 2Al MgAl 2 O 4 + 3Mg, with activities of Mg and Al in the metal liquid. The formed spinel was black, which was due to the metal aluminum particles inside the formed spinel layer.

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Section: Introductionmentioning

confidence: 99%

Reaction of Molten Aluminum with MgO and Formation of MgAl2O4 Spinel at 1000°C

2020

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“…AT has a broad spectrum of superb properties: fairly low coefficient of thermal expansion (0.2–1 × 10 −6 K −1 ), 2 ultrahigh thermal shock resistance (up to 500 Wm −1 ), 3 high melting point (≈1860°C), 4 resistance to molten metal, and molten glass; hence these properties enable utilization as high‐temperature structural ceramic candidates such as ceramic components in molten metal casting under quenching and hot conditions, honeycomb ceramic exhaust filters, and catalyst support materials 5–8 . The low thermal expansion coefficient of aluminum titanate is mainly due to microcracks existing within the interior, and the microcracks matrix is triggered by the severe thermal expansion anisotropy of different crystal axes ( α a = −2.9–3.0 × 10 −6 K −1 , α b = 10.3–11.8 × 10 −6 K −1 , α c = 20.1–21.8 × 10 −6 K −1 ) 9 during the cooling stage from sintering temperature, which is in connection with poor mechanical properties 10–12 …”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8] The low thermal expansion coefficient of aluminum titanate is mainly due to microcracks existing within the interior, and the microcracks matrix is triggered by the severe thermal expansion anisotropy of different crystal axes (α a = −2.9-3.0 × 10 −6 K −1 , α b = 10.3-11.8 × 10 −6 K −1 , α c = 20.1-21.8 × 10 −6 K −1 ) 9 during the cooling stage from sintering temperature, which is in connection with poor mechanical properties. [10][11][12] Research investigations were conducted into improving the thermomechanical properties of aluminum titanate ceramics. One is that the incorporation of stabilizers (MgO, Fe 2 O 3 , Y 2 O 3 , La 2 O 3 , etc.)…”

Section: Introductionmentioning

confidence: 99%

Sintering and characterization of aluminum titanate ceramics with enhanced thermomechanical properties

Huang

Song

Chen

et al. 2022

Int J Applied Ceramic Tech

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Aluminum titanate (Al2TiO5) was synthesized from Al2O3‐TiO2 system by solid‐phase reaction with additives of light magnesium carbonate and SiO2, incorporating with silicon carbide (SiC) particle. The influence of additives on the phase composition, microstructure configuration, sintering, and thermomechanical properties of the developed materials was investigated. The experimental results illustrated that the utilization of additives with applicable contents was conducive to the development of complex microstructures. The microstructures characterized by microcracks matrix together with interlocked grains were identified. The samples incorporating SiC and SiO2 simultaneously displayed exceptional densification properties and microstructure as a result of a SiO2 liquid phase accelerating SiC oxidation. Meanwhile, high flexural strength (41.51 MPa) and low thermal expansion coefficient of 0.485 × 10−6 K−1 (RT‐1000 °C) were detected, encouraging refractory applications with high thermomechanical solicitations.

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“…The considerable volume of research on corrosion of metals by molten aluminum can be ascribed to the historical interest in the aluminum industry. In the last decades, the corrosion resistance of a large diversity of materials has been investigated in molten aluminum and its alloys, including iron‐base alloys and cobalt‐base alloys, intermetallics, high entropy alloys, ceramics, and metal/ceramic composites . Because the life span of structural materials under corrosive environment is dependent on the components and thickness of surface intermetallic layer, among the structural materials used in aluminum industry, some refractory metals such as tungsten, titanium, and ceramics/metal composites, particularly in a co‐continuous structure (or a continuous microscopic network of interpenetrating microscopic‐scaled ceramic and metallic phases), exhibit excellent corrosion resistance performance .…”

Section: Introductionmentioning

confidence: 99%

Interfacial reactions of duplex stainless steels with molten aluminum

Zhang

Chen

2015

Surf. Interface Anal.

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The morphology and constitution of the intermetallic layers formed on the surface of duplex stainless steels (DSSs) immersed in molten aluminum at 750 °C for 30 min have been studied in detail by scanning electron microscopy and electron probe micro‐analyzer. Compared with H13 steel, the DSSs exhibited a better corrosion resistance. The weight loss rates, as expressed in terms of weight loss per square centimeter of the specimen per minute, of DSSs are smaller than that of H13. The thickness of the intermetallic layers of DSSs is comparatively thinner. And the interface between the intermetallic layers and DSSs substrate is much flatter. The intermetallic layers of duplex stainless steels are consisted of inner continuous (Fe,Cr)2Al5 phase and outer porous (Fe,Cr)Al3 phases. Microstructure observations suggest that the retarded interfacial reaction between DSSs and molten aluminum is associated with a continuous Al‐Fe‐Cr intermetallic phases layer formed on the solid/liquid interface, which acts as an effective diffusion barrier. The precipitation phase particles distributed along the austenite/ferrite and ferrite/ferrite interfaces also had a good effect on the corrosion resistance properties of DSSs to molten aluminum. Copyright © 2015 John Wiley & Sons, Ltd.

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Effect of grain boundary cracks on the corrosion behaviour of aluminium titanate ceramics in a molten aluminium alloy

Cited by 18 publications

References 12 publications

Reaction of Molten Aluminum with MgO and Formation of MgAl<sub>2</sub>O<sub>4</sub> Spinel at 1000°C

Reaction of Molten Aluminum with MgO and Formation of MgAl<sub>2</sub>O<sub>4</sub> Spinel at 1000°C

Sintering and characterization of aluminum titanate ceramics with enhanced thermomechanical properties

Interfacial reactions of duplex stainless steels with molten aluminum

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