Corrosion of ceramic materials

Sudha, Priya; Sangeetha, K.; Kumari, Aarti; Vanisri, N.; Rani, K. Anitha

doi:10.1016/b978-0-08-102203-0.00009-3

Cited by 16 publications

(12 citation statements)

References 81 publications

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“…There are two practical ways of avoiding the corrosion of refractory materials that are in direct contact with molten Al alloys: Chemical means, by the addition of non-wetting additives (NWA) as components of the refractory materials [ 71 ]; and Physical means, through surface modification and densification by, for example, creating a protective coating on the surface of the refractory, which comes in direct contact with the molten alloy [ 40 ]. …”

Section: Corrosion Of Refractories In Al Industrymentioning

confidence: 99%

“…Chemical means, by the addition of non-wetting additives (NWA) as components of the refractory materials [ 71 ]; and…”

Section: Corrosion Of Refractories In Al Industrymentioning

confidence: 99%

“…Mullite can be added to the initial refractory paste or generated in situ during firing, which intrinsically creates different microstructure from that formed by mullite when added initially [ 37 ]. It has been observed that the presence of mullite minimizes the corrosion of alumina refractories [ 71 ].…”

Section: Corrosion Of Refractories In Al Industrymentioning

confidence: 99%

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Improving Corrosion Resistance of Aluminosilicate Refractories towards Molten Al-Mg Alloy Using Non-Wetting Additives: A Short Review

et al. 2020

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The corrosion of refractories in contact with high temperature aluminum-magnesium alloys leads to contamination of the Al-Mg alloy products by solid impurities from degraded refractories. Where both the spinel and corundum phases form in the refractories, cracks are generated and propagated by diffusion of molten Al-Mg, resulting in severe corrosion. In this review paper, the corrosion phenomenon is discussed, and published work is summarized, supplemented by our recent experimental results. Using the Alcan immersion test, materials based on white-fused mullite (WFM) were evaluated for their corrosion resistance and interfacial behavior. WFM was modified using different 2-wt.% of non-wetting additives (NWAs), such as BaSO4, CaF2, Secar®71 cement and wollastonite to improve their performance when in contact with molten Al-Mg alloy at 850 °C for 96 h. The mechanical properties of the samples such as flexural and compressive strength were evaluated, in addition to X-ray diffraction and microscopic analysis (optical and scanning electron microscopy coupled with X-ray elemental mapping). It was observed that cracks formed in samples were promoted with only BaSO4, CaF2, Secar®71 cement or wollastonite. However, cracks did not appear in the sample promoted with both 1-wt.% CaF2 and 1-wt.% BaSO4, because of improved anti-wetting properties in addition to inhibiting spinel (MgAl2O4) formation, which is the main cause of the cracks. This is a significant finding in the prevention of cracks and improvement of the refractory corrosion resistance.

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Section: Corrosion Of Refractories In Al Industrymentioning

confidence: 99%

“…Chemical means, by the addition of non-wetting additives (NWA) as components of the refractory materials [ 71 ]; and…”

Section: Corrosion Of Refractories In Al Industrymentioning

confidence: 99%

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Improving Corrosion Resistance of Aluminosilicate Refractories towards Molten Al-Mg Alloy Using Non-Wetting Additives: A Short Review

et al. 2020

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“…Ceramics have good flow resistance, high chemical and physical stability, high temperature resistance, high compressive strength, high hardness and high melt temperature, which give them significant technological applications. Ceramic materials can be classified as ceramic silicates, non-oxide ceramics and ceramic oxides (metal oxides) [16].…”

Section: Fundamentals Of Metal Oxide Semiconductorsmentioning

confidence: 99%

Metal Oxide Heteronanostructures Prepared by Electrospinning for the Humidity Detection: Fundamentals and Perspectives

Leão¹,

Araújo²

2019

MSCE

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Humidity is a critical environmental parameter for several production processes and its control/monitoring is of great importance in maintaining the quality of goods and products. In this context, metallic oxide ceramic nanostructures are materials of great technological interest in the fabrication of moisture sensors because they have good chemical/structural stability and high surface area/volume ratio. The electrical response of these sensors relates to the chemisorbed and physisorbed layers of water molecules on the surface of the ceramic particles and to the capillary condensation of water in the microscopic pores between the particles. Based on these aspects, this work presents the fundamentals, electrical/electronic properties, influence of dopants, novel preparation procedure by electrospinning and perspectives of application of TiO 2 :WO 3 metal oxide heteronanostructures as humidity sensors.

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“…The later corroded preferentially by the temperature-dependent dissolution of the aluminosilicate grain boundary phase in conjunction with the precipitation of silicaceous phases. Additionally, the corrosion of Al 2 O 3 with additives was reported to be three orders faster as compared to polycrystalline Al 2 O 3 [23,24]. The addition of second phase nanoparticles such as SiC to Al 2 O 3 can significantly improve functional performance.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Effect of Ultrafine SiC Additions on Corrosion and Wear Performance of Alumina-Silicon Carbide Composite Material Produced by SPS Sintering

Mogale

Matizamhuka

2020

Metals

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Alumina-silicon carbide (Al2O3–SiC) composites of varying compositions (15, 20, 25 and 30 vol.%)–SiC were produced by the ball milling of Al2O3 and SiC powders, followed by spark plasma sintering. The samples were sintered at a temperature and pressure of 1600 °C and 50 MPa, respectively, thermally etched at 1400 °C and mechanically fractured by hammer impact. The effect of SiC additions to monolithic Al2O3 on the densification response, microstructural and phase evolutions, and fracture morphologies were evaluated. The wear performance of the composites using a ball-on-sample configuration was evaluated and compared to that of monolithic Al2O3. In addition, the corrosion performance of the composites in a 3.5% NaCl solution was examined using open circuit potential and potentiodynamic polarization assessments. SiC additions to monolithic Al2O3 delayed densification due to the powder agglomeration resulting from the powder processing. SiC particles were observed to be located inside Al2O3 grains and some at grain boundaries. Intergranular and transgranular fracture modes were observed on the fractured composite surfaces. The study has shown that the Al2O3–SiC composite is a promising material for improved wear resistance with SiC content increments higher than 15 vol.%. Moreover, the increase in SiC content displayed no improvement in corrosion performance.

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Corrosion of ceramic materials

Cited by 16 publications

References 81 publications

Improving Corrosion Resistance of Aluminosilicate Refractories towards Molten Al-Mg Alloy Using Non-Wetting Additives: A Short Review

Improving Corrosion Resistance of Aluminosilicate Refractories towards Molten Al-Mg Alloy Using Non-Wetting Additives: A Short Review

Metal Oxide Heteronanostructures Prepared by Electrospinning for the Humidity Detection: Fundamentals and Perspectives

A Study on the Effect of Ultrafine SiC Additions on Corrosion and Wear Performance of Alumina-Silicon Carbide Composite Material Produced by SPS Sintering

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