The preparation of AI2O3/Ni composites by a powder coating technique

Tuan, Wei‐Hsing; Wu, Hongya; Yang, Tzong Jer

doi:10.1007/bf01178417

Cited by 70 publications

(34 citation statements)

References 12 publications

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“…Composites with the nickel aluminate phase (NiAl 2 O 4 ) are also used as catalysts or precatalysts for steam reforming or as electrode materials in high-temperature fuel cells due to their unusual conductivity [4]. Composites with nickel aluminate phase can be prepared by several methods, such as a powder technique [5], sol-gel method [6][7][8][9], wet chemical methods such as hydrothermal and solvothermal methods [10], powder coating process [11], conventional impregnation solid-state reaction [12]. The formation of the spinel depends on many factors, e.g., time, temperature, starting substrates used in the process, and it is not still fully described.…”

Section: Introductionmentioning

confidence: 99%

Characterization of composites containing NiAl2O4 spinel phase from Al2O3/NiO and Al2O3/Ni systems

Zygmuntowicz

Wiecińska

Miazga

et al. 2016

J Therm Anal Calorim

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This paper focused on the characterization of the composites containing nickel aluminate spinel from Al 2 O 3 /NiO and Al 2 O 3 /Ni systems. The composites were prepared by die pressing of powders and subsequent sintering of green bodies in air atmosphere. Composites were characterized by XRD, SEM, EDS and DTA/TG/MS analyses. The physical properties of the composites were measured by Archimedes method. Quantitative description of the composites microstructure was made on the basis of SEM images using computer image analysis. The XRD studies and SEM observations of composites confirmed the presence of two phases Al 2 O 3 and NiAl 2 O 4 in the whole volume of samples from both systems. Spinel phase was evenly distributed throughout the volume of the material. Morphology of NiAl 2 O 4 obtained from both systems was characterized by the presence of voids. The DTA/TG/MS measurements showed the characteristics of organic binder decomposition and type of gases released to the atmosphere during thermal treatment. Moreover, the DTA/TG analysis showed the temperature of spinel-phase formation for both systems. It was found that the spinel-phase NiAl 2 O 4 formation retards the process of densification. Therefore, it can be concluded that densification of samples with spinel phase depends mainly on the volume of spinel phase in composite material and does not depend on the substrates used to prepare spinel phase. The values of the selected properties of Al 2 O 3 -Ni-and Al 2 O 3 -NiO-based materials confirmed that the physical properties depend on the type of substrates used in the fabrication of composites. The type of powder influences the open porosity of samples. For composites produced using NiO powder, open porosity is lower than for samples formed with nickel powder.

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Section: Introductionmentioning

confidence: 99%

Characterization of composites containing NiAl2O4 spinel phase from Al2O3/NiO and Al2O3/Ni systems

Zygmuntowicz

Wiecińska

Miazga

et al. 2016

J Therm Anal Calorim

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“…This method has introduced to prepare ceramic/metal nanocomposites with fine and homogeneous dispersion [15,16]. The effects of silver on microstructure and dielectric properties of BiT are investigated.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dielectric properties of bismuth titanate/silver composites

Xiang

Kinemuchi

2006

J Electroceram

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Bismuth titanate (BiT) based composites containing silver particles are fabricated by a solution chemical process. Incorporation of silver particles does not result in unwanted reaction phase. SEM micrographs reveal fine silver particles distribute at BiT grain boundaries and into larger BiT plate-like grains. With the addition of silver, the dielectric constant increases up to ∼10 times higher than that of pure BiT ceramic, which can be attributed to the effective electric fields developed around the dispersed metal particles and the percolation effect. Additionally, the dielectric losses are significantly reduced by incorporating silver particles, and the values of BiT/Ag composites are lower than 0.5%. The dielectric properties of BiT/Ag composites are nearly frequency independent in the measured frequency range (1 kHz to 1 MHz).

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“…The enhancement of toughness is attribute to a crack bridging and de ection mechanism. 1,2) If the ductile phase is weekly bonded to the ceramics, the crack will propagate along the interface, and the contribution from ductility to the toughening enhancement will be negligible. Al 2 O 3 has a density of 3.98 g/cm 3 , a Young s modulus of 380 GPa, excellent oxidation resistance and good high-temperature mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mechanical Properties of Nanostructured 2.25CoAl-Al<sub>2</sub>O<sub>3</sub> Composite Sintered by Pulsed Current Activated Heating

2016

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The nanopowders of CoAl and Al 2 O 3 were synthesized from Co 3 O 4 and Al powders using high energy ball milling. The nanostructured 2.25CoAl-Al 2 O 3 composite from the milled powder was consolidated within two min by the pulsed current activated sintering. The mechanical properties and microstucture of the nanostructured 2.25CoAl-Al 2 O 3 was investigated from the view points of using Vickers hardness measurement, X-ray diffraction analysis and FE-SEM observation.

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The preparation of AI2O3/Ni composites by a powder coating technique

Cited by 70 publications

References 12 publications

Characterization of composites containing NiAl2O4 spinel phase from Al2O3/NiO and Al2O3/Ni systems

Characterization of composites containing NiAl2O4 spinel phase from Al2O3/NiO and Al2O3/Ni systems

Enhanced dielectric properties of bismuth titanate/silver composites

Enhanced Mechanical Properties of Nanostructured 2.25CoAl-Al<sub>2</sub>O<sub>3</sub> Composite Sintered by Pulsed Current Activated Heating

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