Introduction the World of Oxide Nanomaterials

Rodríguez, José Antonio; Fernández, M.

doi:10.1002/9780470108970.ch

Cited by 41 publications

(51 citation statements)

References 44 publications

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“…On the other hand, because the AT05-CNFs had a larger amount of defect than the HDT-CNFs, it was not easy for the AT05-CNFs to migrate rapidly on the alumina grain boundaries. That is, the AT05-CNFs moved along with boundaries with the CNFs mobility controlling the boundary velocity, which is corresponding to above (2). So the AT05-CNFs were distributed at intergranular even at higher temperatures and did give a larger grain growth retardation effect to the alumina grain growth, as shown in Fig.…”

Section: Microstructure Development Of Compositesmentioning

confidence: 73%

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

Ueda

Yamakami

Yamaguchi

et al. 2012

J. Ceram. Soc. Japan

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In this study, carbon nanofibers (CNFs) having different amounts of defect were prepared by acid-treating for 0.5, 1 and 5 h and were combined with alumina. Then, the influence of the amount of defect on the CNFs on microstructure development of the CNFs/alumina composites and relationship between the fracture toughness and the average alumina grain size was investigated. The intensity ratio of D-band to G-band (D/G) in Raman spectra of the CNFs increased from 0.34 for pristine CNFs to 0.95 for the CNFs acid-treated for 5 h with the acid-treatment time, which indicates that the amount of defect on the CNFs increased with the acid-treatment time. The alumina grain growth in the dense composites sintered at 12001300°C was not influenced by the amount of defect on the CNFs, however, the composite containing CNFs having the moderate amount of defect (D/G = 0.56) showed the slowest alumina grain growth rate at 13501450°C. The fracture toughness of the composites containing the CNFs acid-treated for 0.5 h increased with a decrease in average alumina grain size and reached 5.6 MPa·m 0.5 at the average alumina grain size of 0.84¯m, which was 60% higher value compared to monolithic alumina (3.5 MPa·m 0.5 ). However, fracture toughness of the composites containing CNFs acid-treated for 1 and 5 h increased with a decrease in average alumina grain size, showed the maximum values of 5.0 and 4.5 MPa·m 0.5 at average alumina grain sizes of 1.3 and 1.6¯m, respectively, and decreased as the average alumina grain size decreased further. The maximum fracture toughness of the composite containing the CNFs acidtreated for 5 h was lower than that of the composite containing the CNFs acid-treated for 1 h.

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Section: Microstructure Development Of Compositesmentioning

confidence: 73%

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

Ueda

Yamakami

Yamaguchi

et al. 2012

J. Ceram. Soc. Japan

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“…Data was taken for the 2θ range of 5 to 90 degrees with a step of 0.013 degree. (113), (202), (024), (116), (018), (214) and (1010) planes of aluminum oxide were observed and compared with the standard powder diffraction [8][9][10][11][12]. For studied samples the preferential orientation value of (104) plane has the highest value compared to other planes.…”

Section: X-ray Diffraction Study Of Aluminum Oxide (Al 2 O 3 )mentioning

confidence: 97%

“…X-ray diffraction is one of the most important characterization tools used in solid state chemistry and materials science [7][8][9][10][11][12][13]. XRD is an easy tool to determine the size and the shape of the unit cell for any compound.…”

Section: X-ray Diffraction Study Of Aluminum Oxide (Al 2 O 3 )mentioning

confidence: 99%

“…Alumina (Al 2 O 3 ) shows excellent physical and chemical properties, including the highest strength among oxides, excellent abrasion resistance, heat resistance, a high dielectric strength at high voltage, and high resistance to chemical attack [9][10][11]. X-ray diffraction is one of the most powerful tools for identifying unknown crystalline phases [14].…”

Section: Introductionmentioning

confidence: 99%

“…The powder metallurgy route for manufacturing composites materials offers some advantages compared with ingot metallurgy or diffusion welding, Alumina powder is a commonly used raw material in support preparation processes [2][3][4]. Al 2 O 3 is the most stable type among various crystal phases because of its high lattice energy, high hardness, hard ground, and easy agglomeration [6][7][8][9][10][11][12][13][14][15]. The crystalline phase and average crystallite size of the powder were determined by X-ray diffraction (XRD) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of the Difference Time Grinding on the Structure and Morphology of Aluminum Oxide (Al<sub>2</sub>O<sub>3</sub>)

Omar

Boulevard²,

Koy³

2015

ILCPA

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ABSTRACT. The objective of the paper has been given on the observations based on the studies on aluminum oxide (Al 2 O 3 ) powder or alumina for different time grinding. A discussion about simple and low cost preparation of Al 2 O 3 powder by (Mini Mill 2 Panalytical) and preparation of the sample was rotating at 0, 5,10 and 15 min and in the case of grinding of samples at high speed 659 rpm. Structure and morphology of aluminum oxide (Al 2 O 3 ) powder its characterizations (XRD (Model: Panalytical Empyrean) and STM (Model: NTMDT Solver Nano.)) are studied in this research paper.

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Universal Block Copolymer Lithography for Metals, Semiconductors, Ceramics, and Polymers

et al. 2008

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Introduction the World of Oxide Nanomaterials

Cited by 41 publications

References 44 publications

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

The Effect of the Difference Time Grinding on the Structure and Morphology of Aluminum Oxide (Al<sub>2</sub>O<sub>3</sub>)

Universal Block Copolymer Lithography for Metals, Semiconductors, Ceramics, and Polymers

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