Effect of high energy ball milling on compressibility and sintering behavior of alumina nanoparticles

Eskandari, A.; Aminzare, M.; Hesabi, Z. Razavi; Aboutalebi, Seyed Hamed; Sadrnezhaad, S.K.

doi:10.1016/j.ceramint.2011.12.012

Cited by 31 publications

(19 citation statements)

References 22 publications

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“…3(a). Although dry pressing methods generally introduce pores and voids into green bodies, subsequently degrading the densification of conventional ceramics, 27) due to the highly porous microstructure of the diatomite matrix, it was difficult to find peculiar voids or pores in the sintered diatomite membrane prepared by dry pressing. The densities of diatomite membrane were dependent on the amount and the kind of sacrificial template addition, and were varied from 0.8 to 1.0 g/cm As the average particle size of diatomite, which was ball-milled for 24 h, was 8.36¯m, the diatomite membrane had more distinct spherical pores in the diatomite matrix when prepared with the 20¯m solid polymer spheres as compared to the 8¯m solid polymer spheres.…”

Section: Resultsmentioning

confidence: 99%

The effect of sacrificial templates on the pore characteristics of sintered diatomite membranes

Song

2013

J. Ceram. Soc. Japan

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Recently, porous ceramic membranes have become an interesting subject due to their outstanding thermal and chemical stability. Among the many types of ceramics, as diatomite is inherently porous and irregular, it is worthwhile to investigate the relationship between the characteristics of sacrificial templates and porous microstructures after sintering. Therefore, sintered diatomite membranes were prepared with 8¯m solid polymer spheres, 20¯m solid polymer spheres, wheat starch, and light clusters of aggregated carbon nanotubes while varying the amount of sacrificial template material by dry pressing at 25 MPa. The results show that the characteristics of the sacrificial templates, e.g., the rigidity, directly affect the pore characteristics and accordingly determine the permeability of sintered diatomite membranes. Also, we discuss whether the largest pore sizes and average pore sizes of the sintered diatomite membranes reflect the actual permeability appropriately.

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Section: Resultsmentioning

confidence: 99%

The effect of sacrificial templates on the pore characteristics of sintered diatomite membranes

Song

2013

J. Ceram. Soc. Japan

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“…Several fabrication methods like mechanical alloying with high energy ball milling, nanosintering, vortex process, spray deposition, electrical plating, sol-gel synthesis, laser deposition etc. have been adopted for the synthesis of nanocomposites [3,5,7,14] . The mixing of nano-sized particles is a time taking, energy consuming, and expensive in mechanical alloying technique.…”

Section: Introductionmentioning

confidence: 99%

Influence of ultrasonic cavitation on microstructure and mechanical response of an aluminum/alumina nanocomposite

Mohanty

Mishra

Varma

et al. 2015

Science and Engineering of Composite Materials

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Nanocomposites of Al and Al 2 O 3 were synthesized by an ultrasonic full cavitation technique which is a novel route for synthesis of uniformly distributed nanoparticles in metal matrix composites. The transmission electron micrograph indicates the uniform arrangement of nanoparticles throughout the metal matrix and the average size of the nanoparticles are in the order of 5 nm. The selected area electron diffraction analysis shows the presence of both Al and Al 2 O 3 phases, which is also evidenced from the X-ray photoelectron spectroscopy analysis. The significant improvement in hardness and Young ' s modulus due to the addition of a low weight fraction of nano-sized Al 2 O 3 in aluminium infers that alumina nanoparticulates are distributed uniformly throughout the aluminium metal matrix. Hence, this paper shows a new method for inexpensive fabrication of bulk light weight metal matrix nanocomposites (MMNCs) by the use of noncontact full cavitation method.

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“…The high pure alumina ceramics have attracted more attentions from the researchers and engineers in the ceramic field over the last decades due to their unique combination of properties such as high hardness, high strength, good electrical resistivity and optical performance [1][2][3][4][5][6][7]. Over the years a number of methods have been developed for the fabrication of high dense alumina ceramic.…”

Section: Introductionmentioning

confidence: 99%

The INFLUENCES OF FLUORIDES ON THE TRANSFORMATION OF Α -ALUMINA CRYSTALS

Tian¹

2017

Ceramics - Silikaty

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Influence of addition of aluminum fluoride (AlF 3) and ammonium fluoride (NH 4 F) on transformation of α-Al 2 O 3 from boehmite was investigated. Transformation of α-Al 2 O 3 occurred at about 1050°C and 950°C, when boehmite contained AlF 3 and NH 4 F additives respectively, which was 150°C and 300°C lower than that without any additives. The formed α-Al 2 O 3 consisted of clear, hexagonal plate-like particles about 2-3 µm in diameter and 200 nm in thickness. However, the formed hexagonal platelet particles gradually became blunt at edges and decreased in sizes at the higher calcinating temperatures. The transfer of α-Al 2 O 3 morphology was due to the diminution and disappearance of fluorine. The fluoride coated on the surfaces were firstly decomposed and then fluorine entered the lattices of crystals was volatilized. The fluoride with tiny particles attached on the surface had a same chemical bonding of F-Al-O with that in the lattices of crystals.

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Effect of high energy ball milling on compressibility and sintering behavior of alumina nanoparticles

Cited by 31 publications

References 22 publications

The effect of sacrificial templates on the pore characteristics of sintered diatomite membranes

The effect of sacrificial templates on the pore characteristics of sintered diatomite membranes

Influence of ultrasonic cavitation on microstructure and mechanical response of an aluminum/alumina nanocomposite

The INFLUENCES OF FLUORIDES ON THE TRANSFORMATION OF Α -ALUMINA CRYSTALS

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