Preparation and sintering of nanosized α-Al2O3 powder

Karagedov, G. R.; Lyakhov, N. Z.

doi:10.1016/s0965-9773(99)00331-1

Cited by 81 publications

(64 citation statements)

References 30 publications

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“…Previously [19], we already noted that long-term boiling of the Al Additional studies made by ESR spectroscopy have unambiguously supported the assumption on the formation of the Al 2 O 3 -Fe 2 O 3 solid solution under intense grinding. The logical conclusion is that the α-Al 2 O 3 crystal lattice also contains Cr.…”

Section: Contamination During Grindingsupporting

confidence: 54%

Mechanochemical Grinding of Inorganic Oxides

Karagedov

Lyakhov

2003

KONA

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Section: Contamination During Grindingsupporting

confidence: 54%

Mechanochemical Grinding of Inorganic Oxides

Karagedov

Lyakhov

2003

KONA

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“…The energy associated with higher BPMR seems to be utilized partly to reduce the particle size and partly as a form of heat energy to reduce the lattice imperfections, thereby annealing the cubic lattice. In other words, such variations may also be ascribed to the agglomerations of small nanometric particles (Karagedov & Lyakhov, 1999;Welham, 1999).…”

Section: Resultsmentioning

confidence: 99%

Preparation and microstructure characterization of ball-milled ZrO₂powder by the Rietveld method: monoclinic to cubic phase transformation without any additive

Bid

Pradhan

2002

J Appl Cryst

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The phase transformation kinetics of high-energy ball-milled monoclinic ZrO 2 have been studied in detail by Rietveld powder structure re®nement analysis. In the present study, no stabilizing compound was required to obtain the cubic phase. The ®ne-grain powder was milled in a planetary ball mill for up to several hours at different BPMRs (ball to powder mass ratios): 10:1, 20:1, 35:1 and 40:1. During the process of ball milling, the monoclinic phase is gradually transformed to the cubic phase. The relative phase abundances of the respective phases, the particle sizes, the r.m.s. strains, the lattice parameter changes, etc., have been estimated from Rietveld analysis of X-ray powder diffraction data. It has been found that a higher BPMR exerts more in¯uence on rapid phase transformation. In the m-to c-ZrO 2 phase transformation, no formation of an intermediate tetragonal ZrO 2 phase has been found. The small change in the lattice volume of m-ZrO 2 , which is very close to the lattice volume of c-ZrO 2 , caused by ball milling may be attributed to this phase change. The formation of the c phase is noticed, in general, after just 1 h of ball milling, and the particle size of the m phase is reduced to a large extent at the ®rst stage of milling and remains almost unchanged with increasing milling time. However, the particle size of the c phase increases with increasing milling time for the samples milled with higher BPMRs (35:1 and 40:1), suggesting that quenching caused by a high impact energy followed by an annealing effect may play a vital role, which is further manifested in the agglomeration of small particles.

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“…Several applications, which span from the metal industry to the field of medical and cosmetic, are now directed to the mechanochemical synthesis of ceramic powders such as, for instance, nanocrystalline Al 2 O 3 . [36] CONCLUSION This article has presented some aspects of mechanochemical synthesis of nanophase powders, with an elementary modeling of the process [37] and a general description of the results in the field. Mechanosynthesis is one of the most appealing technologies for the synthesis of nanophase materials, and, at an industrial and commercial level, it is already exploited for sintered products, [23] abrasive processing, [22] catalysis, [22,23] medical, [23] cosmetic, [23,35] and even cleaning applications.…”

Section: Industrial Trends and Resultsmentioning

confidence: 99%