Title

Synthesis Of Nanostructured Spherical Aluminum Oxide Powders By Plasma Engineering

Abstract

Irregularly shaped aluminum oxide particles were plasma atomized resulting in narrow size range distribution of spherical nanostructured powders. Cooling rates, on the order of 106 to 108 K/s, were obtained from the different quenching medias, viz. air, water, and liquid nitrogen. Plasma-engineered powder particles developed nanosize crystallites, while solidification provided insight into the morphological feasibility in refinement of grain size. X-ray diffraction (XRD) methods have been used to quantify the crystallite size obtained with different quenching media. Raman peak shift validated the X-ray analysis in anticipating the grain refinement with increasing cooling rates. Salient structural morphology characteristics and a detailed understanding of spheroidized plasma-sprayed alumina powders were analyzed through scanning electron microscopy (SEM) studies. Formation of nanograins, novel metastable phases, and amorphous structure were endorsed by transmission electron microscopy (TEM) investigations.

Publication Date

1-1-2005

Publication Title

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

36 A

Issue

2

Number of Pages

301-309

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s11661-005-0303-0

Socpus ID

15044353991 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/15044353991

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