Spray combustion synthesis of nanocrystalline Y2O3 and its thermodynamical and morphological study

Nano Y2O3 particles with a spherical shape and narrow size distribution have been prepared by a novel spray combustion method. The experimental procedure is briefly described and the thermodynamical process of the post-heat treatment is investigated in this paper. The precursor fully crystallized when treated at as low as 400 degrees C. Prepared particles showed spherical shape and well dispersibility under different treating conditions. Narrow size distribution of particles was achieved even when the precursor was treated at 1373 K. (C) 2007 Elsevier B.V. All rights reserved.

The laser-assisted cold spray process

Thick metal coatings are currently deposited via two well established routes, Laser or arc based cladding, and thermal spray. A new coating technique known as Laser-assisted Cold Spray (LCS), which aims to expand on the capabilities of the two process routes currently available, is under development at the University of Cambridge in the UK. LCS is a development of the Cold Spray process (CS) in which coatings are built up from powder particles which are entrained within a gas stream and accelerated through a de Laval nozzle, impacting the substrate at supersonic speeds that exceed a material dependent critical velocity.