Water atomised aluminium alloy powders

The new rapid solidification (RS) process based on high-pressure water atomisation (WA) of the melt for manufacturing of advanced aluminium alloys was realised in the form of a pilot plant. The problems of safe operation in the course of Al alloy powder production and powder quality were solved by t...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2004-10, Vol.383 (1), p.7-13
Main Authors: Neikov, O.D., Vasilieva, G.I., Sameljuk, A.V., Krajnikov, A.V.
Format: Article
Language:English
Subjects:
Aluminium powder
Applied sciences
Exact sciences and technology
Gas emission
Metal powders
Metals. Metallurgy
Microstructure
Powder metallurgy. Composite materials
Production techniques
Tensile strength
Water atomisation
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Summary:The new rapid solidification (RS) process based on high-pressure water atomisation (WA) of the melt for manufacturing of advanced aluminium alloys was realised in the form of a pilot plant. The problems of safe operation in the course of Al alloy powder production and powder quality were solved by the use of water solutions of inhibitors, by the control of suspension temperature and hydrogen ion exponent (pH), by the hydraulic classification of atomised products, and by the optimisation of dehydration procedure. The rate of powder–water interaction strongly depends on the value of pH. While the rate of room temperature reactions is very slow at pH 3.0–4.0, the increase of pH to 6.0 leads to an intensive powder oxidation. A set of powder metallurgy (PM) alloys for various applications was produced on the base of water atomised powders. The characteristics of tensile strength of such alloys essentially exceed those of cast materials of similar compositions.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2004.02.030