By F. Thummler, R. Oberacker
Publication through Thummler, F., Oberacker, R
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Additional info for B0490 Introduction to powder metallurgy
23) and has a good compressibility, although the pressed density is influenced by its microporosity. 2). 3 a variety of commercial iron powders based on this process in addition to atomised powder is listed and some of their properties are shown. Most sintered iron and steel parts are manufactured from those powders, which can be partly obtained also with reduced density. Attempts have also been made to reduce milling 'scale'for the production of iron powder. e. from big milling plants, producing high purity and uniform quality over long periods.
G. ) which form highly stable oxides, have to be deposited from molten salt electrolytes. While aqueous solutions are employed at slightly ele- Powder Production Techniques 45 vated temperatures (up to 60°C) the molten salt process needs higher temperatures, depending on the melting point of suitable (binary or ternary) salt eutectics which should contain a reasonable concentration of the metal to be deposited. The powder can be obtained directly or indirectly, the latter by milling of the often hydrogen-embrittled deposits.
Centrifugal Atomisation The centrifugal atomisation processes use centrifugal force for the melt disintegration and involve one or two process steps (Fig. 15). In the single step method, a liquid film is produced on the surface of a rapidly rotating consumable alloy bar by an arc (rotating electrode process), plasma, or electron beam source. The electrode or alloy bar, which is rotating at up to 15,000 rpm has to meet stringent requirements as to stability, uniformity and surface quality. The melt cannot be highly superheated, as the molten material then rapidly runs off from the electrode.