expressions for some specific liquids in a certain range of atomising conditions.5 As the atomising mode depends This paper investigates the effects of atomiser design critically upon the liquid flow conditions on the atomiser, and processing parameters on the morphology and it is critical to understand the behaviour of the liquid flow size distribution of centrifugally atomised tin powder.on the disc in order to obtain powders with the desired Premature solidification of the melt on the atomiser properties. The flow behaviour of the melt in centrifugal and poor wetting of the atomiser by the melt were atomisation is usually complicated. Mathematical modelfound to be the main causes of unsuccessful atomisling can be used to calculate the thickness and velocity ation. The particle size distributions of the powders profiles of the liquid metal film and thus to predict or follow a lognormal distribution. The median particle explain the experimental results, such as particle shape and size increased with decreasing atomiser rotation speed size distribution.6-8 However, these models need to be and with increasing melt flowrate. Cups with a high experimentally validated before they can be used with included angle made significantly finer powders than confidence. flat discs under the same operating conditions.Sufficient wetting of the atomiser by the molten metal is PM/1053 essential for rapid acceleration and consequently effective disintegration of the melt. In the centrifugal atomisation of Dr Xie
The recent upsurge of interest in manufacturing techniques using metal powders, including additive manufacturing (AM), metal injection moulding (MIM) and hot isostatic pressing (HIP), has made methods for manufacturing alloyed metal powders especially iron-, nickel- and cobalt-based alloys, a topic of much increased importance. Drawing on 45 years of experience in the field, the author reviews the range of methods available for this purpose, their advantages and limitations and likely fields of application.
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