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Advances in powder metallurgy: Properties, processing and by Isaac Chang, Yuyuan Zhao

By Isaac Chang, Yuyuan Zhao

Powder metallurgy is a well-liked steel forming expertise used to provide dense and unique parts. varied powder and part forming routes can be utilized to create an finish product with particular homes for a selected program or undefined. The editor and specialist members evaluate the advances in powdered steel homes, processing and purposes. They discover the formation of steel powders, the fabrics used and their houses, production innovations and the characterization and trying out and functions of steel powders.

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However, before proposal of the FFC Cambridge process, no previous work had succeeded to utilise this electrochemistry © Woodhead Publishing Limited, 2013 24 Advances in powder metallurgy for extraction of metals, particularly reactive metals and semi-metals like titanium and silicon. Cell designs are a core technological issue in the research and development of the FFC Cambridge process. A number of cell designs have been proposed, as shown in Fig. 31 Several other technological issues are discussed below in connection with the configuration of the cell.

These advantages of powder metallurgy can only be realised on the basis of the low cost availability of the various metal and alloy powders. Metal powders are industrially produced by two main techniques. 7 The principle of atomisation is to force a liquid metal together with a stream of gas through a small orifice that turns the liquid into small droplets which, upon cooling, solidify into fine particles. The direct product from atomisation usually features spheres, as shown in Fig. 8 The particle sizes of metal powders produced by atomisation vary, ranging from tens of micrometres to sub-micrometres, although products can be made more uniform by process control and/or post-process sieving.

Chen, Annu. Rep. Prog. , Sect. C: Phys. , 2008, 104, 189. 5 G. Dowson, Powder Metallurgy – The Process and Its Products, Adam Higher, New York, 1990. 6 W. -P. Wieters, Powder Metallurgy — Processing and Materials, European Powder Metallurgy Association, Shrewsbury, 1997. J. J. Dunkley, Atomization of Melts – For Powder Production and Spray Deposition, Clarendon Press, Oxford, 1994. com/High_Purity_Aluminum_Powder--5211867_5211970. html (viewed on 14 June 2012). 9 G. H. Gessinger, Powder Metallurgy of Superalloys, Butterworth and Co, London, 1984.

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