Ferrous Powder Metallurgy by Andrej Salak

By Andrej Salak

End result of the place of ferrous powder metallurgy, the writer bargains with the theoretical basics and technical and technological features of the present country of data in ferrous powder metallurgy in order that specific awareness will be given to all elements influencing components and fabrics with the mandatory homes, shape and dimensions, stressing their larger monetary potency. The publication additionally exhibits the wide chances for additional improvement of ferrous powder metallurgy and may for that reason give a contribution to expanding the extent of common and exact wisdom of specialists operating during this zone and may assist in transition from fabrication of elements by means of traditional tools with all general financial and ecological shortcomings to fabrication via powder metallurgy equipment.

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This scrap is melted in arc furnaces. The melt should be superheated and its temperature should be around 1680°C. The form of the powder particles is irregular as a result of the given conditions of water atomisation (surface tension and pressure of the liquid). 23 Equipment for metal powder production by water atomisation (Kawasaki). 18 1) metal stream, 2) atomising nozzles, 3) nitrogen supply, 4) water supply, 5) vessel, 6) discharge of powder with water, 7) metal grid, 8) protective boom, 9) water overflow, 10) equalisation reservoir.

Depending on the susceptibility to formation of powders of a specific form, atomised metals can be divided into three groups. e. of aluminium type. When atomising these metals with a medium containing oxygen, a surface envelope of high-melting oxides forms on the droplet surface. These oxides prevent spheroidising and, consequently, particles of an irregular form appear. The second group includes metals with a lower affinity for oxygen (for example, lead, tin), which form oxides with a higher melting point than that of pure metal.

Examples are porous materials, self-lubricating bearings, metal filters, porous electrodes, diaphragms, and others. This group includes the production of refractory metals, (W, Mo, Ti, Nb, Ta), which can be produced more efficiently by powder metallurgy procedures. It also includes materials which are not mutually miscible in the liquid condition because of their different melting points, or in which the admixture content exceeds its solubility in the basic metal. Such are materials for electric contacts (WCu, WAg, AgCdO), composite materials (Cugraphite), various friction materials and others.

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