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The general sequence of operations involved in the powder metallurgy process is shown schematically in the following organigram:
The component powders are mixed, together with lubricant, until a homogeneous mix is obtained. The mix is then loaded into a die and compacted under pressure, after which the compact is sintered. An exception is the process for making filter elements from spherical bronze powder where no pressure is used; the powder being simply placed in a suitably shaped mould in which it is sintered. This process is known as loose powder sintering
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