These are secondary operations intended to provide dimensional tolerances and better surface finish. They are sizing, coining, machining, impregnation, infiltration, heat treatment, and plating.
Sizing: It is repressing the sintered component in the die to achieve the required size with accuracy.
Coining: It is repressing the sintered components in the die to increase density and to give additional strength.
Machining: Machining operation is carried out on sintered part to provide under cuts, holes, threads, etc. which cannot be removed on the part in the powder metallurgy process.
Impregnation: It is filling of oil, grease, or other lubricants in a sintered component such as bearing.
Infiltration: It is filling of pores of sintered product with molten metal to improve physical properties.
Heat Treatment: The processes of heating and cooling sintered parts are used to improve wear resistance, grain structure, and strength of the product.
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