A wide range of additional operations or treatments can be carried out on the parts after they have been sintered.
Sintered parts may be heat treated to increase strength and also hardness for improved wear resistance.
The controlled porosity of P/M parts permits their impregnation with oil and resin. This operation is used to give the part self lubricating properties.
Resin Impregnation :-
Used to improve machinability, seal parts gas or liquid tight, or prepare the surface for plating.
An alternative method of improving the strength of inherently porous sintered parts is to fill the surface connected pores with a liquid metal having a lower melting point.
Pressure is not required, capillary action is sufficient, provided that the infiltrant wets the metal concerned. It is desirable, however, that the infiltrant have a limited capacity to dissolve the metal being infiltrated otherwise the surface of the part may be eroded.
The process is used quite extensively with ferrous parts using copper as infiltrant but to avoid erosion, an alloy of copper containing iron and manganese, is often used.
All normal machining operations can be carried out on sintered components.
Usually used for holes not in the direction of the pressing.
GTB's patented production process allows side holes to be produced in certain applications without the need for drilling.
Barrelling is used to remove burrs and sharp corners.
Various types of surface treatment are available to increase corrosion resistance to withstand the most demanding of environments.
Includes, deburring, burnishing, coating oil dip, plating, welding, and mechanical surface treatments.
Other finishing operations can be carried out. GTB will be pleased to quote for any other requirements.
Joining / Sinter Brazing:-
When it is not possible to produce a component to full "net shape" it is often possible to join 2 or more components together by brazing either during the sintering process. or as a secondary operation.
Joining / Welding:-
Materials are available to allow all types of welding operations to be carried out, eg MIG / TIG / Projection welding
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