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Materials

Manufacturing Techniques and Production Process

Know-how for perfect pieces

Wear resisting components for use in the Chemical and Engineering industries are produced mainly by "dry pressing" or "isostatic pressing". The most economic method will depend on size, geometry, and the quantity required.

High purity powders are prepared by special processes and plasticised for main shaping operation. 

During pressing, the powder will be compacted into a mould. Bores, corners, chamfers and grooves can be pressed only in the axial direction in order to ensure that the piece can be removed from the mould. Irregular wall thickness, sharp corners and changes in cross section should be avoided. 

The compacted components have a chalk-like consistency and can, if necessary, be machined by grinding, sawing, boring and turning. Thus bores, grooves and undercuts deviating from the axial direction can be applied before sintering. 

All necessary shaping should be completed before the sintering stage as further processing can only be carried out by expensive diamond grinding. During the sintering process, carried out at 1.800C, Alumina, Zirconia, and Silicon Carbide shrink in volume by up to 45%. 

By these methods tolerances of 1% (minimum 0,1 mm) of the nominal size can be met. 

Penetration tests are carried out after sintering to eliminate any components shown to have fissures or other imperfections. 

Follow the link for further information on the manufacturing tolerances

 

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Last modified:
Friday, 06 July 2012