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2. Feedstock components and composition
Feedstock preparation is a fundamental step in the PIM process. It is generally carried out using mixers and/or extruders under a high shear rate, to ensure good mixture homogeneity.
Note
The characteristics of the powder (chemical nature, size, morphology) and the binder (chemical nature, viscosity) are key parameters that affect the proportions of the components in the mixture.
The powder/binder ratio is crucial.
A relatively large quantity of powder must be incorporated into the binder to ensure part cohesion. However, excess powder results in high system viscosity, making injection difficult. As a result, cracks may appear during subsequent process steps.
Too much binder, on the other hand, can cause parts to collapse...
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Feedstock components and composition
Feedstock injection
Bibliography
Events
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Congress organized by EPMA: EuroPM, held every year in Europe
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Congress organized by the Metal Powder Industries Federation: PowderMet takes place every year in the USA
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Patents
SCHWARTZWALDER (K.), Refractory body and method of making same, US Patent 2122960 (1938).
SMITH (D.J.), SHAPPIE (T.B.), SANFORD (R.A.), LIESZ (R.J.), Tungsten-carbide articles made by metal injection molding and method, US Patent 6790252 (2004).
MIYASHITA (T.), UENO (Y.), NISHIO (H.), KUBODERA (S.), Method for removing the dispersion medium from a molded pulverulent material, US...
Directories
Manufacturers – Suppliers – Distributors (non-exhaustive list)
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Feedstocks
BASF
Polymer Chemie
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Statistical and economic data
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Breakdown of sales between MIM and CIM industries
Data taken from German's work [6], see figures 1 and
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