Critical thickness in binder removal process for injection molded compacts

Copper injection molding using a thermoplastic binder based on paraffin wax

“…As it is shown after 45 min, 60% and after 3.5 h, 92% of paraffin wax can be removed. It is considered that after removing 40% of binder, there exists some interconnected capillary porosity inside of specimen which makes leaving of gaseous products in subsequent thermal debinding easy in short time [5]. Since nearly 60% of paraffin wax was removed in solvent debinding step, subsequent thermal debinding can be performed with higher speed in comparison with usual thermal debinding process.…”

Effect of powder loading on metal injection molding stainless steels

“…Dropmann et al [11] increased the powder loading to 75% using comparatively coarse spherical Ni-base alloy powders combined with an appropriate low viscosity binder. They got a conclusion that the minimum amount of binder used leads to a reduced shrinkage after solidification, [12] investigated the effect of the powder loading on the critical compact thickness during binder removal, concluded that the critical thickness was inversely proportional to the powder loading. German et al [13] studied the effect of powder loading on the in situ dimensional change during solvent debinding of powder injection molded components.…”

Powder injection molding 440C stainless steel

“…For the specimens with 3.12 mm thickness, after 1 h, 42% of binder had been removed. It is considered that after removing 40% of binder, there exists some interconnected capillary porosity inside of the specimen, which makes leaving of gaseous products in subsequent thermal debinding easy in a short time [6]. Hence, the solvent debinding rate can reach 2 mm/h through the use of this kind of binder.…”