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Novel binder system based on paraffin-wax for low-pressure injection molding of metal-ceramic powder mixtures
A novel binder system originally developed for LPIM (low-pressure injection molding) of Al2O3 is presented. The development of these advanced LPIM suspensions is based upon steric stabilization by a combination of short and long chain molecules with addition of a hyperdispersant. The main organic constituent is paraffin wax. The potential for application to different powder mixtures containing milled Al, Cr, Fe, and NiAl particles as well as ZrO2 is investigated. Suspensions with high solid contents between 58 and 60 vol.% could be fabricated and successfully used for LPIM. The flow behavior was shear-thinning and non-Newtonian for all the suspensions investigated. The binder composition developed for Al2O3 suspensions had to be adapted to the different surface chemistry and larger specific surface area of mixtures for the fabrication of alumina-aluminide alloys. Still, the irregular shape of the milled aluminum particles may lead to a higher viscosity at the same solid content due to mechanical interlocking. The water content of the precursor powders was found to influence significantly the viscosity of the fabricated suspension, so that dried powders were used. The water consumption of injection molded parts was found to be low. The binder system used seems to be less sensitive to water than suspensions stabilized with stearic acid. Injection molded samples with a cross section up to 10 mm x 10 min could be successfulIy debinded. The required debinding times are relatively long, so that further optimization seems to be necessary for production on an industrial scale.
Novel binder system based on paraffin-wax for low-pressure injection molding of metal-ceramic powder mixtures
A novel binder system originally developed for LPIM (low-pressure injection molding) of Al2O3 is presented. The development of these advanced LPIM suspensions is based upon steric stabilization by a combination of short and long chain molecules with addition of a hyperdispersant. The main organic constituent is paraffin wax. The potential for application to different powder mixtures containing milled Al, Cr, Fe, and NiAl particles as well as ZrO2 is investigated. Suspensions with high solid contents between 58 and 60 vol.% could be fabricated and successfully used for LPIM. The flow behavior was shear-thinning and non-Newtonian for all the suspensions investigated. The binder composition developed for Al2O3 suspensions had to be adapted to the different surface chemistry and larger specific surface area of mixtures for the fabrication of alumina-aluminide alloys. Still, the irregular shape of the milled aluminum particles may lead to a higher viscosity at the same solid content due to mechanical interlocking. The water content of the precursor powders was found to influence significantly the viscosity of the fabricated suspension, so that dried powders were used. The water consumption of injection molded parts was found to be low. The binder system used seems to be less sensitive to water than suspensions stabilized with stearic acid. Injection molded samples with a cross section up to 10 mm x 10 min could be successfulIy debinded. The required debinding times are relatively long, so that further optimization seems to be necessary for production on an industrial scale.
Novel binder system based on paraffin-wax for low-pressure injection molding of metal-ceramic powder mixtures
Ein neues, auf Paraffinwachs basierendes Bindersystem für das Niederdruck-Spritzgießen von Pulvermischungen aus Metall und Keramik
Leverkoehne, M. (author) / Coronel-Hernandez, J. (author) / Dirscherl, R. (author) / Gorlov, I. (author) / Janssen, R. (author) / Claussen, N. (author)
Advanced Engineering Materials ; 3 ; 995-998
2001
4 Seiten, 6 Bilder, 1 Tabelle, 17 Quellen
Article (Journal)
English
Binder (keramische Anwendung) , organisches Bindemittel , Paraffinwachs , Spritzgießverfahren , Niederdruckgießen , Neuentwicklung , Verfahrensparameter , Teilchengröße , Viskosität-Temperatur-Verhalten , nicht-Newtonsche Flüssigkeit , Suspension , Bruchflächenaussehen , Wasseraufnahmevermögen , Pulvermetallurgie , Aluminiumoxid , Aluminium , Chrom , Eisen , Nickelaluminid , Zirkoniumoxid , Anwendbarkeit
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