Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Powder injection moulding of WC-Co hardmetal components using a peg/pmma composite binder system
A composite binder system, successfully developed earlier for powder injection moulding of stainless steels, CoCrMo and NiCrSiB alloys, has been adapted for tungsten carbide-cobalt hardmetal components. The composite binder consists of a major fraction of polyethylene glycol (PEG), which can be removed rapidly by water leaching, a minor fraction of a finely dispersed polymethyl methacrylate (PMMA), which retains rigidity of the components, and stearic acid (SA) to act as a lubricant. Feedstocks containing a powder loading of the WC-Co up to 60 vol% can be moulded successfully. The mouldings can retain their shapes during and after solvent debinding. Interconnected pores are formed after solvent debinding, resulting in faster removal of the remaining binder by subsequent pyrolysis. The adjustments made to the binder compositions and to the process parameters to achieve successful moulding and debinding and the properties and microstructure of sintered components are reported.
Powder injection moulding of WC-Co hardmetal components using a peg/pmma composite binder system
A composite binder system, successfully developed earlier for powder injection moulding of stainless steels, CoCrMo and NiCrSiB alloys, has been adapted for tungsten carbide-cobalt hardmetal components. The composite binder consists of a major fraction of polyethylene glycol (PEG), which can be removed rapidly by water leaching, a minor fraction of a finely dispersed polymethyl methacrylate (PMMA), which retains rigidity of the components, and stearic acid (SA) to act as a lubricant. Feedstocks containing a powder loading of the WC-Co up to 60 vol% can be moulded successfully. The mouldings can retain their shapes during and after solvent debinding. Interconnected pores are formed after solvent debinding, resulting in faster removal of the remaining binder by subsequent pyrolysis. The adjustments made to the binder compositions and to the process parameters to achieve successful moulding and debinding and the properties and microstructure of sintered components are reported.
Powder injection moulding of WC-Co hardmetal components using a peg/pmma composite binder system
Chuankrerkkul, N. (Autor:in) / Messer, P.F. (Autor:in) / Davies, H.A. (Autor:in) / Ellis, B. (Autor:in)
2004
8 Seiten, 6 Bilder, 2 Tabellen, 9 Quellen
Part 4
Aufsatz (Konferenz)
Englisch
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