Powder injection moulding of cemented carbides: Feedstock preparation and injection moulding

Authors

N Chuankrerkkul
P F. Messer
H A. Davies

Publication Date

2007-07-01

Abstract

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 (WC-Co) cemented carbides. The binder consists of a major fraction of polyethylene glycol (PEG), which can be removed rapidly by leaching with water, a minor fraction of a finely dispersed polymethyl methacrylate (PMMA), which retains rigidity of the components and sometimes with stearic acid (SA) to act as a lubricant. The adjustments made to powder characteristics, binder compositions and process parameters to achieve successful injection moulding are reported. Feedstocks containing a powder loading of the WC-Co up to 60 vol% can be moulded successfully. The moulded specimens had good green strength, in the range 12-17 MPa for three point bend tests.

First Page

53

Last Page

57

Recommended Citation

Chuankrerkkul, N; Messer, P F.; and Davies, H A. (2007) "Powder injection moulding of cemented carbides: Feedstock preparation and injection moulding," Journal of Metals, Materials and Minerals: Vol. 17: No. 1, Article 9.
Available at: https://digital.car.chula.ac.th/jmmm/vol17/iss1/9