TY - JOUR AU - Chuankrerkkul, Nutthita AU - Messer, Peter F. AU - Davies, Hywel A. PY - 2017/04/23 Y2 - 2024/03/29 TI - Powder injection moulding of cemented carbides: Feedstock preparation and injection moulding JF - Journal of Metals, Materials and Minerals JA - J Met Mater Miner VL - 17 IS - 1 SE - Original Research Articles DO - UR - https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/272 SP - AB - 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. ER -