Abstract:
Metal injection moulding (MIM) is a near-net-shaping powder metallurgy
technique suitable for the cost-effective mass production of small and
complex components. In this paper, the effects of the metal powder particle
size on the final properties of 17-4 PH stainless steel are reported. Three
different particle sizes (d50 33.0, 7.91 and 4.04 μm) were used to prepare
the injectable MIM feedstocks using a CSIR-developed wax-based binder
system at a fixed solids loading of 60 vol.%. The distribution slope
parameter and the rheological flow index behaviour were used to predict
the flowability of the feedstocks. The effects of the particle size on MIM
products were established. The results are discussed in terms of the
subsequent microstructural and mechanical properties of MIM 17-4 PH
stainless steel against the established MPIF Standard 35.
