Mixing and Characterisation of Stainless Steel 316L Feedstock for Waste Polystyrene Binder System in Metal Injection Molding (MIM)


Article Preview

This paper describes the mixing process and homogeneity analysis of a newly developed binder system based on waste polystyrene (PS) and palm kernel oil (PKO) to produce feedstock for metal injection molding (MIM). Since mixing is a critical step in MIM process, hence the mixture of powder and binder should be homogeneous and injectable. In this study, water atomised Stainless Steel powder was mixed with a new binder system consisting of waste polystyrene and palm kernel oil in a Brabender Plastograph EC rotary mixer. Several tests were performed to assess the homogeneity of the feedstock that was produced at 60 vol.% powder loadings. The 60 vol.% was chosen because the Critical Powder Volume Concentration (CPVC) of the SS316L powder was found to be 64.8 vol.%. The tests conducted were density, binder burn-out and SEM morphology observation. It was found that the feedstock shows good homogeneity and suitable for further processing in MIM.



Edited by:

Peng-Sheng Wei






R. Asmawi et al., "Mixing and Characterisation of Stainless Steel 316L Feedstock for Waste Polystyrene Binder System in Metal Injection Molding (MIM)", Applied Mechanics and Materials, Vol. 607, pp. 83-86, 2014

Online since:

July 2014




* - Corresponding Author

[1] Bockhorn II, Hornung A. & Hornung, U. 1998. Gasification of polystyrene as initial step in incineration, fires or smoldering of plastics. Twenty-Seventh Symposium (International) on Combustion/ The Combustion Institute1343-1349.

DOI: 10.1016/s0082-0784(98)80539-0

[2] S. Li, B. Huang, Y. Li, X. Qu, S. Liu, and J. Fan, A new type of binder for metal injection molding, J. Mater. Process. Technol., vol. 137, no. 1–3, p.70–73, Jun. (2003).

[3] German, R. and Bose, A., Powder Metallurgy Science, Metal process Industries Federation, 472 p., (1994).

[4] R. Supati, N. H. Loh, K. A. Khor, and S. B. Tor, Mixing and characterization of feedstock for powder injection molding, no. November, p.0–5, (2000).

DOI: 10.1016/s0167-577x(00)00151-8

[5] L. Liu, N. H. Loh, B. Y. Tay, S. B. Tor, Y. Murakoshi, and R. Maeda, Mixing and characterisation of 316L stainless steel feedstock for micro powder injection molding, Mater. Charact., vol. 54, no. 3, p.230–238, Mar. (2005).

DOI: 10.1016/j.matchar.2004.11.014

[6] X. Kong, T. Barriere, and J. C. Gelin, Journal of Materials Processing Technology Determination of critical and optimal powder loadings for 316L fine stainless steel feedstocks for micro-powder injection molding, J. Mater. Process. Tech., vol. 212, no. 11, p.2173–2182, (2012).

DOI: 10.1016/j.jmatprotec.2012.05.023

[7] D. Checot-Moinard, C. Rigollet, and P. Lourdin, Powder injection moulding PIM of feedstock based on hydrosoluble binder and submicronic powder to manufacture parts having micro-details, Powder Technol., vol. 208, no. 2, p.472–479, (2011).

DOI: 10.1016/j.powtec.2010.08.045

In order to see related information, you need to Login.