Research on the Way of Obtaining the Parts of Sintered Powders by Injection Moulding


Article Preview

For obtaining small parts with complex shape, for which a finishing operation cannot be applied easily, injection forming can be used. For a successful applying of this procedure not only the conditions of the injection process deployment must be taken into consideration, but also the conditions of the binder removal. These conditions impose, in a big measure, the feedstock characteristics, especially the ones of the binder used. The characteristics of the binder mixed with powder influence the injection process, the debinding process and the quality of the injected and sintered parts. Regarding that the binders used are formed from many components, it is very important to know the measure that each of them determines the rheological characteristics of the mixture. In the research made, a binder was used formed from polyethylene, paraffin and stearic acid, a binder which is often used to obtain mixtures for injection. It was watched how these components influence the binder characteristics, the injection process deployment and the effect they have on the quality of the debinded parts.



Edited by:

Ionel Chicinaş and Liviu Brânduşan






L. Brânduşan "Research on the Way of Obtaining the Parts of Sintered Powders by Injection Moulding", Materials Science Forum, Vol. 672, pp. 237-240, 2011

Online since:

January 2011




[1] D. W. Chung, B. O. Rhee, M. Y. Cao, C. X. Liu, Requirements of Binder for Powder Injection Molding, Advances in Powder Technology, 1989, vol. 3, pp.67-78.

[2] R. M. German, A. Bose, Injection Molding of Metals and Ceramics. Princeton, MPIF, 1990, 147-193.

[3] L. Brânduşan, P. G. Xiao, Effect of Aditional Elements to Some Liants Used in PIM on Rheological Characteristics, RoPM 2005, Sinaia, Romania, vol. 2, pp.749-754.

[4] Venjea J. Tseng, Dean-Mo Liu, Chung-King Hsu, Influence of Stearic Acid on Suspension Structure and Green Microstructure of Injection-Molded Zirconia Ceramics., Ceramics International 25, 1999, pp.191-195.

DOI: 10.1016/s0272-8842(98)00024-8

[5] D. I. Lee, Viscosity of Concentrated Suspensions. Transactions of the Society of Rheology. 1969, vol. 13, pp.273-288.

[6] T. B. Lewis, L. E. Niesen, Viscosity of Dispersed and Aggregated Suspensions of Spheres,. Transactions of the Society of Rheology, 1968, vol. 12, pp.421-443.

DOI: 10.1122/1.549114

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