The effect of powder characteristics on pressure sensitivity of powder injection moulding compounds

0351791 - ÚH 2011 RIV CH eng J - Journal Article
Hausnerová, B. - Sedláček, T. - Filip, Petr - Sáha, P.
The effect of powder characteristics on pressure sensitivity of powder injection moulding compounds.
Powder Technology. Roč. 206, č. 3 (2011), s. 209-213. ISSN 0032-5910. E-ISSN 1873-328X
R&D Projects: GA ČR GA103/08/1307
Institutional research plan: CEZ:AV0Z20600510
Keywords : pressure sensitivity coefficients * modified capillary rheometer * particle size distribution * PIM technology * carbide powder * binder
Subject RIV: BK - Fluid Dynamics
Impact factor: 2.080, year: 2011

Pressure effect on the rheological behaviour of powder–polymer compounds intended for powder injection moulding was determined. A single-piston capillary rheometer modified by addition of a second chamber with a restricting needle valve generating backpressure increasing the pressure in the melted material during the flow through the die was employed to determine pressure sensitivity coefficients. The results obtained for three compounds varying in the characteristics of powders used confirmed that compounds at the loading level close to the maximum packing are more sensitive to pressure than polymer binder. It is shown that pressure sensitivity coefficients of these materials are strongly dependent on powder characteristics - particle size and particle size distribution. The highest coefficient (32.9 GPa−1) was found for compound containing broad particle size distributed powder having a perceptible portion of small particles.
Permanent Link: http://hdl.handle.net/11104/0191465