Optimization of powder injection molding of feedstock based on aluminum oxide and multicomponent water-soluble polymer binder

0360644 - ÚH 2012 RIV US eng J - Journal Article
Hausnerová, B. - Marcaníková, L. - Filip, Petr - Sáha, P.
Optimization of powder injection molding of feedstock based on aluminum oxide and multicomponent water-soluble polymer binder.
Polymer Engineering and Science. Roč. 51, č. 7 (2011), s. 1376-1382. ISSN 0032-3888. E-ISSN 1548-2634
R&D Projects: GA ČR GA103/08/1307
Institutional research plan: CEZ:AV0Z20600510
Keywords : powder injection molding * viscosity * thermogravimetric analysis
Subject RIV: BK - Fluid Dynamics
Impact factor: 1.302, year: 2011

Analyses crucial to optimize powder injection molding of feedstock based on aluminium oxide powder and multicomponent polymeric binder are provided with the aim to obtain defect-free, high density parts.As the critical step of the process is the flow of highly filled (60 vol.%) compound into a mold cavity, rheological properties supplemented by thermal and pressure-volume-temperature characteristics are measured and described.Upon shear deformation the feedstock undergoes structural changes, which are quantified in terms of yield stresses obtained using Herschel-Bulkley and Casson models.Further, the rheological model is developed to describe the flow behaviour of the feedstock in the whole shear rate range measured.Thermogravimetric analysis is performed to optimize debinding step of the process, and two possible ways of the binder removal are proposed – purely thermal and combined solvent/thermal.The quality of the final sintered parts is demonstrated on SEM images of their surfaces.
Permanent Link: http://hdl.handle.net/11104/0198145