Optimization of powder injection molding of feedstock based on aluminum oxide and multicomponent water‐soluble polymer binder |
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| Authors: | Berenika Hausnerova Lucie Marcanikova Petr Filip Petr Saha |
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| Affiliation: | 1. Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, TGM 275, 762 72 Zlín, Czech Republic;2. Department of Mechanics of Fluids and Disperse Systems, The Institute of Hydrodynamics, Academy of Sciences of the Czech Republic, Pod Patankou 5, 166 12 Prague, Czech Republic |
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| Abstract: | Analyses crucial to optimize powder injection molding of feedstock based on aluminum 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 methods. Further, the rheological model is developed to describe the flow behavior 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 andcombined solvent/thermal. The quality of the final sintered parts is demonstrated on scanning electron microscopic images of their surfaces. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers |
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