Influence of feedstock preparation on ceramic injection molding and microstructural features of zirconia toughened alumina |
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Affiliation: | 1. Department of Metallurgy and Materials Science, Hanyang University, Ansan 426-791, Republic of Korea;2. Eco Materials & Processing Department, Korea Institute of Industrial Technology, Incheon 406-840, Republic of Korea;1. Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang 790-784, Republic of Korea;2. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea;3. Korea Institute of Materials Science (KIMS), 66, Changwon-ro, Sangnam-dong, Changwon, Gyeongnam 641-831, Republic of Korea;4. School of Aerospace & Mechanical Engineering, Korea Aerospace University, 76, Hanggongdaehang-ro, Goyang-si, Gyeonggi-do 412-791, Republic of Korea;5. Department of Mechanical Design Engineering, Andong National University, 1375 Gyeongdong-ro, Andong-si, Gyeongsangbuk-do 760-749, Republic of Korea |
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Abstract: | Feedstocks for ceramic injection molding of ZTA containing 90 vol.% of sub-μm alumina and 10 vol.% of zirconia nanopowder were prepared by different processing techniques. Feedstocks were prepared by mixing in a sigma-blade kneader and subsequent homogenizing by twin-screw extrusion or shear roll compaction. Two other feedstocks were previously bead milled and subsequently processed by the same procedure. Compounding technology strongly influences the injection molding behavior and microstructures of the final product. Despite higher energy input of the shear roll compactor, powder agglomerates cannot be completely avoided. Pre-milling is effective to disperse and deagglomerate ceramic powders. Injection pressures of feedstocks from pre-milled powders were about 200 bar lower compared to pressures needed for non-milled feedstocks. Present feedstock preparation methods are feasible to produce homogeneous feedstocks, which strongly influence microstructures. In order to produce high solid loaded sub-μm/nm feedstocks, processing methods, pre-treatment and solid content have to be carefully chosen. |
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Keywords: | Feedstock Mixing technique Injection molding CIM Microstructure |
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