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Rheological behavior of zirconia feedstock flowing through various channels considering wall-slip
Affiliation:1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;2. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150080, China;1. Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea;2. Department of Dental Laboratory, Wonkwang Health Science University, Iksan 54538, Republic of Korea;3. Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden 80401, USA;4. Korea Aerospace University, Department of Materials Engineering, Goyang-si 10540, Republic of Korea;1. Institute of Mechatronic Engineering, National Taipei University of Technology, 1, Section 3, Zhongxiao E. Rd., 106 Taipei, Taiwan;2. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, 1, Section 3, Zhongxiao E. Rd., 106 Taipei, Taiwan;3. School of Dental Technology, Taipei Medical University, 250 Wu-Xing Street, 110 Taipei, Taiwan;1. CW Chu College, Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, PR China;2. Guangdong Provincial Key Laboratory of Materials for High Density Electronic Packaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, PR China;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta 30332, USA;1. School of Chemistry and Materials Science, Shanxi Normal University, Linfen, Shanxi 041004, China;2. Science Experiment Center, Yuncheng University, Yuncheng, Shanxi 044000, China;3. Department of Applied Chemistry, Yuncheng University, Yuncheng, Shanxi 044000, China
Abstract:The existence of wall slip for ZrO2 feedstock flow in micro powder injection molding was investigated based on capillary rheometer experiments using dies of three dimensions. A power law function was derived by data fitting to determine the wall slip velocity based on which numerical simulation was carried out to explore the influence of wall slip on micro injection molding. Experimental results indicate that the feedstock is less sensitive to temperature fluctuation at higher shear rates. Power-law model can provide higher accuracy than the modified Cross model to depict the rheological behavior of the feedstock in capillary flows with different channels. Numerical simulation results show that in case of steady flow higher dynamic viscosity of the feedstock and higher pressure losses of the flow appeared when the wall slip boundary was included as compared to no-slip assumption in micro powder injection molding. This is because that when the wall slip boundary was included the shear rate distribution of the feedstock was lower than that of the feedstock assuming no-slip boundary.
Keywords:Micro powder injection molding  Zirconia powder  Wall-slip  Numerical simulation  Viscosity
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