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Fluidization behavior of graphitized glassy particles in a fluidized carbon bed cooling process for investment casting |
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| Affiliation: | 1. College of Chemical Engineering, Hebei University of Technology, Tianjin 300401, China;2. Qingdao Institue of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China;3. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. School of Railway Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran;1. Process Systems Enterprise, Hammersmith, London, UK;2. Department of Chemical and Biological Engineering, University of Sheffield, UK;3. Process and Chemical Engineering, School of Engineering, University College Cork, Ireland;1. Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China;2. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;3. Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China |
| Abstract: | Fluidized Carbon Bed Cooling (FCBC) is an innovative investment casting process for directional solidification of superalloy components. It takes advantage of a fluidized bed with a base of small glassy carbon beads for cooling and other low-density particles that form an insulating layer by floating to the bed surface. This so-called “Dynamic Baffle” protects the fluidized bed from the direct heat input from the high-temperature heating zone and provides the basis for an improved bed microstructure. The prerequisites for a stable casting process are stable fluidization conditions where neither collapse of the bed nor particle blow out at excessive bubble formation occur.This work aimed to investigate the fluidization behavior of spherical carbon bed material in argon and air at temperatures between 20 to 350 °C. Systematic studies at reduced pressures using the FCBC prototype device were performed to understand the stable fluidization conditions at all stages of the investment casting process. The particle shape factor and size distribution characterization and the measurement of the powder’s minimum fluidization velocity and bed voidage show that this material can be fully utilized as a cooling and buoyancy medium during the FCBC process. |
| Keywords: | Gas–solid fluidization Glassy carbon Reduced pressure Increased temperature Fluidized carbon bed |
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