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  4. Understanding centrifugal casting in the manufacture of functionally graded materials
 
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Understanding centrifugal casting in the manufacture of functionally graded materials

Publikationstyp
Journal Article
Date Issued
2022-12
Sprache
English
Author(s)
Florenciano, Jessica Tatianne Ortiz  
Ambrosi, Alan  
Hotza, Dachamir  
González, Sergio Yesid Gómez  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-URI
http://hdl.handle.net/11420/14453
Journal
Journal of the European Ceramic Society  
Volume
42
Issue
15
Start Page
7089
End Page
7101
Citation
Journal of the European Ceramic Society 42 (15): 7089-7101 (2022-12)
Publisher DOI
10.1016/j.jeurceramsoc.2022.08.042
Scopus ID
2-s2.0-85138442861
Centrifugal casting is a shaping technique intended for ceramic tubular structure manufacture, where the particle size and density are exploited to produce asymmetrical membranes and functionally graded materials. However, some well-established insights about particle segregation are debatable and remain unclear. For instance, small particles do not necessarily stay in the inner region, and the bigger particles do not accumulate in the outer. Herein several manufacturing parameters were studied through Taguchi's robust design, using discrete element method-based simulations to generate the data. Alumina powder was used as model material and water as the liquid phase, to assess the green cast formation time, the cast thickness, the roundness, the changes in relative density, and particle size distribution along the cast's cross-section. The mean particle diameter and the rotation speed are the most influential parameters for the casting time. The volume fraction of solids on the precursor slurry is decisive regarding the cast structural properties, and particle segregation is negligible, except for size differences above one order of magnitude. When a fraction of denser nickel powder was added, density segregation was also observed, but the size differences can overshadow its effect. In addition, alumina and nickel particles were cast in a lab-scale centrifuge and experimentally validated the segregation of particles. The centrifugal casting method was successfully applied for producing the Al2O3-Ni composites with a gradient distribution of the Ni phase.
Subjects
Centrifugal casting
Discrete element method
Functionally graded materials
Hierarchically structured materials
Size segregation
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