Alumina Membrane Development with Carbon Fiber as Porosity Precursor

Abstract:

Alumina membrane for microfiltration has been studied by introduction of carbon fiber as porogenic agent. Ceramic membranes have advantages due to its inert chemical and resistance to relatively high temperatures, however, being porous, tend not to withstand high pressures. This work investigates the possibility of introducing carbon fibers so, after firing, rest communication channels and owing to the increased probability of contact between fibers, achieve high permeability with maintaining the mechanical strength. Formulations were proposed with variations of fiber length, concentration and burn at two temperatures. They were characterized by linear shrinkage, porosity, density, permeability, 3 points flexural strength, SEM and MicroCT. The Taguchi method correlated the parameters: fiber length, fiber concentration and burn temperature and validated by ANOVA. The combination that best met the commitment was 3% v/v of 1mm fibers and burnt at 1500°C, with Darcyana permeability of 3.44 10^-15m2 and fracture stress of 56.27MPa.

• Periodical: Materials Science Forum (Volume 912)
• Pages: 245-250
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.912.245
• Online since: January 2018
• Authors: Cíntia Rejane Consonni, Roberto Hideaki Tsunaki, Carlos Alberto Fortulan
• Keywords: Carbon Fiber, Ceramic Membrane, Permeability, Taguchi Method

References

[1] G.G. Prado: Projeto e caracterização de membranas cerâmicas utilizando microfibras como precursoras de porosidade. Mestrado (Dissertação). São Carlos, 2014. Universidade Federal de São Carlos (UFSCar). SP.

DOI: 10.11606/d.18.2014.tde-25052015-091114

[2] R. Del Colle, C.A. Fortulan, S.R. Fonte: Ceramics International Vol 37 (2011), p.1161.

[3] A.R. Studart et al.: Journal of the American Ceramic Society Vol. 89 (6) (2006), p.1771. (ISSN 0002-7820).

[4] R. Del Colle, C.A. Fortulan, S.R. Fonte: Desalination Vol. 245 (1-3) (2009), p.527. (ISSN 0011-9164).

[5] M.D.M. Innocentini et al.: American Ceramic Society Bulletin Vol. 81 (7) (2002), p.34. (ISSN 0002-7812).

[6] H. Unal et al.: Journal of the Brazilian Society of Mechanical Sciences and Engineering (2015), p.1. (ISSN 1678-5878).

[7] ASTM C373-88: Standard Test Method for Water Absorption, Bulk Density, Apparent Porosity and Apparent Specific Gravity of Fire Whiteware Produtcts, ASTM International, West Conshohocken, PA, 2008, http: /www. astm. org.

DOI: 10.1520/c0373-14

[8] ASTM C1161-02c: Standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperatures, ASTM International, West Conshohocken, PA, 2008, http: /www. astm. org.

DOI: 10.6028/nist.ir.89-4127

[9] V.R. Salvini, M.D.M. Innocentini, V. Pandolfelli: Cerâmica Vol. 48 (307) (2002), p.121.