Journal of Materials Research

Articles

Degradation resistance of silicon carbide diesel particulate filters to diesel fuel ash deposits

D. O’Sullivana1, M.J. Pomeroya2, S. Hampshirea3 and M.J. Murtagha4

a1 Materials Ireland Research Centre, University of Limerick, Limerick, Ireland

a2 Materials and Surface Science Institute, University of Limerick, Limerick, Ireland

a3 Materials Ireland Research Centre, University of Limerick, Limerick, Ireland, and Materials and Surface Science Institute, University of Limerick, Limerick, Ireland

a4 Corning Incorporated, Corning, New York 14831

Abstract

A series of experiments were conducted to investigate chemical interactions between silicon carbide (SiC) and synthetic ash compositions expected to be deposited on the surfaces and within the pore structure of a diesel particulate filter. The chosen ash compositions simulated those arising from lubricants and three fuel types: standard diesel, diesel containing ferrocene as a catalytic additive, and diesel containing a cerium-based catalyst. Results demonstrated that SiC suffered little chemical or oxidative degradation in the presence of the ashes at 900 °C. For the ash not containing Fe or Ce, ash sintering effects were a possible mechanism causing filter blockage at temperatures above 970 °C. For ashes containing Fe or Ce, appreciable sintering effects were not observed below 1100 °C. Based upon the work conducted the suitability of SiC as a construction material for diesel particulate filters is not compromised by chemical degradation in the presence of lubricant/additive derived ash at temperatures less than 1100 °C.

(Received January 07 2004)

(Accepted June 02 2004)

(Online publication October 2004)

Key Words:

  • Ceramic;
  • Chemical reactivity;
  • Environmentally protective
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