The role of Aluminium in the synthesis of Mesoporous 4H Silicon Carbide

Jeanette Hvam, Per Morgen, Terence Edwin Warner, Eivind Morten Skou, Thomas Wolff

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Aluminium was found to play a key role in the process of forming a mechanically stable and highly porous, granular structure of 4H silicon carbide. The material was prepared by a high temperature reaction of the elemental constituents. The reactions were carried out under different background atmospheres, including nitrogen. Ternary carbides containing Al, Si and N were formed in the process, and these are believed to be responsible for the final outcome of the process at the highest reaction temperatures, in the form of pure well-connected grains of 4H-SiC, forming a strong and rigid microstructure with high porosity. The Al containing compounds function as structural promoters for the 4H polytype recrystallization. This is expected − and was partly shown − to take place through substitution with 4H-SiC and the evaporation of all other constituents during the high temperature sintering step. When extruded into a honeycomb structure, this sintered pure mesoporous SiC final product turns out to be ideal for a combined diesel particulate filter with support for catalysts in the pores.

Original languageEnglish
JournalMaterials Science Forum
Volume821-823
Pages (from-to)970-973
ISSN0255-5476
DOIs
Publication statusPublished - 2015
Event10th European Conference on Silicon Carbide and Related Materials - Grenoble, France
Duration: 21. Sep 201425. Sep 2014
Conference number: 10

Conference

Conference10th European Conference on Silicon Carbide and Related Materials
Number10
Country/TerritoryFrance
CityGrenoble
Period21/09/201425/09/2014

Keywords

  • Catalyst support
  • Diesel particulate filter
  • Liquid phase sintering
  • Mesoporous

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