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

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

Publikation: Bidrag til tidsskriftKonferenceartikelForskningpeer review

Abstrakt

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.

OriginalsprogEngelsk
TidsskriftMaterials Science Forum
Vol/bind821-823
Sider (fra-til)970-973
ISSN0255-5476
DOI
StatusUdgivet - 2015
Begivenhed10th European Conference on Silicon Carbide and Related Materials - Grenoble, Frankrig
Varighed: 21. sep. 201425. sep. 2014
Konferencens nummer: 10

Konference

Konference10th European Conference on Silicon Carbide and Related Materials
Nummer10
Land/OmrådeFrankrig
ByGrenoble
Periode21/09/201425/09/2014

Emneord

  • Mesoporous
  • silicon carbide
  • liquid phase sintering
  • diesel particulate filter
  • catalyst support

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