The Role of Aluminium in the Synthesis of Mesoporous 4H Silicon Carbide

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

doi:10.4028/www.scientific.net/MSF.821-823.970

Paper Titles

Tuning the Terrace and Step Stability of 6H-SiC (0001) for Graphene Film Deposition
p.953

Raman Spectra and Strain Uniformity of Epitaxial Graphene Grown on SiC(0001)
p.957

On the Formation of Graphene by Ge Intercalation of a 4H-SiC Surface
p.961

Si NWs Conversion to Si-SiC Core-Shell NWs by MBE
p.965

The Role of Aluminium in the Synthesis of Mesoporous 4H Silicon Carbide
p.970

Synthesis and Characterization of Al₄SiC₄: A “New” Wide Band Gap Semiconductor Material
p.974

Silicon Growth on 3C-SiC(001)/Si(001): Pressure Influence and Thermal Effect
p.978

Influence of Diamond CVD Growth Conditions and Interlayer Material on Diamond/GaN Interface
p.982

Electrical Properties of Graphene Contacts to AlGaN/GaN Heterostructures
p.986

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The Role of Aluminium in the Synthesis of Mesoporous 4H Silicon Carbide

Abstract:

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