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Influence of Composition and Coking Temperature on the Properties and Microstructure of Carbon Bonded Al2O3–C Filter Materials


  • The authors thank Dipl.-Ing. C. Segel for the scanning electron microscopy investigations, Mr. H. Wagler for the sample fabrication, Mrs. C. Ludewig for the support in preparation and Mrs. J. Höhne for the refractoriness under load tests. The studies were carried out with financial support from the Deutsche Forschungsgemeinschaft (DFG) within Collaborative Research Center SFB 920, Project C02.


To characterize the physical and mechanical properties of carbon-bonded Al2O3–C filter materials at room and high temperature up to 1600 °C, the influence of the amount of binder and the development of the microstructure during coking were analyzed. The bulk samples were manufactured through a slurry route and afterwards pressed uniaxially. The amount of Carbores® P binder was varied within 5 to 30 wt.% and the samples were coked at temperatures of 800 °C and 1400 °C. Afterwards, the physical (bulk density, open porosity, shrinkage and mechanical properties (cold crushing strength (CCS), cold modulus of rupture (CMOR), refractoriness under load) were determined. The CCS and CMOR values increased with increasing binder content and the results of the refractoriness under load tests show lower thermal expansion and earlier softening of the samples coked at 800 °C.

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