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Title: Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide

Highlights: • Waste MoSi{sub 2} heating elements were used as starting material for fabrication of porous acicular mullite. • Calcined MoSi{sub 2} powder was source of SiO{sub 2} and pore former at the same time. • Porous acicular mullite is promising material for filtration of diesel engine exhaust. • Samples with decent mechanical integrity and porosity of more than 60% were fabricated. - Abstract: Porous acicular mullite was fabricated by using waste MoSi{sub 2} heating element and Al{sub 2}O{sub 3}. Careful calcination of the pulverized heating element led to the formation of a mixture of MoO{sub 3} and amorphous SiO{sub 2}. This mixture was employed as both SiO{sub 2} precursor and pore former. The oxidation of MoSi{sub 2} and mullite formation were studied. The effect of fabrication temperature on phase composition, porosity, grain morphology, and compressive strength of sintered mullite was examined. Pure mullite with porosity of more than 60% and compressive strength of ∼20 MPa was obtained at temperature as low as 1300 °C. The microstructure consisted of elongated, rectangular, prism-like grains which are known to be effective in filtration of diesel engine exhaust. The increase in sintering temperature caused the change of grain morphology and reduction in compressivemore » strength.« less
Authors:
 [1] ;  [2] ;  [1]
  1. Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade 11001 (Serbia)
  2. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade 11120 (Serbia)
Publication Date:
OSTI Identifier:
22345208
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 50; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; CALCINATION; CERAMICS; COMPRESSION STRENGTH; CRYSTAL GROWTH; DIESEL ENGINES; MICROSTRUCTURE; MOLYBDENUM; MOLYBDENUM OXIDES; MOLYBDENUM SILICIDES; MULLITE; OXIDATION; POROUS MATERIALS; SILICA; SILICON OXIDES; SINTERING; X-RAY DIFFRACTION