Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide
Abstract
Porous acicular mullite was fabricated by using waste MoSi2 heating element and Al2O3. Careful calcination of the pulverized heating element led to the formation of a mixture of MoO3 and amorphous SiO2. This mixture was employed as both SiO2 precursor and pore former. The oxidation of MoSi2 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 similar to 20 MPa was obtained at temperature as low as 1300 degrees 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 compressive strength.
Keywords:
ceramics / oxides / crystal growth / X-ray diffraction / microstructureSource:
Materials Research Bulletin, 2014, 50, 155-160Publisher:
- Pergamon-Elsevier Science Ltd, Oxford
Funding / projects:
- Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45012)
DOI: 10.1016/j.materresbull.2013.10.044
ISSN: 0025-5408
WoS: 000331920500025
Scopus: 2-s2.0-84888191006
Institution/Community
Tehnološko-metalurški fakultetTY - JOUR AU - Bučevac, Dušan AU - Dapčević, Aleksandra AU - Maksimović, Vesna PY - 2014 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2765 AB - Porous acicular mullite was fabricated by using waste MoSi2 heating element and Al2O3. Careful calcination of the pulverized heating element led to the formation of a mixture of MoO3 and amorphous SiO2. This mixture was employed as both SiO2 precursor and pore former. The oxidation of MoSi2 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 similar to 20 MPa was obtained at temperature as low as 1300 degrees 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 compressive strength. PB - Pergamon-Elsevier Science Ltd, Oxford T2 - Materials Research Bulletin T1 - Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide EP - 160 SP - 155 VL - 50 DO - 10.1016/j.materresbull.2013.10.044 ER -
@article{ author = "Bučevac, Dušan and Dapčević, Aleksandra and Maksimović, Vesna", year = "2014", abstract = "Porous acicular mullite was fabricated by using waste MoSi2 heating element and Al2O3. Careful calcination of the pulverized heating element led to the formation of a mixture of MoO3 and amorphous SiO2. This mixture was employed as both SiO2 precursor and pore former. The oxidation of MoSi2 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 similar to 20 MPa was obtained at temperature as low as 1300 degrees 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 compressive strength.", publisher = "Pergamon-Elsevier Science Ltd, Oxford", journal = "Materials Research Bulletin", title = "Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide", pages = "160-155", volume = "50", doi = "10.1016/j.materresbull.2013.10.044" }
Bučevac, D., Dapčević, A.,& Maksimović, V.. (2014). Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide. in Materials Research Bulletin Pergamon-Elsevier Science Ltd, Oxford., 50, 155-160. https://doi.org/10.1016/j.materresbull.2013.10.044
Bučevac D, Dapčević A, Maksimović V. Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide. in Materials Research Bulletin. 2014;50:155-160. doi:10.1016/j.materresbull.2013.10.044 .
Bučevac, Dušan, Dapčević, Aleksandra, Maksimović, Vesna, "Porous acicular mullite obtained by controlled oxidation of waste molybdenum disilicide" in Materials Research Bulletin, 50 (2014):155-160, https://doi.org/10.1016/j.materresbull.2013.10.044 . .