AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.4 din 2013 | |||||||
Articol: |
SYNTHESIS AND CHARACTERIZATION OF CORDIERITE FOR DIESEL FILTERS. Autori: MARIA GOREA, NICOLAE HAR. |
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Rezumat:
Cordierite, Mg2Al4Si5O18, has a very low thermal expansion coefficient, thus a high resistance to thermal shocks as well as chemical stability at high temperatures. Accordingly, it is used in applications where high resistances to thermal shock are essential; such is the case of diesel particulate filters (DPF). This paper concerns the synthesis of cordierite by using the solid state reaction method starting from raw materials: kaolin, metakaolin and talc. The ceramics fired at 1300˚C and 1350 ˚C were submitted to chemical attack by an alkaline mixture (one mole Na2CO3 with 1.5 moles SiO2) under so-called “less-severe” conditions, i.e., 900˚C and then under “severe” conditions at 1000˚C for 5 minutes. The SEM images evidence less corrosion in the first case, and slight corrosion features under the circumstance of the “severe” attack. Keywords: cordierite, ceramics, chemical attack
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