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    STUDIA CHEMIA - Issue no. 4 / 2013  
         
  Article:   SYNTHESIS AND CHARACTERIZATION OF CORDIERITE FOR DIESEL FILTERS.

Authors:  MARIA GOREA, NICOLAE HAR. 		 
       
         
  Abstract:   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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