Microstructural and mechanical characterization of kaolin DD3 after addition of dolomite (5-20% weight) [Caracterisation microstructurale et mecanique de refractaires a base du kaolin DD3 et la dolomite (5-20%poids)]
Résumé
The mixtures between 5 and 20% weight of dolomite were treated and sintered under the same conditions between 1200°C and 1550°C. XRD Spectra show that the addition from 5 to 20% weight of dolomite led, after sintering, to form ceramic composite composed mainly of phases: mullite, anorthite, spinel and indialite (α-cordierite). The addition of dolomite more than 10% reduces the rate of the amorphous phase to 9.6% after sintering in the temperature range 1200°C and 1500°C. Ceramics obtained is characterized by: an apparent density in the range 2,88 to 3,21 g/cm3, a very low porosity, a module of rupture between 67 and 112 MPa and a Vickers microhardness from 9,1 to 10,67 GPa. © Lavoisier.