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Comparison of Erosion Rate of Slip Cast Monolithic and Composite Ceramics

In this paper, the solid particle erosion wear of slip cast monolithic alumina (Al2O3) and alumina– zirconia (Al2O3–ZrO2) composite ceramics was investigated. Three groups of samples were prepared: (i) monolithic alumina (Al2O3) ; (ii) composite alumina–zirconia (Al2O3–ZrO2) containing 99 wt. % Al2O3 and 1 wt. % ZrO2 and (iii) composite alumina–zirconia (Al2O3–ZrO2) containing 90 wt. % Al2O3 and 10 wt. % ZrO2. X-ray diffraction and scanning electron microscopy (SEM) were used to investigate the phase composition, the crystallite size, and the morphology of the sintered monolithic and composite ceramic samples. The erosive wear behaviour was studied under different impact angles (30°, 60°, 90°) of silicon carbide (SiC) particles as erodent. Erosion mechanisms of all prepared ceramic samples were evaluated by measuring the surface roughness parameters (Ra, Rz, and Rmax) and the erosion rate. The obtained results showed that the tribological properties of the monolithic Al2O3 can be improved with the addition of ZrO2. It was found that the erosion resistance increases with the increasing amount of ZrO2 in the composite Al2O3–ZrO2 ceramics. It was found that ZrO2 grains are homogenously distributed in the alumina matrix, zirconia grain size is smaller than alumina grains, and that the alumina grain size is reduced by the addition of zirconia.

slip casting ; erosion rate ; monolithic alumina ; alumina–zirconia composite ceramics

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