engleski

Erosion mechanisms of slip cast composite Al2O3-ZrO2 ceramics

In this paper highly concentrated (70 wt. %) aqueous Al2O3 and Al2O3–t-ZrO2 suspensions were prepared. Dispersant DOLAPIX CE64 was used for stabilization. Green bodies were formed by slip casting process in plaster mould. After drying, green bodies were sintered at a temperature of 1650 °C. SEM-EDS analysis of prepared samples confirmed the homogeneous distribution of ZrO2 in Al2O3 matrix. Erosive wear resistance of sintered monolithic Al2O3 and composite Al2O3–t-ZrO2 ceramics was determined by SEM analysis of the sample surface morphology before and after erosion at impact angle of 90° and SiO2 as erodent particles. Surface morphology analysis after erosion showed that wear scars were significantly larger on Al2O3 than on Al2O3–t-ZrO2 samples. All conducted tests showed that tribological properties of monolithic Al2O3 can be improved with the addition of t-ZrO2.

Al2O3; Al2O3-t-ZrO2; slip casting; solid particle erosion

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