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Improved properties of the monolithic alumina ceramics

Alumina (Al2O3) is an exceptionally important ceramic material and one of the most widely used advanced ceramics. Because of their excellent properties (like high hardness, chemical inertness, wear resistance and a high melting point), alumina ceramics are widely used for refractory materials, grinding media, cutting tools and high temperature bearings. In the past fifteen years, a number of papers on corrosion, mechanical and tribological properties of advanced ceramics have been published. Mechanical and tribological properties of alumina can be improved by addition of t-ZrO2 (Figure 1). Disadvantage of zirconia is its low thermal conductivity. In a tribological contact, frictional heating occurs, and this low thermal conductivity causes thermally induced crack formation, followed by severe wear processes. Alumina has a thermal conductivity that is at least 3 times higher than that of zirconia. Improved properties of the monolithic alumina ceramics can be obtained by the incorporation of zirconia (ZrO2) particles in the matrix of alumina ceramics in order to produce advanced Al2O3-ZrO2 composite ceramics.

Alumina ; Zirconia ; Composite ceramics ; Mechanical properties ; Tribological properties

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