Abstract
This paper focuses on the verifying the possibility of producing Al2O3-ZrO2 composite pipes with a gradient structure using centrifugal slip casting method. The aim of the research is to define the correlation between the rheological properties of aqueous suspensions of ceramic powders with different solid loading and obtaining the ZrO2 phase gradient in the Al2O3 matrix. Such products, due to their unique properties, can be utilized in the transport of aggressive substances, even in extreme temperature or corrosive conditions. The suspensions and the sintered samples were characterized by: broad rheological analysis, scanning electron microscopy, X-ray diffraction, stereological analysis and Vickers hardness tests. The study reports on a series of samples produced of ceramic suspensions (70 vol.% Al2O3–30 vol.% ZrO2) differing in the total solid loading in the range of 30–55 vol.%. The results clearly indicate that obtaining the gradient structure of ceramic-ceramic composite pipes is closely related to the rheological properties of the suspensions from which the samples are cast. The phase gradient is obtainable from suspensions 30–40 vol.%, in which the possibility of moving ZrO2 particles relative to the Al2O3 is quite high—these suspensions are characterized by low viscosity and the dominance of viscous over elastic properties (G′ > G″).
Highlights
An increase in the solid loading significantly increases the viscosity of the suspensions: the greatest differences in the viscosity increasing were noted when changing the
The oscillation tests indicated that the suspensions with a solid loading in the range of 30 vol.% to 40 vol.% are characterized by the dominance of viscous over elastic properties (G0 < G00 )
When the powder content is ≥45 vol.% the elastic properties dominate (G0 > G00 ), which proves the creation of a fairly strong 3D structure based on ceramic powder particle-ceramic powder particle and ceramic powder particle–water molecule interactions
Summary
As a result of the close-knit cooperation of researchers from all over the world and the resulting synergy, new fields of science have been created. One such example is, for instance, the field of composite materials. The combination of Al2 O3 and ZrO2 enables the establishment of material Zirconia Toughened Alumina (ZTA) [2,3]. This is a composite material where alumina is toughened with zirconia.
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