Abstract
The scope of work included the fabrication of ceramic-metal composites from the Al2O3-Cu and Al2O3-Cu-Mo and examining their microstructure and selected properties. The composites were fabricated by the slip casting method. The rheological behavior, microstructures, X-ray analysis, and mechanical properties were investigated. The rheological study demonstrated that all of the obtained slurries were non-Newtonian shear diluted fluids and stability on time. In both slurries, the flow limit is close to 0 Pa, which is very beneficial when casting the suspensions into molds. The X-ray analysis reveals Al2O3, Cu, and Mo phases in all specimens. No new phases were found in both types of composites after the sintering process. The results provided that the hardness for Al2O3-Cu-Mo composites was equal to 10.06 ± 0.49 GPa, while for Al2O3-Cu, it was equal to 6.81 ± 2.08 GPa. The K1C values measured, with the use of Niihara equation, for composites with and without the addition of Mo were equal to 6.13 ± 0.62 MPa m0.5 and 6.04 ± 0.55 MPa m0.5, respectively. It has been established that the mean specific wear rates of Al2O3-Cu and Al2O3-Cu-Mo samples were 0.35 × 10–5 ± 0.02 mm3 N−1 m−1 and 0.22 × 10–5 ± 0.04 mm3 N−1 m−1, respectively. It was found that molybdenum addition improved wear resistance properties of the composites.Graphical abstract
Highlights
One of the most challenging objectives in modern engineering is the continuous design and development of advanced materials for high-performance applications
The obtained results show that both suspensions may be suitable for forming composites by the slip casting method since they are stable for a minimum of 2 h from the moment of mass preparation
Based on the sedimentation test, it can be concluded that both suspension examinations in the investigation may be suitable for forming composites by the slip casting method since they are stable for a minimum of 2 h from the moment of mass preparation
Summary
One of the most challenging objectives in modern engineering is the continuous design and development of advanced materials for high-performance applications. In comparison to the metals, in combination with high sensitivity for the presence of flaws in the structure effectively exclude ceramics from high-performance applications. A lot of attention has been paid to composites [4,5,6,7] This group of composites successfully combines the advantageous properties of individual components—ceramic and metal—allowing to obtain new material with completely different, promising properties with a wide range of possible applications. For this reason, fabrication of ceramic-metal composites still constitutes a research field addressing a lot of interest [1,2,3]
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