New Al₂O₃–Cu–Ni functionally graded composites manufactured using the centrifugal slip casting

Abstract

The aim of this paper was to establish the general suitability of the centrifugal slip casting technique for fabrication of graded material from the Al 2 O 3-Cu-Ni system. The present investigation is a preliminary one and the obtained results may be regarded as a point for acquiring the new knowledge in the ternary ceramic metal system fabricated using centrifugal slip casting. The rheological study provided the evidence that the suspension used to fabricate composites is a non-Newtonian slurry. Moreover, the results demonstrated that the prepared slurry is stable over time. The obtained composites has a hollow cylindrical shape with relative density of > 95%. The XRD study results revealed three phases: Al 2 O 3 , Ni, and CuNi. The microscopic investigations revealed a nonhomogeneous distribution of the metallic phase in the composite. It has been shown that the content of the metallic phase decreased with the increased distance from the outside to the inner edge of the ceramic-metal composite. The study results allow to conclude that the interface between the phases is more continuous when sintering was carried out in a solid phase. However, it was found that when sintering was carried out in a liquid phase separated metal particles with spherical phase are formed.

Review on developments of bulk functionally graded composite materials

“…While a density of 3.83 g/cc was achieved after positioning impregnation + hot pressing at 1700°C, the FGCM fabricated solely by hot pressing at 1800°C had a density of only 3.58 g/cc. Zygmuntowicz et al [24,228] fabricated Al 2 O 3 –Ni and Al 2 O 3 –Cu–Ni FGCMs via centrifugal slip casting process. Aqueous slurries consisting of metal and ceramic powders were first made and centrifuged.…”

Novel Functionally Gradient Composites Al2O3-Cu-Mo Obtained via Centrifugal Slip Casting

“…Previous work on the production of Al 2 O 3 -Cu-Ni composites by the centrifugal casting method showed that in samples containing 15 vol pct metallic phase about 1 pct of the mass of the metal flows out of the specimens after the sintering process. [27] Therefore, it can be concluded that the addition of Mo in three-component composites with Al 2 O 3 matrix is less effective in preventing the outflow of copper during sintering compared to three-component composites with Al 2 O 3 matrix with the addition of Ni particles.…”

“…[25] The results of our research conducted on composites obtained by slip casting and centrifugal slip casting allowed us to conclude that the addition of the second metallic component, in this case, molybdenum, prevents or limits the escape of liquid copper and may provide better properties of the manufactured composites. [26,27] Thermal analysis and dilatometric research results of the Al 2 O 3 -Cu-Mo composite presented in [28] revealed decomposition and mass were increasing above the temperature of 600°C, which is connected with Cu and Mo oxidation. Higher growth of mass is observed in composites with higher content of the metallic phase.…”

The Potential of Al2O3–ZrO2-Based Composites, Formed via CSC Method, in Linear Infrastructure Applications Based on Their Mechanical, Thermal and Environmental performance

“…So far, the CSC method has been mainly used to fabricate pipes from the ceramic-metal system. [6,7] In this study, the method will be adapted to the fabrication of Al 2 O 3 and ZrO 2 -based shapes. Al 2 O 3 and ZrO 2 -based materials play a key role in high-temperature applications.…”