Effect of the sintering temperature on microstructure and properties of Al₂O₃–Cu–Ni hybrid composites obtained by PPS

Abstract

In the present research, the influence of sintering temperature on the microstructure and properties of Al2O3–Cu–Ni hybrid composites prepared by the Pulse Plasma Sintering (PPS) technique were described. In this research, three temperatures have been selected: 1250°C, 1300°C, and 1350°C. SEM observations were carried out to determine the distribution of the metallic phase in the composite depending on the sintering temperature. The conducted experiments and microscopic observations enabled a better understanding of the phenomena occurring between the ceramic matrix and metallic phase in the obtained materials. The mechanical properties like a hardness and fracture toughness were measured. The technology applied allowed us to obtain ceramic‐metal composites with a homogeneous microstructure. It was found that the sintering temperature influences the selected physical and mechanical properties of the composites produced. It was found that samples produced at 1300°C are characterized by the highest relative density and the mechanical properties.

Incorporating sugarcane bagasse ash into Al2O3 ceramic tapes

“…We observed that the SiO 2 peak positions are following the literature 43,44,45 . The α‐alumina phase comes from the powder Al 2 O 3 , which is in agreement with the results found in the literature 46,47,48 . We only noticed the presence of the α‐alumina phase in the sintered tape, considering that SiO 2 served as a flux to reduce the sintering temperature 49,50 …”

“…43,44,45 The α-alumina phase comes from the powder Al 2 O 3 , which is in agreement with the results found in the literature. 46,47,48 We only noticed the presence of the α-alumina phase in the sintered tape, considering that SiO 2 served as a flux to reduce the sintering temperature. 49,50 Figure 2B shows a representative SEM image taken from the SCBA waste.…”

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

“…On the other hand, as mentioned in the Introduction, the temperature of consolidation achieved in the PPS process is higher than in the traditional sintering method [ 38 , 39 ]. Because of that, 1500 °C was the higher applied temperature of the process.…”

“…In this technique, the material was heated by electric pulses generated periodically by a discharged capacitor battery and, at the same time, subjected to uniaxial pressing. The application of a capacitor battery as a source of electrical energy allows the electric pulses to be produced periodically over several hundred microseconds and a current intensity of about 100 kA [ 38 , 39 ]. Through the short duration of the electric pulse related to the time interval between the individual pulses, the temperature achieved during the pulse is higher than that stabilized during the traditional sintering method [ 38 , 39 ].…”

“…The application of a capacitor battery as a source of electrical energy allows the electric pulses to be produced periodically over several hundred microseconds and a current intensity of about 100 kA [ 38 , 39 ]. Through the short duration of the electric pulse related to the time interval between the individual pulses, the temperature achieved during the pulse is higher than that stabilized during the traditional sintering method [ 38 , 39 ]. The temperature of the specimen and its heating rate are regulated by controlling the energy dissipated through the electric pulses, including adjusting the intervals between consecutive pulses.…”