Exploring the sintering and densification behaviour of multiwalled carbon nanotube reinforced TiO2–MnO2 composites developed by spark plasma sintering

Lephuthing, Senzeni Sipho; Okoro, Avwerosuoghene Moses; Ige, Oladeji Oluremi; Olubambi, Peter Apata

doi:10.1016/j.jallcom.2020.155393

Cited by 6 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An additional shrinkage stage at around 30 minutes is also observed in the pre-annealed samples, which occurs at the lower sintering temperature during the cooling process. This stage correlates with lower shrinkage rates, mass movement, and pore closure [42]. The relative density was studied to demonstrate the densification behaviour of the composites further, and the results are shown in Fig.…”

Section: Resultsmentioning

confidence: 94%

Influence of Pre-Annealing on Densification, Microstructure, and Microhardness of Spark Plasma Sintered TiO2-MnO2 Composites

Mohlala

Olubambi

Cele

et al. 2022

KEM

Self Cite

View full text Add to dashboard Cite

MnO2 and TiO2 composites have garnered substantial research interest for energy applications, including supercapacitor electrodes and photocatalysts. This study investigated the microstructures, densification behaviour, and microhardness of spark plasma sintered TiO2-MnO2 composites. TiO2-MnO2 composites with 10 wt.% MnO2 and 30 wt.% MnO2 were sintered at a temperature of 1000 °C and applied pressure of 25 MPa. To investigate the influence of annealing, the second batch of powders with similar compositions were pre-annealed at a temperature of 500°C for 5 minutes before consolidation. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the powders and compacts. The results revealed that the pre-annealing stage influences the microstructural constituents, densification, and microhardness. The formation of pores and a new phase was observed in SEM images and XRD patterns. The relative densities of the 10wt.%MnO2 sample increased from 97.48 % to 97.71 %, whereas that of the 30wt.%MnO2 composite increased from 96.11% to 96.46%. Similarly, the microhardness values in the pre-annealed 10wt.% MnO2 and 30wt.%MnO2 composites increased by 1.78% and 0.41%, respectively.

show abstract

Section: Resultsmentioning

confidence: 94%