Effect of Variation MWCNTs in Synthesis Zirconia Prepared by Uniaxial Pressed Technique

Abstract

Abstract The effect of addition different weight percentage (wt. %) of treated MWCNTs on zirconia matrix as a composite structure using method uniaxial pressed for fabrication and enhancement mechanical, microstructural properties of zirconia have been investigated in the present study. The composite material have prepared by adding yttrium oxide (3% mol. Y2O3) to zirconia for stabilized in the tetragonal phase with homogeneous distribute and reinforcement changed weight percentage of (2%, 5%, 7%, and 10%) wt. of F-MWCNTs to result (3% mol.Y2O3-ZrO2/F-MWCNTs) nanocomposite samples by pressing uniaxiall at pressure of (624) MPs in the metal-die cylinder to results pellets of (10 mm diameter). The resulting pellets were sintered in air at (1550 °C) temperatures for two hours. The samples were characterized by XRD analysis to demonstrate the phase composition of samples, where The retention was observed on the tetragonal phase in zirconia and the microstructure of the materials have been studied using SEM it is observed that F-MWCNTs were homogeneously distributed in the composite powders without the formation of ropes and bundles up to the highest contents of F-MWCNTs, and EDS showed the percentages for presence of carbon in samples, The micro hardness was studied by Vickers indentation method and Brazilian test that shows improved due to a homogeneous distribution of MWCNT in ZrO2 and the densities (Green, Bulk, and theoretical), porosity and liner shrinkage to demonstrate the toughness that reveal many pores and low densification with increasing F-MWCNTs contents, physical and mechanical properties of samples depend on distribution of F-MWCNTs in the matrix.