Open AccessStructure, phase composition and properties of vacuum pressureless sintered ZrO2-based composites reinforced with carbon nanotubes
Author(s) -
Andrey Leonov,
Jing Li,
М. П. Калашников,
Maxim Rudmin,
О. Л. Хасанов
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1100/1/012049
Subject(s) - materials science , sintering , composite material , carbon nanotube , cubic zirconia , phase (matter) , monoclinic crystal system , tetragonal crystal system , zirconium , yttria stabilized zirconia , ceramic , metallurgy , crystal structure , chemistry , organic chemistry , crystallography
In this work, composites based on 3 mol. % yttria-stabilized zirconia (3YSZ) with additives of 1, 5 and 10 wt. % multi-walled carbon nanotubes (MWCNT) were investigated. Samples were obtained by cold pressing followed by vacuum pressureless sintering at a temperature of 1500 °C. It was found that MWCNTs retain their structure after high-temperature sintering, they are located along the zirconia grain boundaries and they lead a grain refining effect for zirconia matrix. Nanotubes can significantly affect the phase composition of composites. Additives 5 wt. % and 10 wt. % MWCNT partially limits the monoclinic-tetragonal phase transition of ZrO 2 and leads to the formation of a new phase of zirconium carbide. An increase of MWCNTs content in composites leads to a smooth decrease of the relative density from 99.2 % to 81.2 %. To obtain fully dense 3YSZ/MWCNT composites, longer sintering at higher temperatures is required compared to the conditions for sintering 3YSZ ceramics without additives.