Resumen:
We have demonstrated by X-ray diffraction a transformation from the t-ZrO2 phase into the m-ZrO2 phase by the presence of multiwall carbon nanotubes (MWCNTs) and graphite powder (GP) in zirconia toughened alumina composites sintered in air. The phase transformation does not occur in sintering under an argon atmosphere. The quantitave phase analysis was carried out by fitting the X-ray diffraction profile with the Rietveld method making use of the FullProf software. The obtained amounts of m-ZrO2 phase by the presence of GP and MWCNTs were 5% and 2.2%, respectively, at a sintering temperature of 1520 degrees C for 1 h. (C) 2012 Elsevier Ltd. All rights reserved.