Paper Title:
High Temperature Oxidation of Cr-ZrO2-Al2O3 Composite Fabricated by Mechanical Alloying and Spark Plasma Sintering
  Abstract

The high temperature oxidation resistance of Cr-ZrO2-Al2O3 composites fabricated by mechanical alloying and spark plasma sintering (SPS) has been evaluated. Composite powders were prepared by ball milling Cr-5vol%ZrO2-50vol%Al2O3 powder mixtures. Powders were compacted by SPS in less than 5 min, so that a particular metal-ceramic interpenetrating network is obtained. High temperature oxidation tests (900-1100 0C) in air have revealed good oxidation resistance (1.8, 2.6 and 15.3 mg/cm2 at 900, 1000 and 1100 °C, respectively) due to a protective Cr2O3 layer. EDX analysis revealed that Cr diffusion takes place at 1100 oC from the bulk towards the composite surface leading to Cr depletion at near-surface zones. Chromium contained in the bulk tends to oxidize through oxygen diffusion apparently occurring along the grain boundaries.

  Info
Periodical
Edited by
H. Balmori-Ramírez, M. Brito, J.G. Cabañas-Moreno, H.A. Calderón-Benavides, K. Ishizaki and A. Salinas-Rodríguez
Pages
129-134
DOI
10.4028/www.scientific.net/MSF.509.129
Citation
U. Arce-Colunga, F.A. Reyes-Valdes, A. Martínez-Villafañe, V. M. Orozco-Carmona, F. Almeraya-Calderón, R.A. Saucedo-Acuña, S.D. De la Torre, "High Temperature Oxidation of Cr-ZrO2-Al2O3 Composite Fabricated by Mechanical Alloying and Spark Plasma Sintering", Materials Science Forum, Vol. 509, pp. 129-134, 2006
Online since
March 2006
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$32.00
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