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

U. Arce-Colunga; F.A. Reyes-Valdes; A. Martínez-Villafañe; Victor M. Orozco-Carmona; F. Almeraya-Calderón; R.A. Saucedo-Acuña; S.D. De la Torre

doi:10.4028/www.scientific.net/MSF.509.129

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HomeMaterials Science ForumMaterials Science Forum Vol. 509High Temperature Oxidation of Cr-ZrO2-Al2O3...

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.

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Periodical:

Materials Science Forum (Volume 509)

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129-134

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.509.129

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Online since:

March 2006

Authors:

U. Arce-Colunga, F.A. Reyes-Valdes, A. Martínez-Villafañe, Victor M. Orozco-Carmona, F. Almeraya-Calderón, R.A. Saucedo-Acuña, S.D. De la Torre

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Cr-ZrO₂-Al₂O₃ Composite, High Temperature Oxidation, Mechanical Alloying (MA), Spark Plasma Sintering (SPS)

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