High temperature oxidation-sulfidation of Cr-Zr02-AI 2O3 composite fabricated by mechanical alloying and spark plasma sintering
Abstract
The high temperature oxidation-sulfidation resistance of Cr-ZrO <sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> composites fabricated by mechanical alloying (MA) and spark plasma sintering (SPS) has been evaluated. Composite powders were prepared by ball milling Cr-5vol%ZrO<sub>2</sub>-50vol%Ai <sub>2</sub>O<sub>3</sub>, for 7 hours. Powders were then compacted by SPS in less than 5 min, so that a particular metal-ceramic interpenetrating network has been obtained. The high temperature oxidation-sulfidation tests (700-900°C) conducted under 0.25%SO<sub>2</sub>+3.6%O<sub>2</sub>+N<sub>2</sub> (balance) atmosphere have revealed a good oxidation-sulfidation resistance (0.35, 1.17 and 1.8 mg/cm<sup>2</sup> at 700, 800 and 900°C respectively for 48 hours) since a protective Cr<sub>2</sub>O<sub>3</sub> layer forms upon heating. The significance of the obtained results concerns the design and development of sulfidation resistant alloys.
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