Hydrochloric Acid Corrosion Behavior of Nb₂O₅-Al₂O₃ Ceramics Prepared by Microwave Sintering

Abstract:

The influences of Nb₂O₅ on the phase, microstructure and hydrochloric acid corrosion behaviors of Nb₂O₅-Al₂O₃ ceramics sintered with 2.45 GHz microwave energy were investigated. The results showed that Nb2O5 reacted completely with Al₂O₃ to form AlNbO₄ and densified the pure Al₂O₃ at a lower sintering temperature and in a short sintering time. Nb₂O₅-Al₂O₃ ceramic samples were corroded in diverse concentration hydrochloric acid for different time. Weight loss rate of Nb₂O₅-Al₂O₃ ceramic rose dramatically when the corrosion time was not longer than 4 h, and it increased slowly beyond 24 h. After Nb₂O₅-Al₂O₃ ceramic samples were corroded for 1 h, pitting corrosion was observed by scanning electric microscope, which was consistent with the analysis results of the scanning Kelvin Probe.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 55-58
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.55
• Online since: December 2011
• Authors: Yun Long Ai, Fei He, Bing Liang Liang, Wen He, Li Liu
• Keywords: Al₂O₃, Microwave Sintering, Nb₂O₅, SKP

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