|About this Abstract
||Materials Science & Technology 2011
||Advanced Protective Coatings for Refractory Metals and Alloys
||Structural Formation and Oxidation Resistance of Si-Al-Y Co-Deposition Coatings on Nb-Ti-Si Based Multicomponent Ultrahigh Temperature Alloy
||Xiping Guo, Chaofeng Zhang, Ping Guan
|On-Site Speaker (Planned)
Nb-Ti-Si based multicomponent ultrahigh temperature alloys have attracted much attention recently due to their high melting points, low densities, acceptable room temperature fracture toughness and good elevated temperature creep strength. Although the alloying additions of Ti, Hf, Cr and Al elements have improved the oxidation resistance of the alloys obviously, protective coatings are still essential to their application in oxidizing and corrosive environments. Halide activated pack cementation (HAPC) is an effective way to produce diffusive coatings on the surface of the alloy. In this paper, Si-Al-Y co-deposition coatings were prepared on an Nb-Ti-Si based multicomponent alloy by HAPC process, and their structure and oxidation behaviors at 1250℃ have been revealed. The scale developed on Si-Al-Y co-deposition coatings upon oxidation at 1250℃ has multi-layer structure and is composed of Al2O3, TiO2 and SiO2. Spallation of the scale hardly occurred during oxidation till 300h at 1250℃.
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