09272 Development of High-Temperature Corrosion and Creep Resistant Nb, Mo and Cr Based Compositions with Protective Self-Healing Coating of Fe-45%Cr-4%Al-1%Ni-0.3%La Alloy

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Product Number: 51300-09272-SG

ISBN: 09272 2009 CP

Author: B. Bulia, A. Bakhtiyarov, O. Tsurtsumia, S. Bakhtiyarov, M. Okrosashvili, B. Eristavi and E. Kutelia

Publication Date: 2009

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In this work the results of experimental studies of new composite materials based on refractory metals with protective coatings of alumina forming Fe-45%Cr-4%Al-1%Ni-0.3%La alloy are given. The compositions with optimal correlation of heat and oxidation resistance were obtained on the Nb and Mo monocrystals and polycrystalline low alloyed Cr bulk samples coated with Fe-45%Cr-4%Al-1%Ni- 0.3%La alloy using the electron-beam vacuum evaporation technique followed by thermal-chemical treatment at 1200OC. The obtained compositions were investigated using the SEM, WDS, AES and LM. The results of the tests demonstrated that the metallic-oxide hybrid coating layer formed on the surfaces of synthesized composition materials, at high working temperatures has an ability to heal the cracks developed as a result of mechanical and thermal damage. Moreover, the developed coating material is characterized by high adhesion with the metallic substrates, and therefore it has protective features against high temperatures, corrosion and a wear. The obtained compositions can be considered as an effective engineering material for specific applications where the parts and devices manufactured from this material will have a thermal activated self-healing surface and will be able to work for a long time in ordinary and other aggressive environments with variable thermal and mechanical loading conditions at temperatures as high as 1000-1200OC.

Keywords: High temperature corrosion, Self-healing, TBC, Fe-Cr-Al-RE alloy, refractory metals, composite materials, microcrack, oxidation