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Thermal Stability of Nanostructured Superhard Coatings on the Basic of TiN

Time:2012-09-24 08:36:07  From:9th International Conference on Modification of Materials wi  Author:S. V. Ovchinnikov; A. D. Korot

Thermal Stability of Nanostructured Superhard Coatings on the Basic of TiN

S. V. Ovchinnikov; A. D. Korotaev; Yu. P. Pinzhin
9th International Conference on Modification of Materials with Particle Beams and Plasma Flows Proceedings (2008)

abstract:Auger electron spectroscopy, electron microscopy, X-ray structural analysis and micro- hardness measurements are used to study the rela- tion between the structural phase state and me- chanical properties of Ti–Si–B–N–O–C and Ti–Al– Si–N–O–C coatings in the as-deposited state and after subsequent vacuum annealing. During depo- sition a TiN-based phase with nanocrystalline or two-level grain structure can be formed which is distributed in the X-ray amorphous phase whose volume fraction is 20–50%. The grain structure of the coatings can be purposefully changed by alloy- ing or deposition temperature variation. It is found that independently of the structural state and com- position the coatings are superhard and have high thermal stability of superhardness and microstruc- ture up to temperatures Т ≈ 1000 °С. The hardness reduces at Т > 1000 °С as a result of dislocation recovery and beginning of recrystallization. The obtained results suggest that the high strength properties of the coatings are due to the presence of a dislocation substructure and high shear resis- tance of X-ray amorphous phases along nanocrys- tallite boundaries.

keywords:cracks; cyclic; loading conditions; strain range; number of cycles; segmentation; TBC; thermal barrier coating

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