| Autor: |
W Kölker, Alexander Fian, Christian Mitterer, Devrim Caliskanoglu, Bernhard Sartory, Thomas Weirather |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Surface and Coatings Technology. 206:3601-3606 |
| ISSN: |
0257-8972 |
| Popis: |
Recently, carbide-free alloying systems with yield strength R p0.1 of up to 4000 MPa and outstanding thermal stability are available, which offer the possibility to elevate coating deposition temperatures up to 600 °C. The present work demonstrates that the limited Ti 1− x Al x N coating adhesion on a Fe–25%Co–15%Mo grade caused by the absence of carbides in the substrates can be significantly improved from HF 4 to HF 2 in the Rockwell adhesion test by plasma-assisted nitriding during sputter etching. X-ray photoelectron spectroscopy measurements reveal that the nitrogen diffusion zone is confined to the first few nanometre of the substrate surface, while mainly Mo–N and partly Fe–N bondings are formed. X-ray diffraction exhibits the formation of cubic Mo 2 N in the nitrided layer. The coatings show a single-phase face-centered cubic Ti 1- x Al x N structure tending to a preferred (110) growth orientation with increasing nitriding time. Tribological tests performed at room temperature and 650 °C indicate superior wear performance of duplex Ti 1- x Al x N coated Fe–25%Co–15%Mo. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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