1 / 11

Project review on Nov. 8. 2007 Some SEM + EDX results CrSiON patent structure MD simulations

Project review on Nov. 8. 2007 Some SEM + EDX results CrSiON patent structure MD simulations. 10 µm. 10 µm. CrSiN/CrN multilayers annealed at 1000 o C in vacuum. 327. 330. Double layer structure. 327. Similar behavior for 330. Annealing in air Annealing in vacuum. 2 µm. 2 µm.

Download Presentation

Project review on Nov. 8. 2007 Some SEM + EDX results CrSiON patent structure MD simulations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Project review on Nov. 8. 2007 • Some SEM + EDX results • CrSiON patent structure • MD simulations

  2. 10 µm 10 µm CrSiN/CrN multilayers annealed at 1000 oC in vacuum 327 330 Double layer structure

  3. 327 Similar behavior for 330 Annealing in air Annealing in vacuum

  4. 2 µm 2 µm 327 Sintered structure of underlayer (XRD?) 330

  5. 2 µm 2 µm EDX at% Cr 97.2 Si 2.8 Cr 97.7 Si 2.3 Cr 96.9 Si 3.1 Cr 97.6 Si 0.8 327 330

  6. Oxidation stable CrSiON protection coatings with low diffusion • and low wettability for Al die casting • D. Kurapov, A. Reiter, L. Castaldi, V. Shklover, J. Patscheider • - Technical field • Problems of prior art. Main failure modes: soldering/corrosion, • washout (erosive wear), thermal fatigue • Solution of problem: introduction of Si and O to basic CrN. • What are proper concentrations of Si and O? • - Coatings characterization • - Comparison of best coating CrSiON 1807 with CrC coating • 1665 (CAST) during Al dip tests (test conditions: AlMg5Si2Mn) • Formation of brittle FeAlSi(Cr) intermetallics in the pitting areas • Lower attack by molted Al for CrSiON than for standard CAST • H13 remained protected as soon as coating remained intact

  7. a b c 10 µm d Chemical pitting of 1807 during Al-dip tests 5 min 20 min 45 min 4 h

  8. a 5 µm b c d 10 µm Chemical pitting of 1665 during Al-dip tests 5 min 20 min 45 min 4 h Markers of HT interdiffusion

  9. B A 3 µm 3 µm Composition of soldering phases (SEM+EDX) 1807 1665 6506 6509 5 min 6519 6521 20 min 6564 6561 45 min 6597 6595 4 h

  10. 5 min 20 min 45 min 4 h 1806 1807 1808 1665

  11. Molecular dynamics simulations • VASP software: ab-initio quantum-mechanical molecular • dynamics calculation using pseudopotentials and a plane wave • basis set, finite-temperature local-density approximation • Gonzales (gonzales.ethz.ch) is high-performance Linux cluster of • 288 compute nodes, each node has 250 processors with 2.5 GHz • and 8 GB • What could be done: • How stability of cubic CrN changes with Cr and O contents • How can O concentration influence preferred orientation in • CrSiON (formulation on atomic scale level) • Hardness consideration based on elastic properties of crystals • Electronic structure as a function of composition • Gibbs energy as a function of oxygen content

More Related