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


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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.

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10 µm

10 µm

CrSiN/CrN multilayers annealed at 1000 oC in vacuum

327

330

Double layer structure


327

Similar behavior for 330

Annealing in air Annealing in vacuum


2 µm

2 µm

327

Sintered structure of

underlayer (XRD?)

330


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


  • 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


a diffusion

b

c

10 µm

d

Chemical pitting of 1807

during Al-dip tests

5 min

20 min

45 min

4 h


a diffusion

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


B diffusion

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


5 min 20 min 45 min 4 h diffusion

1806

1807

1808

1665


  • Molecular dynamics simulations diffusion

  • 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


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