Journal of Thermal Spray Technology

, Volume 21, Issue 2, pp 344–354 | Cite as

HVOF Spraying of Fe-Based MMC Coatings with In Situ Formation of Hard Particles by Hot Isostatic Pressing

  • A. Röttger
  • S. L. Weber
  • W. Theisen
  • B. Rajasekaran
  • R. Vaßen
Peer-Reviewed

Abstract

Thick (2-3 mm) Fe-base coatings with admixed ferrotitanium (Fe30Ti70) were applied to austenitic steel by a high-velocity oxy-fuel process (HVOF). Hot-isostatic pressing (HIP) was carried out to the decrease porosity and to increase the material strength, wear resistance, and adhesive bond strength of the deposited coating to the substrate material. SEM and XRD investigations confirmed the formation of hard titanium carbide (TiC) particles during HIP treatment as a result of strong carbon diffusion out of the metal matrix and into the Fe30Ti70 particles. The mechanical and wear properties of the densified coatings were investigated by means of shear tests, hardness measurements, and abrasive wear tests. A comparison of the coatings in the as-sprayed and the HIPed state showed a large increase in the wear resistance due to in situ TiC formation.

Keywords

Fe-base HIP HVOF in situ TiC MMC 

Notes

Acknowledgments

Financial support of this project from the German Research Foundation (DFG Project No. TH531/6-1; VA163/4-1) is gratefully acknowledged.

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Copyright information

© ASM International 2012

Authors and Affiliations

  • A. Röttger
    • 1
  • S. L. Weber
    • 1
    • 2
  • W. Theisen
    • 1
  • B. Rajasekaran
    • 3
  • R. Vaßen
    • 3
  1. 1.Lehrstuhl WerkstofftechnikRuhr-Universität BochumBochumGermany
  2. 2.Helmholtz-Zentrum Berlin für Materialien und Energie GmbHBerlinGermany
  3. 3.Institute of Materials Synthesis and Processing (IEF-1), Institute of Energy Research, Research CentreJuelichGermany

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