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Thermal stability of microstructure and hardness of cold-sprayed cBN/NiCrAl nanocomposite coating

Journal of Thermal Spray Technology, ISSN: 1059-9630, Vol: 21, Issue: 3-4, Page: 578-585
2012
  • 41
    Citations
  • 0
    Usage
  • 24
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    41
    • Citation Indexes
      40
    • Patent Family Citations
      1
      • Patent Families
        1
  • Captures
    24

Conference Paper Description

cBN/NiCrAl nanocomposite coatings were deposited by cold spraying using mechanically alloyed composite powders. To examine their thermal stability, the nanocomposite coatings were annealed at different temperatures up to 1000°C. The microstructure of composite coatings was characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that the nanostructure can be retained when the annealing temperature is not higher than 825°C, which is 0.7 times of the melting point of the NiCrAl matrix. The dislocation density was significantly reduced when the annealing temperature was higher than 750°C. The reaction between cBN particles and the NiCrAl matrix became noticeable when the annealing temperature was higher than 825°C. The effects of grain refinement and work-hardening strengthening mechanisms were quantitatively estimated as a function of annealing temperature. The influence of annealing temperature on the contribution of different strengthening mechanisms to coating hardness was discussed. © ASM International.

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