Advances in materials Research

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Preparation of gas-atomized Fe-based alloy powders and HVOF sprayed coatings

  • Chau, Joseph Lik Hang (Materials and Chemical Research Laboratories, Industrial Technology Research Institute) ;
  • Pan, Alfred I-Tsung (Strategy and R&D Plan Office, Industrial Technology Research Institute) ;
  • Yang, Chih-Chao (Materials and Chemical Research Laboratories, Industrial Technology Research Institute)
  • Received : 2017.10.27
  • Accepted : 2018.04.02
  • Published : 2017.12.25
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Abstract

High-pressure gas atomization was employed to prepare the Fe-based $Fe_{50}Cr_{24}Mo_{21}Si_2B_3$ alloy powder. The effect of flow rate of atomizing gas on the median powder diameter was studied. The results show that the powder size decreased with increasing the flow rate of atomizing gas. Fe-based alloy coatings with amorphous phase fraction was then prepared by high velocity oxygen fuel spraying (HVOF) of gas atomized $Fe_{50}Cr_{24}Mo_{21}Si_2B_3$ powder. Microstructural studies show that the coatings present dense layered structure and low porosity of 0.17% in about $200{\mu}m$ thickness. The Fe-based alloy coating exhibits an average hardness of about 1230 HV. Our results show that the HVOF process results in dense and well-bonded coatings, making it attractive for protective coatings applications.

Keywords

Acknowledgement

Supported by : Ministry of Economic Affairs of Taiwan

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