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| Abstract No.: |
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Scheduled at:
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Tuesday, May 10, 2016, Room 3E 2:20 PM
New Processes I
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| Title: |
A hybrid thermal spray and sinter fusion process to apply wear and corrosion resistant coatings
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| Authors: |
Matthew Yao* / Kennametal Stellite Inc., Canada
Hakim Belhadjhamida/ Kennametal Inc., Canada
David Lee/ Kennametal Inc., USA
Jack Zheng/ Kennametal Inc., USA
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| Abstract: |
Co-based Stellite alloys such as Stellite 720 with nominal composition of Co-33Cr-18Mo-2.45C are known for their excellent wear and corrosion resistance. Stellite 720 is difficult to apply by HVOF thermal spraying and only can be applied as thin coatings for useful applications such as balls and seats used in valve industry. A hybrid HVOF thermal spray and sinter fusion process is developed to realize a thick coating with thickness greater than 0.025 (0.6 mm). In order to improve the spraying process and fusibility, the Stellite alloy composition is modified. Unlike the HVOF coating, the coatings formed by thermal spraying and sinter fusion are metallurgical bonded to the substrate and form a substantially continuous alloy coating on the surface of the component body. The microstructure of the hybrid processed coatings are examined and compared to HVOF coating microstructure of the same alloy. The wear and corrosion resistance of the hybrid processed coatings are evaluated. The coatings showed high hardness exceeding 60 HRC with excellent wear and corrosion resistance. Balls and seats are coated for valve applications.
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