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Evaluation of three dual-wire electric arc- sprayed coatings: Industrial note

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Abstract

Plasma-sprayed coatings of Ni-18.5Cr-6Al, molybdenum, and A1-12Si are used in selected applica-tions for dimensional restoration of jet engine hardware. These coatings are usually limited, how-ever, by the thickness to which they can be applied. In order to increase the coating thickness capability of these materials, the dual-wire electric arc process was investigated. This paper presents the results of a testing program to characterize the bond strengths, microstructure, hardness, and surface roughness of these three types of materials using a standard dual-wire electric arc spray sys-tem and a high-velocity (arc jet) spray gun. A comparison of bond strengths and microstructure to typical equivalent (in composition) plasma spray coatings was also made. The test program was de-signed to emulate, as closely as possible, substrate materials, spray application procedures, and coat-ing thicknesses that would be used in service.

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References

  1. H.S. Rondeau, The Behavior of Nickel Aluminum in the Electric Arc Process,8th Int. Thermal Spray Conf., American Welding Society, 1976, p 282-288

  2. R.H. Linger, Comparison of Thermal Spray Bond Coats,Thermal Spray: Advances in Coating Technology, D.L. Houck, Ed., ASM International, 1988, p 365–370

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  4. R.H. Unger and W.D. Grossklaus, Jr., “A Comparison of the Technical Properties of Arc Sprayed Versus Plasma Sprayed Nickel-5 Aluminum,” presented at 28th Annual Aerospace/Airline Plating and Metal Finishing Forum and Exposition, April 1992

  5. “TAFA Arc System,” TAFA Incorporated, 1988

  6. “TAFA Arc Spray Bondarc Wire-75B,” Technical Data Sheet No. 1.9.1.2-75B, TAFA Incorporated

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Authors and Affiliations

  1. Pratt & Whitney, 400 Main St., MS-165-34, 06108, E. Hartford, CT, USA

    P. Zajchowski

  2. PTS, Inc., 332 Beacon Hill Rd., 03275, Pembroke, NH, USA

    H. B. Crapo

Authors
  1. P. Zajchowski
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  2. H. B. Crapo
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Zajchowski, P., Crapo, H.B. Evaluation of three dual-wire electric arc- sprayed coatings: Industrial note. JTST 5, 457–462 (1996). https://doi.org/10.1007/BF02645276

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  • DOI: https://doi.org/10.1007/BF02645276

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