Evaluation of Changes in Microstructural Coatings Deposited by Thermal Spray

Abstract:

In this work, microstructural changes in coatings deposited by hypersonic thermal spraying technique (HVOF) were subjected to adhesive wear tests. Materials subjected to wear lose efficiency, increase costs and direct or indirect way can stop large production systems. The mechanisms involved in this type of wear can be minimized by the microstructural changes that in many cases reduces or stops the loss of material. To perform this assessment coatings compounds of Cr₃C₂25 (80 Ni-20 Cr) e Al₂O₃.TiO₂ (87-13) investigated had similar hardness values (1000 HV) and chemical characteristics. Were subjected to the ASTM G99 using commercial hard metal pin 2 mm, load 50N force and tangential velocity of 0.5 m/s. Worn surfaces and debris were analyzed by optical microscopy, scanning electron microscope and mass loss. The results show high resistance sprayed coatings worn surfaces and debris were fragile nature with little loss of material during the tests.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 476-479
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.476
• Online since: August 2012
• Authors: A.B.C. Arnt, Márcio Roberto da Rocha, Elidio Angioletto, J. Meller
• Keywords: Adhesive Wear, Coating, Thermal Spraying

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