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4902 |
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Fracture toughness of hard coatings applied by flame spray process using flexicord feedstock |
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Carlos Roberto Camello Lima* / Mackenzie Presbyterian University, Brazil Mario S. Orozco / Oriente University, College of Mechanical Engineering, Hipólito D. C. Fals/ Oriente University, College of Mechanical Engineering, Cuba Miguel A. R. Mojena/ Oriente University, College of Mechanical Engineering, Cuba Valtair A. Ferraresi/ Federal University of Uberlândia, College of Mechanical Engineering, Brazil |
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The hardness of a coating determines the depth of penetration of hard particles that are free to roll and slide against its surface. Therefore, an increase in hardness reduces abrasive wear. Additionally, the fracture toughness impacts on critical load needed to achieve the crack propagation along the coating. Then, it is crucial to present high hardness and high fracture toughness for the coating to increase wear resistance. Vickers indentation technique was employed to assess fracture toughness in hard coatings applied by flame spray using cored-wire feedstock. A comparative analysis of the values of fracture toughness obtained by experimental and theoretical methods was performed allowing to validate the experimental results and to understand the relationship of this property to the hardness of the coatings for each of the tested materials. |