Effects of texturing patterns on the adhesion strength of atmosphere plasma sprayed coatings
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Zhi-guo Xing and Xiao-li Wang National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China
Hai-dou Wanga) Institute of Surface/Interface Science and Technology, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, Harbin Engineering University, Harbin 150001, China; and National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China
Guo Jin Institute of Surface/Interface Science and Technology, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, Harbin Engineering University, Harbin 150001, China
Bin-shi Xu Institute of Surface/Interface Science and Technology, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, Harbin Engineering University, Harbin 150001, China; and National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China (Received 12 December 2016; accepted 10 April 2017)
Surface texture was prepared on the ASTM1045 steel substrate before spraying. Three texturing patterns (groove pattern, square pattern, and hexagon pattern) were acquired by laser processing to investigate the influence of texturing patterns on the adhesion strength of sprayed coatings. The Ni60 coatings were prepared on the textured surface by atmosphere plasma spraying technology. Scanning electron microscopy and laser 3D microscope were used to characterize the morphology of texturing. The adhesion strength between coating and substrate was examined by the tensile test. Image pro plus software was used to calculate the contact area ratio of the textured substrate. The results show that the texturing processed substrates by laser radiation present plain area between two dimples and the protrusion around texturing, and the contact area between coating and substrate is increased. The adhesion strength of coatings with a groove pattern, a square pattern, and a hexagon pattern is 58, 33, and 47 MPa, respectively. The adhesion strength of sprayed coatings varies with the change of the texturing pattern, and it does not only depend on the contact area ratio but also on the texturing density and the texturing microstructure.
I. INTRODUCTION
The urgent demand for thermal spraying coating is increasing as the engineering working condition is becoming harsher. Thermal spraying coatings not only protect the integrity of the substrate and maintain the mechanical properties but also can enhance the wear and corrosion resistance of the substrate.1 Sprayed coatings have been applied in many different machine parts to provide wear, erosion, and corrosion protection,2,3 such as piston ring, cylinder liners, sealing ring, etc.4–6 However, the weak adhesion strength of the sprayed coatings due to the mechanical bond style limits their application. Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2017.164
Conventionally, cleaning (degreasing)
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