Mehmet KARADAĞ, M. Sc. Student

Metallurgical and Materials Engineering

Yıldız Technical University


Effect of hexagonal boron nitride on the coefficient of frictions of organic-inorganic hybrid polymer thin films for metal surface coatings

Supervisor: Assoc Prof. Dr. Buğra Çiçek

Organic/inorganic hybrid coatings are widely used for coatings on metals to prevent corrosion[1][2], increase thermal [3] or tribological properties[4], and a variety of other purposes [5], [6]. Ceramic materials, mostly in powder form, are incorporated into these coatings to enhance the desired characteristics or to display unique properties of the filler. Hexagonal boron nitride, which is one of the crystalline forms of boron nitride (BN) as like the others; cubic BN (c-BN), and wurtzite BN (w-BN)[7]–[9]. In particular, h-BN exhibits a layered structural arrangement. Within each layer, boron and nitrogen atoms present strong covalent bonds. Meanwhile, the layers are linked to each other by weak Van der Waals forces that could break owing to friction. These bond breakings enable lubrication, as in graphite[7]–[11]. Thus, h-BN exhibits high-lubricant characteristics and low-coefficient of friction properties approximately similar to graphite [11]–[14]. In this study, a new silane/h-BN composite coating was reported regarding tribological subjects. In order to produce these new coating, sol-gel method was taken into consideration.

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[14]    W. T. Hsiao, C. Y. Su, T. S. Huang, and W. H. Liao, “The microstructural characteristics and mechanical properties of Ni-Al/h-BN coatings deposited using plasma spraying,” J. Alloys Compd., vol. 509, no. 32, pp. 8239–8245, 2011, doi: 10.1016/j.jallcom.2011.05.095.




  • M. Karadağ, O. Karaahmet, B. Çiçek, and M. İ. Usta, “Effect of hexagonal boron nitride on the coefficient of frictions of organic-inorganic hybrid polymer thin films for metal surface coatings,” Journal of Adhesion Science and Technology, vol. 34, no. 20, pp. 2200–2215, 2020.