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Effect of adhesion and tribological properties of modified composite nanostructured multi-layer nitride coatings on WC-Co tools life http://researchonline.ljmu.ac.uk/id/eprint/9965/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. Citation (please note it is advisable to refer to the publisher's version if you intend to cite from this work) Vereschaka, A, Aksenenko, A, Sitnikov, N, Migranov, M, Shevchenko, S, Sotova, C, Batako, ADL and Andreev, N (2018) Effect of adhesion and tribological properties of modified composite nano-structured multi-layer nitride coatings on WC-Co tools life. Tribology International, 128. pp. 313-Abstract:The paper presents the results of the comparative tests of carbide samples with multilayered nano-structured coatings based on titanium nitrides (Ti-TiN-(Ti,Cr,Al,Si)N) and zirconium nitrides (Zr-ZrN-(Nb,Zr,Cr,Al)N and Zr-ZrN-(Zr,Al,Si)N). The phase composition and microstructure of these coatings were studied. The scratch test method was applied to study the adhesion bond strength to the substrate and the coating fracture patterns. The tribological parameters of the coated samples were studied at temperatures of 450°C-900 °C. The cutting properties of the tools with the coatings under study were investigated in turning AISI 321 steel. Various coating parameter effects on the cutting tool life were studied.

The complex investigation of dc transport and magnetic properties of the epitaxial manganite/iridate heterostructure was carried out by mean of X-ray (XRD), dc resistance measurements, ferromagnetic resonance (FMR) and polarized neutron reflectivity (PNR).Epitaxial growth of the heterostructure proceeded according to the -cube-to-cube‖ mechanism with the small lattice turn. The dc measurement indicates the presence of a conduction channel at the iridate/manganite interface due to the charge leakage from iridate that makes it hole doped, while the manganite side becomes electron doped. This is confirmed by the first principles calculations based on density functional theory [Sayantika Bhowal, and Sashi Satpathy AIP Conference Proceedings 2005, 020007 (2018)] that show the charge transfer at the interface from the half-filled spin-orbit entangled J eff = 1/2 state of the iridate to the empty e ↑g states of manganite. The neutron scattering data show the turn of magnetization vector of the heterostructure (mainly manganite) on 26 degree closer to the external field with reducing temperature down to 10K. Additional ferromagnetic state appearing at T<100K indicate on emergence of ferromagnetism in the thin (10 nm) paramagnetic SIO film close to the interface.We have measured the dc voltage aroused on the SIO film caused by spin pumping and the anisotropic magnetoresistance in the heterostructure.

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