Superhard Nanostructured Ceramic–Metal Coatings with a Low Macrostress Level


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Abstract

The macrostressed state of (Ti,Al)N–Cu and (Ti,Al)N–Ni ceramic–metal coatings obtained by the arc-PVD method has been studied using X-ray diffraction and by measuring the radius of curvature of a coating–base composite sample (Stoney’s method). It is established that the presence of a tough metal phase favors significant reduction in the level of macrostresses in these structures as compared to those in (Ti,Al)N ceramic coatings, the absolute values of which decrease from 4.7–4.3 to 0.17–0.32 GPa. At the same time, both Ti–Al–Cu–N and Ti–Al–Ni–N coatings retain high hardness of 43 and 51 GPa, respectively, versus 29 GPa for Ti–Al–N coatings. The obtained results give grounds to suppose that the high hardness of the ceramic–metal coatings studied is determined by their nanocrystalline structure rather than by compressive macrostresses.

About the authors

I. V. Blinkov

National University of Science and Technology Moscow Institute of Steel and Alloys

Author for correspondence.
Email: biv@misis.ru
Russian Federation, Moscow, 119049

A. O. Volkhonskii

National University of Science and Technology Moscow Institute of Steel and Alloys

Email: biv@misis.ru
Russian Federation, Moscow, 119049

D. S. Belov

National University of Science and Technology Moscow Institute of Steel and Alloys

Email: biv@misis.ru
Russian Federation, Moscow, 119049

V. S. Sergevnin

National University of Science and Technology Moscow Institute of Steel and Alloys

Email: biv@misis.ru
Russian Federation, Moscow, 119049

A. V. Chernogor

National University of Science and Technology Moscow Institute of Steel and Alloys

Email: biv@misis.ru
Russian Federation, Moscow, 119049

T. V. Kiseleva

National University of Science and Technology Moscow Institute of Steel and Alloys

Email: biv@misis.ru
Russian Federation, Moscow, 119049

A. V. Bondarev

National University of Science and Technology Moscow Institute of Steel and Alloys

Email: biv@misis.ru
Russian Federation, Moscow, 119049

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