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Formation of Tribofilm in the Surface Layer of the Al–Ti–Cr–N–B Magnetron Coating on Boron Nitride during Hardened Steel Turning.

I.Podchernyaeva,
 
S.A.Klimenko,
 
V.M.Beresnev,
 
V.Panashenko,
 
I.N.Toryanik,
 
S.An.Klimenko,
 
M.Yu.Kopeikina
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2015, #03/04
http://www.materials.kiev.ua/article/1914

Abstract

The effect of cutting ShKh15 hardened steel on the element and phase composition of the coating surface layer deposited on the CBN-based tool is studied. Microstructure and oxidation kinetics of the surface layer of the AlN–Ti(Cr)B2 magnetron coating are investigated during both formation and turning. The coating formed by RF magnetron sputtering of AlN–Ti(Cr)B2 target. Formation features of the two-layer tribofilm having nano-size outer layer are examined. The tribofilm phase composition is estimated using layer-by-layer Auger-analysis. Its outer nano-size layer is a glass-like phase in the form of limited solid solutions based on Al2O3 oxides and playing a role of solid lubricant. Thereby, cutting speed increases, the coated tool wear rate decreases compared with uncoated tool.


COMPOSITE CERAMICS, CUBIC BORON NITRIDE, CUTTING TOOL, MAGNETRON COATING, TRIBOFILM, WEAR RESISTANCE

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