Effect of work function and cohesive energy of the constituent phases of Ti-50 at.% Al cathode during arc deposition of Ti-Al-N coatings

SURFACE & COATINGS TECHNOLOGY

卷:357

Article

Syed, Bilal¹  Joesaar, Mats J.^1,5  Polcik, Peter²  Kolozsvari, Szilard²  Hakansson, Greger³  Johnson, Lars⁴  Ahlgren, Mats⁴  Oden, Magnus¹ 

[1] Linkoping Univ, Dept Phys Chem & Biol IPM, Nanostruct Mat, SE-58183 Linkoping, Sweden

[2] PLANSEE Composite Mat GmbH, DE-86983 Lechbruck, Germany

[3] Ionbond Sweden AB, Box 1161, SE-58111 Linkoping, Sweden

[4] Sandvik Coromant, S-12680 Stockholm, Sweden

[5] SECO Tools AB, SE-73782 Fagersta, Sweden

关键词: Cathodic arc;    TiAIN;    Work function;    Reactive hot isostatic pressing;    Coatings;   

DOI  :  10.1016/j.surfcoat.2018.10.027

来源: Elsevier

【 摘 要 】

The differences in work function (W.F.) and cohesive energy (CE.) of the phases constituting the cathode, plays an important role in the formation of the converted layer at its near-surface region during cathodic arc deposition. As a consequence, this also affects the deposition conditions for the coatings. In this study, we explore the effect of W.F. and C.E. of the constituent phases during arc evaporation by utilizing two kinds of customized Ti-50 at.% Al cathodes with different phase compositions. Our results show that during reactive arc evaporation the disparity in W.F. and C.E. among the constituent phases of Ti-50 at.% AI cathodes leads to preferential erosion of the phases with lower W.F. and C.E. The aforementioned preferential erosion begets higher surface roughness on the Ti-50 at.% Al cathode with a wider range of W.F. and C.E. disparity. It is also observed that the thermal conductivity of the Ti-50 at.% Al cathode plays a dominant role in the deposition rate of Ti-Al-N coating. This article also presents how the surface geometry of the cathode in the presence of arc guiding magnetic field significantly influences the microstructure of the deposited coatings.

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