Influence of overstoichiometric boron and titanium addition on the properties of RF magnetron sputtered tungsten borides
Tomasz Mościcki , Rafal Psiuk , Hanna Słomińska , Neonila Levintant-Zayonts , Dariusz Garbiec , Marcin Pisarek , Piotr Bazarnik , Szymon Nosewicz , Justyna Chrzanowska-Giżyńska
AbstractIn this work, (W,Ti)B2 films with different stoichiometric ratio Ti/W deposited on silicon and 304 stainless steel by radio frequency magnetron sputtering are presented. The coatings were deposited from plasma spark sintered targets obtained from the mixture of pure boron, tungsten and titanium powders. It is shown that during plasma spark sintering process using overstoichiometric boron and a low content of titanium change the WB2 to WB4 phase with almost no secondary phases. Subsequently, the impact of titanium content on the films properties is investigated systematically, including the chemical and phase composition, crystalline structure, surface and cross-section morphology. Simultaneously, nano-indentation test and ball-on-disk tribometery are performed to analyse the hardness and tribological properties of the films. It is shown that deposited films with titanium content of 3.6 and 5.5 at.% are formed in the zone T of the Thornton's Structural Zone Model. In opposite to α- WB2 magnetron sputtered coatings they are more flexible and hard nanocomposite coatings. The results show that the addition of titanium is apparently changing the film structure from nanocrystalline columnar to amorphous, very dense and compact structure with the addition of TiB2 phase. That films are simultaneously hard (H > 37.5 GPa), have high hardness to effective Young's modulus ratio values (H/E⁎ > 0.1) and elastic recovery (We > 60%) appropriate for tough and resistant to cracking materials. The presented (W,Ti)B2 films exhibit also tribological and corrosion properties better than unalloyed coatings.
|Journal series||Surface and Coatings Technology, [Surface and Coatings Technology], ISSN 0257-8972|
|Publication size in sheets||0.55|
|Keywords in English||Superhard films; Ternary tungsten borides; RF magnetron sputtering; Wear resistance; Corrosion|
|ASJC Classification||; ; ; ;|
|Score||= 100.0, 09-06-2020, ArticleFromJournal|
|Publication indicators||= 0; : 2016 = 1.359; : 2018 = 3.192 (2) - 2018=3.11 (5)|
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