Structure, composition, and physicomechanical characteristics of tantalum diboride films

Effect of Structure on Physicomechanical Properties of Transition Metals Diboride Films

“…A similar pattern for other diborides was observed by many authors: for the TiB 2 films in [3,10], CrB 2 [5,6] and others. The general features of substructural characteristic of the described films and their properties (Table I) were observed.…”

“…• C [6,8,10,12] have the highest nanohardness values: Hv = 44 GPa (CrB 2 ), 44 GPa (HfB 2 ), 48.5 GPa (TiB 2 ), 44 GPa (TaB 2 ). The investigations of composition show an increase in the boron concentration for TiB 2 [3,4,11], TaB 2 and HfB 2 within the atomic concentration of boron B/Me = 2.2−2.6, which is probably associated with the features of electronic structure of transition metal diborides films that leads to an increase of nanohardness in comparing with the stoichiometric films (Table II, Figs.…”

Superhardness effect in transition-metal diborides films

“…ies of the structure and physicomechanical properties are discussed in detail in [12,15]. In the present work, the element composition of highly textured superhard transition metal diboride films was studied by secondary ion mass spectrometry (SIMS) and Auger electron spectroscopy (AES).…”

“…In the course of the formation of transition metal diboride films (TiB 2 , CrB 2 , TаB 2 , VB 2 , HfB 2 , etc. ), they were found to demonstrate a wide range of structural states, namely, from amorphous cluster to nanocrys talline with the growth texture in plane (00.1) plane and columnar structure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. A distinctive feature of the structure of transition metal diboride films with high physicomechanical characteristics is the columnar structure and growth texture in plane (00.1).…”

“…In this case, the main factors that affect the formation of the structure, composition, and properties of film coatings are the deposition temperature and energy of film forming particles [17]. Highly textured overstoichio metric transition metal diboride films CrB 2 , HfB 2 , TaB 2 , and TiB 2 exhibit superhardness H V equal to 43.9 [7][8][9], 44 [6,14,15], 43.9 [12,13], and 48.5 [5] GPa compared to those equal to 33, 36, 35, and 37 GPa for stoichiometric compositions, respectively.…”