Peculiarities of structure state and mechanical characteristics in ion-plasma condensates of quasibinary system borides W2B5-TiB2

In order to create high-durable, wear-resistant materials for a wide range of functional applications, comparative investigations of the structure and mechanical characteristics of ion-plasma Ti-W-B nano-crystalline condensates were carried out. The range of condensation rates 0.11?0.25nm/s was found to be critical for the coatings obtained from the target with 80 vol% W2B5-20 vol% TiB2. Below this, a phase with a cubic lattice (W,Ti)B0.7?1.2(O,N,C)0.3?0.2 formed, while over this range, a solid solution (W,Ti)B2 with a hexagonal lattice and element composition close to the sputtered target was observed. The structure state of the material changed from cluster-crystalline (under low sputter potentials U=0.6?1.0 kV) to textured- crystalline (under U>2.2 kV). Structure perfection improvement with U increase results in higher hardness and elastic modulus of condensates. The conditions of cluster component formation and its effect on hardness and elastic modulus of condensates are discussed. . Uporedna istrazivanja strukture i mehanickih karakteristika jon-plazme Ti-W-B nanokristalnih kondenzata su izvrsena u cilju stvaranja veoma trajnog materijala otpornog na habanje za sirok opseg funkcionalnih primena. Pronadjeno je da je opseg brzina kondenzacije od 0.11?0.25nm/s je kritican za prevlake dobijene od cilja sa 80 vol% W2B5- 20 vol% TiB2. Ispod ove vrednosti, formirala se faza sa kubnom resetkom (W,Ti)B0.7?1.2(O,N,C)0.3?0.2, dok se iznad ovog opsega formirao cvrsti rastvor (W,Ti)B2 sa heksagonalnom resetkom i sastavom elemenata bliskom cilju spaterovanja. Strukturno stanje materijala se menjalo od klaster-kristalnog (pod niskim potencijalima spaterovanja od U=0.6?1.0 kV) do teksturno-kristalnog (pod U>2.2 kV). Poboljsanje kvaliteta starukture sa povecanjem U dovodi do vece tvrdoce i elasticnog modulusa kondenzata. Razmatrani su uslovi formiranja klastera komponenti i njihov uticaj na tvrdocu i elasticni modulus kondenzata. .