Abstract
The microstructure, mechanical properties, and friction-wear performance of (TiBx/TiSiyCz)x3 multilayer coatings deposited on the M2 steel by the pulsed laser deposition are investigated in detail in as-deposited state and after annealing at 500 °C for 5 min in air. Scanning and transmission electron microscopies are used to reveal microstructural changes caused by annealing. The influence of post-deposition annealing on hardness and Young modulus is studied in nanoindentation test. A scratch-test is applied to reveal changes in adhesion and the coefficient of friction (CoF) of coated samples with diamond before and after annealing. Friction-wear properties are also analyzed in dry sliding with Al2O3 and 100Cr6 steel in ball-on-disc tests. Our analysis shows that the post-deposition annealing leads to partial devitrification of the TiBx layers, where nanocrystalline TiB2 phase is identified, while the TiSiyCz layers retain amorphous. Annealing significantly increases mechanical properties of coated samples and adhesion of the (TiBx/TiSiyCz)x3 multilayer to steel substrates. Friction-wear properties of coated samples are also notably improved. The values of CoF for coated samples tested with diamond (in the scratch-test), alumina, and 100Cr6 steel (ball-on-disc tests) are in the range of 0.05–0.23, while for M2 steel the CoF values are 0.8, 0.45, and 0.8, respectively.
Highlights
Nanostructured coatings have attracted much experimental interest in recent years mainly due to their unique physical and mechanical properties, such as high hardness, stiffness, and good toughness, that are not typically found in conventional microstructural coatings [1,2,3,4,5,6,7,8]
The purpose of this work is to investigate the effect of short annealing on the microstructure, mechanical and friction-wear properties of (TiBx /TiSiy Cz )x3 multilayer deposited by the pulsed laser deposition method on high speed steel (HSS) M2 steel substrate, using TiB2 and
The (TiBx /TiSiy Cz )x3 multilayer in as-deposited state is amorphous, as clearly indicated on Figure 1a—SAED pattern inserted in right corner of TEM BF image
Summary
Nanostructured coatings have attracted much experimental interest in recent years mainly due to their unique physical and mechanical properties, such as high hardness, stiffness, and good toughness, that are not typically found in conventional microstructural coatings [1,2,3,4,5,6,7,8]. Titanium with boron form three compounds, namely TiB, TiB2 , and Ti3 B4 [9], but the most extensively studied is TiB2 , because of its attractive combination of physical and mechanical properties, such as relatively low density (4.32 g/cm3 ), high melting point (3225 ◦ C), high hardness (25–30 GPa) and elastic modulus (450–550 GPa), good thermal and electrical conductivities, and thermal stability [10].
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