Effect of FeNiCrBSiC–MeB2 Material Composition on the Oxidation Behavior at High Temperatures

Powder Metallurgy and Metal Ceramics - The effect of TiB2 and CrB2 additives on the oxidation behavior of composites made of the NiCrBSiC and FeNiCrBSiC self-fluxing alloys has been studied in air...     

Electric-spark alloying of VT22 alloy by chromium and tungsten electrode materials

We investigate the dependence of the erosion characteristics of Cr and W electrode materials during deposition of an electric-spark coating on VT22 titanium alloy. The interrelation between the phase composition, structure, and tribological properties of a coating obtained by electric-spark alloying is determined. It is shown that a coating obtained from tungsten has optimal tribological properties: a micro- hardness of 16 GPa and a wear resistance of 4.9 μm/km at a sliding velocity of 5 m/sec and a load of 0.5 MPa.     

Structure and properties of electric-spark alloyed TiN,TiB<Subscript>2</Subscript>, and Mo coatings on VT22 titanium alloy and their transformation under light-thermal treatment

We have established that electric-spark alloyed TiN, TiB₂, and Mo coatings improve substantially the tribotechnical characteristics of VT22 titanium alloy. It has been shown that an increase in the slip velocity from 1.0 to 10 m/sec increases the wear intensity and friction coefficient by a factor of 1.5–2 and 1.3, respectively. A significant amount of oxides in the coatings and their additional alloying with titanium after treatment by concentrated solar radiation favor a 3–4 times increase in the layer thickness but lower its tribotechnical properties.