Abstract The paper presents the computational studies on microstructure of WC-Co-Cr coatings deposited by High Velocity Oxy Fuel spraying (HVOF). study covers porosity assessment according to ASTM E2109-01 standard, carried out in ImageJ software, terms volume porosity, size and shape pores. evaluation was preceded scanning electron microscope (SEM) observations at magnifications 2000x 5000x. A...

Abstract 30MnB5 boron alloyed steel surface is coated using different coating techniques, namely 60(Ni-15Cr-4.4Si-3.5Fe-3.2B 0.7C)-40(WC 12Co) metallic powder plasma spray, Fe-28Cr-5C-1Mn alloy wire arc WC-10Co-4Cr (thick) high velocity oxy-fuel (HVOF), and (fine) diamond jet HVOF. The microstructure of the crude sample consists ferrite pearlite matrices iron carbide structures. intermediate bi...

The main objective of this work was to characterize and compare the microstructural mechanical properties as well erosion resistance WC-12Co WC-10Co-4Cr coatings. High Velocity Oxy Fuel (HVOF) process applied carbon manganese steel API 2H typically used in oil gas industries. Microstructural characterization feedstock powder coatings conducted using scanning electron microscope (SEM), energy di...

A novel tetradecanuclear mixed-valent cobalt cluster, formulated as [Co(II)(10)Co(III)(4)(OH)(2)O(6)(hmp)(10)(pdm)(4)(CH(3)OH)(2)]·5H(2)O (1), was obtained using mixed ligands of 2-(hydroxymethyl)pyridine (hmpH) and 2,6-pyridinedimethanol (pdmH(2)). The cobalt ions in 1 are connected by ten chelating hmp(-) ligands, four tris-chelating pdm(2-) ligands and six μ(3)-oxide/hydroxide anions, formin...