Experimental investigation was conducted to explore the formation conditions and provide new insights into mechanisms of unexplained intermixing phenomenon observed at substrate-coatings interface cold sprayed materials. The results indicate that significantly depends on extent plastic deformation coating-substrate interface, with severe creating favorable for interface. Two factors have been i...

Rare-earth is an efficient refiner for surface modification of steel material. This study presents the synergistic influence Y2O3 nanoparticles (YNPs) and Mn-oxide secondary phase on microstructure mechanical properties 14CrSiMnV coating fabricated by plasma transfer arc cladding process. The results indicated that residual Y accumulated with Mn, forming a oxide particle instead inclusions or s...

Niobium coatings deposited by magnetron sputtering were evaluated as a possible surface modification for stainless steel (SS) substrates in biomedical implants. The Nb coatings were deposited on 15 mm diameter stainless steel substrates having an average surface roughness of 2 μm. To evaluate the biocompatibility of the coatings three different in vitro tests, using human alveolar bone derived ...

The cutting properties of tools can be greatly improved by AlCrSiN coatings. The AlCrSiN coatings with nitrogen content in the range of 28.2–56.3 at. % were prepared by varying the N2/Ar flow ratio from 1/4 to 1/1. The influence of N2/Ar flow ratio on composition, microstructure, and mechanical properties, as well as the tribological properties, of the coatings was investigated. With increasing...

In the oil, gas and geothermal drilling industry, use of a drill pipe is vital for its as an addition to length depth. Another function channel high pressure mud (drilling fluid / fluid) bit. During operation, several problems were encountered, such broken, bent, leaking or wash-out pipes. This very detrimental company because time replace new will take long time, disrupt program which result i...

nanostructured alumina thin films were coated on stainless steel by sol-gel dip coating method. in order to prevent crack formation, al2o3 films were kept in a solvent bath immediately after coating to reduce the rate of drying. effects of calcination temperature and withdrawal speed on structural properties were analyzed using xrd and sem. topography and thickness of coatings were analyzed by ...

In the cold-spray process, metal powder particles develop into a coating as a result of ballistic impingment on a substrate. In cold-spray, compressed gas (air, nitrogen or helium), at pressures ranging between 1.4– 3.4 MPa (200–500 psi), but typically around 1.7 MPa (250 psi), flows through a manifold system containing a gas heater and a powder feeder. The pressurized gas is heated electricall...

an evolutionary structural optimization (eso) method is used for plastic design of frames. based on safe theorems some criteria are derived and made an effort to satisfy them during the optimization process. in this regard, equilibrium is checked and yield condition is gradually satisfied during the optimization process. in this method, the amount of used material and the stiffness for each ele...