Air plasma sprayed thermal barrier coatings (TBCs) are widely used in gas turbines to provide insulation for the metallic engine components. During service, multi-layered and multi-material systems undergo mechanical degradation. The degradation mechanisms include sintering, phase transformation, residual stress, oxidation, erosion CMAS attack. leads initiation propagation of cracks at or near ...

Titanium is widely used for medical purposes. It related to bone repair because of its favorable mechanical properties and biocompatible ability osseointegrate in host tissue. A good lasting connection the implant with tissue possible when there are sufficient conditions grow into pores material, therefore use a porous titanium coating may be helpful solving this problem. In paper, shrouded pla...

This study compared the filtrating efficiency (FE) of a commercial electronic air filter for filtering bacteria and viruses from contaminated air with a high efficiency particulate air (HEPA) filter. An enclosed chamber was constructed, in the middle of which an air filter was placed for testing. MTB H37Ra and T7 virus at concentrations of 5x10(8) each were sprayed into one side of the chamber ...

A micromechanical model is developed to predict microstructure evolution and the resultant in-plane modulus increase in a thermal barrier coating (TBC) manufactured by air plasma spray (APS). The based on experimental observation that main sintering events include progressive healing of inter-splat cracks coarsening columnar grains within splats. During sintering, splats undergo Coble creep, wh...

Thermal barrier coatings (TBC) are used widely on a range of components that operate at high temperatures. We report measurement of the factor that is required to convert the Raman shift to stress for air plasma sprayed yttria (7 wt %) stabilized tetragonal zirconia (ZrO(2)) (YSZ) thermal barrier coatings. The factor is evaluated for the as-coated condition and also following a heat treatment a...