Abrasion resistance analysis of coatings at electro-arc spraying using a pulsating spraying airflow

Arc Spraying 3Cr13 Molten Drop Impact Stress Numerical Analysis

In the thermal spraying process, the process for the molten metal particles to hit against matrix to form coating experiences great change temperature. Since the coating materials has different thermal physical properties with the matrix materials, the residual stress is surely left in the coating. Much bigger residual stress not only restricts coating thickness but also primarily affects coati...

Plasma spraying and characterization of chromium carbide – nickel chromium coatings

Chromium carbide – nickel chromium powder Cr3C2-25wt.NiCr was plasma sprayed by a water-stabilized system WSP®. A series of experiments with variable feeding distance was carried out. Basic characterization of coatings was done by XRD, SEM and light microscopy plus image analysis. Microhardness was measured on polished cross sections. The main focus of investigation was on resistances against w...

Solution and Suspension Plasma Spraying of Nanostructure Coatings

Plasma spraying of micro-composite thermal barrier coatings

The thermal barrier coatings (TBCs) by gas tunnel-type plasma spraying exhibited ceramic-composite features consisting of a host oxide matrix ceramic with an embedded second phase material. The densities of the composite TBC were found to be higher than those sprayed with 100wt% ZrO2 or Al2O3. In the coatings produced with powder mixtures of 50wt%, the embedded splats are found to have a relati...

Precision spraying: using fine tuning and electronics

In the spray application process the key factor is to know the location and volume of the target. With this knowledge it is possible to make precise adjustments to the quantity of product being applied in relation to the size of the target vegetation. The new technologies of precision spraying allow growers to apply pesticides only to the target canopy or fruit, to apply the correct quantity ac...