SURFACE MODIFICATIONS BY ABRASIVE BLASTING ON TITANIUM AND ALLOYS BEFORE PVD COATINGS

Surface preparation plays an important role before coating on the substrate. Which increases bond strength, removal of rust, scale, burrs, edge profiling. Different surface modifications among abrasive blasting give effective results. This study evaluates Al2O3, glass granet sand, Al metal grits in terms of particles to the titanium surface. Alumina oxide (Al2O3) grits with various sizes are widely used for surface modifications. Grit-blasting is often used as a stand-alone titanium pre-bond treatment. However, sandblasting with Al2O3 grits also introduces impurities to the surface of the Ti. The present work shows the analysis of an abrasive blasting process using different abrasive particles on Ti6Al4V surfaces. In contrast to the case for aluminum, grit-blasting treatment of titanium is one of the best procedures for obtaining good initial joint strength. Six commercially pure grade 5 (CP5) titanium cylinders were gritblasted using various grits. The surface roughness average (Ra) of all grit-blasted plates was measured. The metallic samples were first characterized by optical microscopy (OM), revealing a α+β microstructure. before and after sandblasting by alumina grit blasting particles. The Al2O3 particles used had a grit particle size between 20µm,24µm, or 36µm with a median particle size (d13) of 600 μm, on the surface. The surface roughness (Ra) was calculated by hardness testing machine and the surface finish was observed before and after sand-blasting. Kinetic energy by a factor of 3.5 is the change in the size of the particles generated a loss upon particle. PVD coatings are widely used nowadays to reduce the wear of the substrate. By this process it was observed, exerting a polishing effect on the surface of the Ti-6Al4V alloy gives effective results before coatin