Investigation Of Coating Properties In Cr2O3 +TiO2 Coatings Of Glass Fiber Reinforced Composite Materials By Flame Spray Coating Method

Abstract

In this study, the coating properties of glass fiber reinforced composite materials were examined in Cr₂O₃ +TiO₂ coating by flame spray coating method. In the manufacture of the composite materials to be coated, glass fiber woven fabrics with different fiber densities (200, 300 and 500 g/m²) and epoxy resin were used as matrix material. Composite materials were manufactured using the hand lay-up method. Coating processes of Cr₂O₃ +TiO₂ ceramic powders were performed on the composite materials manufactured in the form of plates using the flame spray coating method. In order to examine the coating quality of the coated materials, samples were prepared from the coated plates in accordance with the standards and experiments were carried out to determine microstructure examinations, hardness measurements, surface roughness measurements and adhesion strength values. Microstructural examinations of the samples were carried out under optical microscope and SEM microscope. Measurements of porosity amounts of the coatings were made with the Clemex image analysis program on the optical microscope. The microhardness values of the coatings were measured on the surface of the samples using a micro hardness measuring device. The adhesion strength of the samples was determined in the tensile test device according to ASTM C-63 standard. It has been determined that the properties of the coated composite material affect the coating quality. The highest adhesion strength values ​​among the coated samples were obtained in the coating made on glass fiber reinforced (500 g/m²) composite material, which has the highest fiber density. Hardness values and adhesion strength values of coatings with high porosity amount were low.