THE INFLUENCE OF CERAMIC PARTICLES ON THE CORROSION PROPERTIES OF NOVEL TI750 MATRIX ALLOY

Abstract

This paper explores the corrosion behavior of matrix Ti750 alloy and its composites prepared using SiCp, B4C, SiCw, and GPLs particles as reinforcement. The consolidation of the metallic powders was by spark plasma sintering method. The study chose mixed molten salt of 25% NaCl + 75% Na2SO4 as the corrosive medium and the hot corrosion behavior of the solidsolution aging at 800 °C. The study found that at the same corrosion temperature, the rate of change of the weight gain curves of all the materials was similar. The corrosion weight gain of the base material was the highest (14.10 mg.cm-2), whiles the 5vol.% SiCp reinforced composite had the lowest weight gain of 5.1 mg.cm-2, which is 36.17% of the base alloy. The corrosion products of all the materials were mainly composed of TiO2, Al2O3, Na2TiO3, and Al2TiO5. The peak of SiO2 was enhanced when SiCp was added, and there was no distinct peeling off of the corrosion layers, unlike the base material, which had partial shedding, deep cracks, and holes. The 5vol.% SiCp reinforced composite therefore possessed the best corrosion performance.

Keywords

• ti750 matrix alloy
• ceramic particles
• powder metallurgy
• corrosion
• spark plasma sintering (sps) .