So in the run to make the hardest composite with good strength and good corrosion properties in extreme conditions ceramics are widely used in industries and are categorized by high melting temperatures, good wear resistance, physical and chemical stability. They are used in machining, cutting tools, and other applications due to the combination of their high hardness and strength, but the principal limitation of their use is their brittleness. Alumina, which occurs abundantly in nature, is a commonly used ceramic material, displays low thermal conductivity and toughness in its monolithic form. However, the properties of monolithic materials have not been recognized to be amenable for the development of new applications. Therefore, sintered ceramic composites for a variety of applications need to be investigated due to their desirable combination of thermomechanical and refractory properties with chemical stability. So to produce a composite with hardness close to a diamond within a way that is economical Alumina-nickel composites were prepared by carrying out spark plasma sintering (SPS) of nano-sized and microsized Al2O3 particles with 15–45 wt% Ni powders. The powder materials were sintered at a temperature of 1400 °C under constant uniaxial pressure of 50 MPa. FESEM micrographs of the products showed uniformly dispersed nickel inclusions in both matrices at intergranular positions. The presence of Al2O3 as the major phase along with Ni as the minor phase was confirmed using XRD analysis. Thermal and mechanical properties of the nano- and micro-sized Al2O3/Ni composites were investigated. Furthermore, the nano-sized Al2O3/Ni composites showed thermal and mechanical properties superior to those of the micro-sized Al2O3/Ni composites. For electrochemical properties, we are using the weight loss method to see our composite behavior in different nature mediums like acidic, basic and neutral at different temperatures.
