Improving the physical and mechanical properties of nickel by adding nano titanium oxide by powder technology

Abstract

In the current article aims to study the effect of Nano construction on the physical and mechanical properties of nickel, samples were made from samples of nickel-based metal and supported with nano titanium oxide, with volumetric ratios of (0,5,10,15,20) %, where the matrix and the reinforcement were ground using a homemade microwave mill with milling times of (3, 6, 9) hours. After that the required weights were prepared and the powders were pressed at (100 bar) and for a time of one minute only. Then the samples resulting from pressing were thermally treated by means of oven and at 1200°C for a time of two hours, physical tests were carried out that included green density and bulk, true porosity, and mechanical properties are hardness, wear rate. The physical and mechanical tests gave the best results after sintering and at a milling time of 9 hours and reinforcement from (0-20) % where the green density decreased from (7.01-5.20) g/cm3, and the bulk density after sintering decreased from (8.43-7.20) g/cm3, porosity increased from (15.43-8.8)%. The mechanical properties increased the hardness from (99-240) Kg/mm2, while the wear rate decreased from (4.03×10-7-6.59×10-8) g/cm. All these results indicate an improvement in nickel metal with an increase in the Nano composition ratio.