In the present study, the tribological behaviour of Alumina and AISI 52100 steel were investigated. Wear tests were carried out under atmospheric conditions and using ball-on disc tribometer. Molybdenum boride coated AISI D2 Steel was used as count erface surface. Molybdenum boride was realized on AISI D2 steel by ther mo-reactive deposition technique. The phases formed on the coated steel were MoB, Mo_2B, FeMo and FeB. Wear tests conditions were 2 and 5N loads and sliding speeds of 0.1, 0.3 and 0.5 m/s. The results showed that the coefficient of friction decreases with the increase in sliding speed while there is a drop in wear rate with the increasing sliding speed. The results also showed that the coefficient of friction of AISI 52100 steel and alumina were ranging between 0.296 - 0.622 and 0.474 -0.908 respectively. Wear rates of AISI 52100 steel and alumina were ranging between 2.27 × 10~(-8) - 3.39 × 10~(-9) and 2.344 × 10~(-9) - 3.94 × 10~(-11) mm~3/m respectively.
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