Study of the effect of grinding time for a compound (Al-Ni-Mgo) on the values of hardness, compressive strength and wear rate using powder technology

The effect of magnesium oxide content on the physical and mechanical properties of the composites with crushed sulfur was studied.2hr), where magnesium oxide powder was added in volume proportions (20,15,10,5,0)%, then the powder was ground by a home-made grinding device using balls of diameter (10 mm). Then the powder was compressed by (5 TON) pressure for one minute, then the sintering process of the models was carried out at a degree (6000C) for an hour and a half and that the increase in the MgO content before sintering led to an increase in the hardness from (82.13-117.73)Hv, while after sintering the hardness values were increasing from ( 87.63 - 122.19)Hv, the reinforcement ratio at 15%MgO showed the best hardness values. And the compressive strength before sintering increased from (28.11-42.29)MPa while after sintering it increased from MPa (33.71-44.58) and also the best values of compressive strength were obtained at 15% MgO The powder reinforcement leads to an increase in compressive strength to some extent, which is 15% MgO The wear test showed that increasing the MgO content before and after sintering leads to a decrease in the wear rate, as it is noted that the wear rate decreases before sintering with the increase in the magnesium oxide content, as it decreased from(1.55×10−6−1.65×10−5), while after sintering at 600 oC degree a decrease was observed. The wear rate ranged from2.19×10−7−4.25×10−6, where the best reinforcement ratio was for the magnesium oxide content at 15% MgO.