MECHANICAL PROPERTIES OF NICKEL-SIL

Abstract

Ni – Si alloys are used in the manufacture of heat-resistant coatings. However, due to the fact that the production of compact specimens presents considerable difficulties are insufficient data in the literature on their mechanical properties. In this work, the manufacturing techniques Ni – Si alloys for mechanical testing, which consists in melting the alloy under pressure, cooling the alloy under pressure and pressure drop. Polished sample was made of samples with different chemical composition, their structure and microhardness were studied. As a result, the study found that by increasing silicon content up to 30 – 40 % microhardness Ni – Si alloys decreases to 5.5 – 6.0 GPa, with a further increase in the silicon content microhardness increases signifi cantly, due to the presence of the phase structure NiSi2 and Si, that have high microhardness values.