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Influence Of Ultra-dispersed Composite Additives Of Intermetallic Alumina On The Structure And Properties Of Powder Tin Bronze

  • : Larisa Dyachkova1, Alexander Ilyushchenko1, Leonora Voronetskaya1, Andrew Letsko1, Tatiana Talako1
  • : 1SSI «Powder Metallurgy Institute»
  • : PDF Download
  • : 2016

Abstract

Ultrafine intermetallic additives (FeAl, NiAl, AlxTiyCrz) / Al2O3 are prepared by MASHS process. Introduction of ultrafine additives in an amount of 0.2-0.5%, regardless of its composition, leads to the structure modification, increasing the strength, reducing the friction coefficient and increasing the setting pressure limit of powder tin bronze. Increase of the additives content and additives particle size to 10-20 µm results in decrease in strength because of formation of inhomogeneous structure and the grain boundaries weakening at the basis of the material were additives are mainly located. The minimum friction coefficient and the maximum setting pressure limit is achieved when adding 0.5% of composite powder FeAl/Al2O3. Maximum wear resistance is provided by adding intermetallic AlxTiyCrz. The increased wear resistance is connected with alloying copper matrix with nickel, chromium and titanium and the change in the wear mechanism. In addition, lacunas being supplementary lubricant reservoirs are formed at the worn surface.

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