Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

Surface morphology of bearing sleeves made of PM bronze and their properties

nr katalogowy: 78038

In technologies of production of self-greasing bearings the porous framework is saturated with a liquid grease or grease material particles are introduced in the base powder. PM bronze or iron is used as material for bearing bases made with the use of powder metallurgy method [1]. The PM bronze sintering kinetics was described in paper [2]. A special group of bearings are bearings operating under increased temperature. They require special hard greases suitable for such conditions and resistant to oxidation. Results obtained on steel sinters [3] indicate that solid grease mixtures composed of microparticles and nanoparticles in the quantity of 7?€15% and size of 50?€200 nm constitute an effective grease both under the ambient temperature and increased temperature. The grease is introduced, with the use of a pressure method, in the form of a solid grease suspension into the porous structure of the sinter, which leads to a formation of a thin layer of grease film on the internal surface of the sleeve [4, 5]. Paper [6] presents the results of tests on bronze sinters to be used for bearings. The influence of unit pressing pressure on the density, mechanical properties of bronze sinters and surface morphology has also been developed. This paper specifies the sinter properties in the form of sleeves for infiltration with the use of MoS2 nanoparticles assuming parameters of their production specified in the paper [6]. OBJECTIVE The objective of the test included the assessment of the surface condition and mechanical properties of sleeves made of PM bronze after such operations as sintering, calibration and calibration with densification. The tests made on the sleeve included: .. determination of the density depending on the technological process conducted, .. observation of the surface condition with the use of a scanning electron microscope (SEM), .. tests on mechanical properties of sleeve during a technological comp[...]

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2013-3

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