MECHANISM OF FORMATION OF BORIDE LAYERS ON POWDER METALLURGY MATERRIALS FROM THE SYSTEM FE-C-CU

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  • TITLE: MECHANISM OF FORMATION OF BORIDE LAYERS ON POWDER METALLURGY MATERRIALS FROM THE SYSTEM FE-C-CU
  • AUTHOR(S): I. Mitev, I. Vinev
  • ABSTRACT: In this study the mechanism of formation of boride diffusion layers of semi-permeable saturating environments in semi-permeable construction materials from the system Fe-C-Cu is traced. The main iron matrix of iron powders type NC 100.24, to which is added 2,0% Cu and 0,4% C. After sintering at 1150ºС density of the samples vary between 5,80÷7,00g/cm3. In diffusive enrichment was conducted at 950ºС for 10÷100min. Formation mechanism of the diffusion coatings is studied using X-ray diffraction analysis of resulting diffusion coatings. X- rays from were filmed X-ray diffractometer in unfiltered Kα radiation from iron anode at a critical voltage 7,1kV and Kαav = 1,93728Ǻ. It has been shown that the seeds of low boride phase Fe2B and their growth were fixed after the first 20÷40min saturation at a temperature of 950ºС, regardless of the density of the test samples. The nucleation of high boride phase is formed after the first 20min of saturation at 950ºC on samples having a density of 7,00g/cm3 and 60min at samples having a density of 5,80g/cm3.
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