Deposition Of Coatings Containing Si And B
On Steels In A CVD Fluidised Bed Reactor
Author(s)
P. Agrianidis, K. G. Anthymidis, K. David & D. N. Tsipas
Abstract
Diffusion coatings are frequently used to protect materials in various aggressive
environments and in order to improve their surface properties. Fluidized bed
technology (FBT) has been successfully used for the deposition of different types
of diffusion coatings by a C.V.D. process, e.g. aluminizing, chromizing,
nitriding, carburizing. On the other hand, very little information exists on
boronizing or siliconizing using FBT, although the method is simple, efficient
and environmentally friendly and the boride coatings have been reported to have
an excellent combination of properties, e.g. high fatigue strength and wear
resistance and the silicide coatings are well known for their excellent corrosion
resistance. In this paper the results of a process of boronizing and siliconizing of
steels via C.V.D. in a fluidised bed reactor are presented. Coatings of different
thicknesses were obtained at temperatures below 1000°C. The coatings were
analysed by means of optical microscopy, as well as by x-ray diffraction (XRD)
and Vickers microhardness, in terms of the coating’s composition, morphology,
thickness, hardness and phase formation. The boride coatings showed
significantly improved tribological properties under dry wear conditions.
Keywords: C.V.D., diffusion coatings, siliconizing, boronizing, fluidised bed
technology.
Keywords
C.V.D., diffusion coatings, siliconizing, boronizing, fluidised bed
technology.
Related Book
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