Abstract
The chapter presents the study of the formation mechanism of saturating boron atoms in ionic liquid, gaseous and powder mediums and their mass transfer to the processed surface in self-organizing mode. The authors have come to the conclusion that the dissipative compounds of self-organization are represented by boron subions, i.e. boron irons of lowest valency. The reduction of subions goes according to the electrochemical laws. In the mediums which include boron in atomic state, saturating atoms are formed due to the mechanical interaction between medium and substrate both in solid and liquid states of interacting components. The conditions for mass transfer are also analyzed. Diffusion boronized layers are generated according to the diffusion or diffusion-crystallization mechanisms. In the first case the saturating object is solid, in the second—in liquid-crystal state. The forming stages of boronized layers generated in these mechanisms are analyzed. Acicular structures of boronized layers are characteristic for the first mechanism; pseudo-eutectic and eutectic layers of heterogeneous structure based on solid solutions and boride inclusions—for the second mechanism. The saturation parameters which determine the control over the processing and properties of obtained boronized layers and are singled out.
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Notes
- 1.
The term “diffusion-crystallization mechanism” is proposed in [5] instead of using the term “liquid-solid mechanism” [39] which reflects only an aggregate state of the zone where saturation takes place. The new term reflects both the aggregate state of this zone and the way the process of forming a new layers goes.
- 2.
Vladimirov L.P. Termodinamicheskiye raschety ravnovesiya metallurgicheskih reaktcii. Moscow, Metallurgy. 1970. 330 p. [Thermodynamic equilibrium calculations for metallurgy reactions].
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Krukovich, M.G., Prusakov, B.A., Sizov, I.G. (2016). The Formation Conditions for Boride and Boronized Layers and Their Influence on the Layers’ Plasticity. In: Plasticity of Boronized Layers. Springer Series in Materials Science, vol 237. Springer, Cham. https://doi.org/10.1007/978-3-319-40012-9_7
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