Diffusion impregnation of alloys under conditions of complex formation
In most cases, diffusion impregnation of alloys with elements for the purpose of improving their service properties occurs with chemical interaction with the constituents of the base. Such processes are described within the limits of the model of reaction diffusion, assuming the formation and growth of new continuous layers by the Fick equation. At the same time, instantaneous reaction of the elements is assumed, as the result of which the rate of the whole process is limited by diffusion. Together with this, diffusion processes and chemical transformations occur simultaneously, as the result of which continuous phases are not formed (internal oxidation, nitriding, etc.). The purpose of this work was an analytical investigation of diffusion impregnation by element A from a constant source of a flat specimen initially uniformly alloyed with a mobile impurity B. The model presented makes it possible to investigate the initial stage of homogeneous formation of complexes and to reveal their influence on the kinetics of redistribution of the diffusing elements.
- Research Organization:
- G.V. Karpenko Physicochemical Inst., Academy of Sciences of the Ukranian SSR, Lvov
- OSTI ID:
- 6199643
- Journal Information:
- Sov. Mater. Sci. (Engl. Transl.); (United States), Vol. 20:6; Other Information: Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 20, No. 6, pp. 29-34, November-December, 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALLOYS
DIFFUSION COATING
IMPREGNATION
STOICHIOMETRY
BOUNDARY CONDITIONS
BOUNDARY-VALUE PROBLEMS
CHEMICAL REACTION KINETICS
COMPLEXES
DIFFERENTIAL EQUATIONS
IMPURITIES
LAPLACE TRANSFORMATION
MATHEMATICAL MODELS
METALLURGICAL EFFECTS
PROTECTIVE COATINGS
COATINGS
DEPOSITION
EQUATIONS
INTEGRAL TRANSFORMATIONS
KINETICS
REACTION KINETICS
SURFACE COATING
TRANSFORMATIONS
360102* - Metals & Alloys- Structure & Phase Studies
360101 - Metals & Alloys- Preparation & Fabrication