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Electrochemical Formation of Wear-Resistance Iron Composition with High-Strength Microparticles.


Author: Borţoi Tudor
Degree:doctor of engineering
Speciality: 02.00.05 - Electrochemistry
Year:2011
Scientific adviser: Alexandru Dicusar
doctor habilitat, professor, Institute of Applied Physics of the ASM
Institution: Institute of Applied Physics of the ASM
Scientific council: DH 02-02.00.05-27.03.08
Institute of Applied Physics of the ASM

Status

The thesis was presented on the 16 December, 2010
Approved by NCAA on the 31 March, 2011

Abstract

Adobe PDF document0.58 Mb / in romanian

Keywords

composition, matrix, disperse phase, high-strength microparticles, universal equipment, cathode macrolevel, functional structure, fatigue friction-sliding

Summary

The paper includes the introduction, five chapters, general conclusions, recommendations, 141 references titles, 107 pages of the main text and 29 figures. The obtained results have been reported in 43 scientific papers.

Key Words: composition, matrix, disperse phase, high-strength microparticles, universal equipment, cathode macrolevel, functional structure, fatigue friction-sliding.

The research relates to the electrochemistry of the wear-resistant iron compositions.

The main aim of the research is to study to investigate process of formation of the iron-based composition with the high-strength microparticles using a universal equipment applicable to the technologies of strengthening and reconditioning of the wearing surfaces of the machine work-pieces and instruments of production.

The tasks of the research are 1) to find electrolyte for the iron-plating and investigate the process of formation at a macrolevel of the iron composition using a universal equipment; 2) testing the functional structure of the iron composition with the high-strength microparticles for the fatigue friction-sliding; to use the results in the technologies of strengthening and reconditioning of the surfaces that are exposed to wear.

Scientific novelty and originality of the obtained results: The developed methods have been used to study for the first time: the process of formation and distribution at the macrolevel of the composition; the functional structure; relaxation processes of the remaining tensions and the processes of strengthening and weakening of the materials exposed to wear.

Theoretical significancy: The effect of oscillation of the relaxation processes of the remaining tensions has been discovered; the dependency of the functional structure of the wear-resistant composition on the concentration and density of the distribution of the disperse phase was determined; the effect of a cyclic recurrence was established in the processes of strengthening and weakening of the wearing compositions with a structure of the disperse phase near functional.

Practical significance: the new methods are offered for the study and estimation of the electrolyte properties, electrochemical coatings and modes for electrolysis of the latter. The scientific results have been introduced into the developed requirements to the electolytes of iron plating using the compositions; to the facilities and the set up and modes of the electrolysis for the technologies of strengthening and reconditioning of the machine work-pieces and instruments of production using the wear-resistant composites