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CREATION OF WEAR-RESISTANT COMPOSITES COATED ON THE BASIS OF POWDER-BASED SELF-FLOWING ALLOYS BY ELECTRO-CONTACT SINTERING

CREATION OF WEAR-RESISTANT COMPOSITES COATED ON THE BASIS OF POWDER-BASED SELF-FLOWING ALLOYS BY ELECTRO-CONTACT SINTERING

Abstract

The paper examines the process of increasing the functional properties of coatings made from powders of self-fluxing alloys by using the method of electric contact sintering. It has been shown that the adhesive strength of the coatings is high. with the base is ensured by the formation of a wide diffusion zone on the side of the base. There is no liquid phase at the coating-part boundary. This indicates that, unlike surfacing, during electrical contact sintering there is no overheating and no mixing zone of the coating material with the metal of the part. X-ray study of the phase composition of coatings shows that under optimal conditions of electric contact sintering, the carbides present in the original powder are mainly retained in the sintered layer, which indicates the preservation of the hereditary properties of the coating material during electric contact sintering. The effect of grinding the carbide phase makes it possible to obtain sintered layers with evenly distributed carbide inclusions, which helps to increase the wear resistance of coatings. Carbide particles have a specific acute-angled shape, which indicates the preservation of the original properties and structure of the coating material during electrical contact sintering. Impulse temperature-force influence in the process of coating formation during electric contact cauterization leads to the dispersion of solid phase particles, which helps to increase the microhardness and wear resistance of the obtained coatings by 2-3 times. The developed technology for obtaining coatings from self-fluxing alloy powders by electric contact sintering leads to a decrease in the cost of manufacturing and restoration of parts due to the replacement of alloy steel with low-carbon steel with coatings from SFP SFS while increasing the resource of parts by 3-5 times. У роботі розглядається процес підвищення функціональних властивостей покриттів із порошків сплавів, що самофлюсуються, шляхом використання методу електроконтактного припікання. Показано, що найвища міцність зчеплення покриттів. з основою забезпечується за рахунок створення з боку основи широкої дифузійної зони. На межі покриття – деталь не має місця наявність рідкої фази. Це свідчить про те, що, на відміну від наплавлення, при електроконтактному припіканні немає місця перегрів і зона перемішування матеріалу покриття з металом деталі. Рентгенографічне вивчення фазового складу покриттів, показує, що при оптимальних режимах електроконтактного припікання в спеченому шарі в основному зберігаються карбіди, присутні в вихідному порошку, що свідчить про збереження спадкових властивостей матеріалу покриття при електроконтактному припіканні. Ефект подрібнення карбідної фази дозволяє отримувати спечені шари з рівномірно розподіленими карбідними включеннями, що сприяє збільшенню зносостійкості покриттів. Карбідні частинки мають специфічну гострокутну форму, що свідчить про збереження вихідних властивостей та структури матеріалу покриття при електроконтактному припіканні.

Keywords

зносостійкі покриття, wear-resistant coatings, electric contact cauterization, composite coatings, самофлюсуючі сплави, зносостійкість, self-fluxing alloys, композиційні покриття, wear resistance, електроконтактне припікання

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    popularity
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
bronze