Main directions of wear-resistant coatings on steel products in diffusion metallization
DOI:
https://doi.org/10.37142/2076-2151/2019-2(49)189Keywords:
diffusion metallization; complete saturation of boron; chromium; aluminum; powder mixture; wearAbstract
Diachenko Y. G. Main directions of wear-resistant coatings on steel products in diffusion metallization // Material working by pressure. – 2019. – № 2 (49). - P. 189-194.
The theoretical analysis of the coatings obtained integrated saturation boron, chromium and aluminum in various mixtures with saturating position of their durability. Analyzed methods for preparing coatings simultaneously boron and chromium, boron and aluminum and boron, chromium, aluminum diffuse after metallization. It has been shown that one of the methods of applying the coatings is a complex diffuse saturation in powder mixtures based on boron. Revealed the composition of the surface layer with simultaneous saturation of boron and chromium, boron and aluminum and boron, chromium, aluminum, which allows to form on the surface of the high hardness coating parts. As a result, the theoretical analysis revealed that the layers on the basis of boron and chromium, obtained by different methods should be divided into three types: 1) iron-based boride (Fe, Cr) 2B, (Fe, Cr) B; 2) based on chromium boride (Cr, Fe) 2B, (Cr, Fe) B; 3) based on α - solid solution of chromium in the iron and boron with inclusions of boride. After saturation with boron and aluminum coatings are formed, which consist of three distinct layers: an outer layer with high content of aluminum, transition layer aluminum - iron, and an inner layer of boron - iron. The surface layer after diffusion metallization simultaneously boron, chromium and aluminum is composed of a mixture of small dispersed carbides and borides (HV 900 ... 1000) on a soft base. The introduction of the third component of the powder mixture allowed to form on the surface of the wear-resistant coating articles with desirable properties. The most promising is the complex process of saturation with boron, chromium and aluminum, when it is possible to minimize the energy costs of the process and to get the maximum effect of improving the wear resistance of metal.
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