MODELING PRODUCTION OF CORROSION RESISTANT DIFFUSION LAYERS UNDER NON-STATIONARY TEMPERATURE CONDITIONS

Дмитро Борисович Середа

doi:10.31319/2519-8106.2(43)2020.219267

Abstract

The paper discusses methods for obtaining alloyed chromium-alloyed coatings and the search for optimal powder mixtures that allow the formation of protective coatings on CCCM under non-stationary temperature conditions. Refractory compounds, primarily carbides, borides, nitrides and silicides, as well as alloys based on them, can be promising materials for applying protective coatings. In addition to protection against oxidation, coatings made of refractory compounds have high hardness and wear resistance. The implementation of the application of protective coatings on high-carbon materials is difficult for a number of reasons. This concerns the low wettability of the carbon surface by refractory metals, low adhesion of the coating to the substrate, which largely depends on the thermophysical properties of the coating, and also the choice of coating components depending on the operating conditions of the finished product. Under non-stationary temperature conditions, it is possible to obtain coatings of various chemical compositions by varying the amount and content of alloying additives. The gas-transport method of applying coatings using UTC makes it possible to obtain CCCM with enhanced physical and mechanical properties, without requiring high energy costs and time.

Highlights

В роботі розглянуті методи отримання легованих хромоалітірованних покриттів і пошук оптимальних порошкових шихт, що дозволяють формувати захисні покриття на ВВКМ при нестаціонарних температурних умовах
carbon-carbon composite materials (CCCM) matrix and a carbide phase is formed, while the mechanical characteristics of the material change, and it should be taken into account that the carbide component is formed unevenly along section of the main material
The implementation of the application of protective coatings on high-carbon materials is difficult for a number of reasons

Summary

Introduction

В роботі розглянуті методи отримання легованих хромоалітірованних покриттів і пошук оптимальних порошкових шихт, що дозволяють формувати захисні покриття на ВВКМ при нестаціонарних температурних умовах. При нестаціонарних температурних умовах можливе отримання покриттів різного хімічного складу, варіюючи кількість і зміст легуючих добавок. Газотранспортний метод нанесення покриттів при нестаціонарних температурних умовах, дозволяє отримати ВВКМ з підвищеними фізико-механічними властивостями, не вимагаючи високих енерговитрат і часу. Problem’s Formulation The practical use of carbon-carbon composite materials (CCCM) in high-temperature processes is very limited due to strong oxidation, as well as erosion and burnout in gas streams. The implementation of the application of protective coatings on high-carbon materials is difficult for a number of reasons This concerns the low wettability of the carbon surface by refractory metals, low adhesion of the coating to the substrate, which largely depends on the thermophysical properties of the coating, and the choice of coating components depending on the operating conditions of the finished product. To date, many technologies have been developed for the application of protective coatings on carbon materials using the methods of chemical thermal treatment (CHT), as well as impregnation from the liquid phase

Objectives

Findings

Conclusion