Application of carbide coatings to hard-metal tools

Loskutov, V. F.; Byakova, A. V.; Khizhnyak, V. G.; Mukha, I. M.; Proskurnin, A. F.

doi:10.1007/bf00800524

Cited by 1 publication

(15 citation statements)

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“…The chemical compounds used as transporters and suppliers of diffusing elements are halides, carbonyls, and organic compounds. The process is carried out at temperatures of 900-1500 • C for 2-50 h [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…It is known that, during the application of diffusion coatings, mass exchange occurs between the material being processed and the active medium formed in the reaction space during chemical heat treatment. At the same time, chemical reactions associated with mass exchange occur [9,26,27]. The flow of chemical reactions is possible simultaneously and sequentially, in the volume of the gas phase, at the interface with the material being processed, and even in the volume of the material itself.…”

Section: Introductionmentioning

confidence: 99%

“…Works [8,9,26] show that, for a complete analysis of saturation processes, it is advisable to determine the equilibrium composition of the gas phase in a wide temperature range, including saturation temperatures. The obtained thermodynamic calculations make it possible to determine the process's principle possibility and select some technological parameters (temperature, pressure, concentration of components in the initial mixture).…”

Section: Introductionmentioning

confidence: 99%

“…In many works, the software is used to determine the probable phase composition of coatings and saturating medium, the calculations of which are based on the entropy estimation of the closed system in works [9,[26][27][28]. According to the second law of thermodynamics, the system with the minimum Gibbs energy or the maximum entropy will be thermodynamically advantageous among all possible systems.…”

Section: Introductionmentioning

confidence: 99%

“…In works [8,9,26], the physicochemical basis of applying one-component and twocomponent coatings based on carbides of transition metals on the surface of steels and hard alloys was investigated. Based on the data of thermodynamic analysis of chemical reactions occurring in the reaction space, methods and compositions of starting reagents for applying carbide coatings to the surface of steels and alloys in a closed reaction space at a reduced pressure of the active gas phase have been developed.…”

Section: Introductionmentioning

confidence: 99%

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Physicochemical Conditions of Boron–Siliconizing of Molybdenum-Based Alloys in Chlorine and Fluorine Medium

Loskutova,

Scheffler,

Ivanov

et al. 2024

Metals

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The physicochemical conditions of the siliconizing and boron–siliconizing processes of molybdenum-based alloys in a closed reaction space in an environment of chlorine and fluorine at reduced pressure were studied. Theoretical calculations of the equilibrium composition of systems with the participation of silicon, boron, molybdenum, nitrogen, oxygen, chlorine, and fluorine were carried out, which made it possible to determine the influence of process parameters (temperature, composition of the reaction medium) on the probable phase composition of the obtained coatings. Based on thermodynamic calculations, the composition and rational consumption of the initial powders and the temperature intervals of the chemical heat treatment (CHT) during the complex saturation of molybdenum-based alloys with silicon and boron were modeled. It was established that it is advisable to use chlorine as an activator, which leads to the formation of molybdenum chlorides MoCl4 and MoCl3 in the composition of the gas phase and can indicate the flow of exchange reactions between chlorides and the matrix of the processed material in the reaction space. The rational saturation temperature of alloys based on molybdenum with silicon and boron is determined—1100–1250 °C. The possibility of the existence of condensed phases MoSi2, MoB2.15, B6Si, MoB1.65, and MoB is shown.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%