OT4 titanium boriding from powder saturating media
https://doi.org/10.17073/0021-3438-2017-2-59-65
Abstract
The paper considers the possibility of using boriding media based on boron carbide additionally containing chromium, titanium and silicon, for the diffusion hardening of titanium alloys. As a comparison, boriding is conducted in amorphous boron. The paper studies the microstructure, elemental and phase composition of OT4 titanium alloy diffusion coatings produced by saturation in powder media. Hardening boride layers based on titanium alloy are obtained from saturating media based on amorphous boron and multicomponent mixtures based on boron carbide. In all cases, coating phase composition corresponds to TiB, Ti2B5 and Fe2Ti phases. It is found that 30 to 150 μm thick coatings are formed from powder mixtures by means of diffusion process in the conditions of solid-phase titanium saturation. The paper studies temperature-time conditions of OT4 titanium-based boride layer formation from powder saturating media, and determines optimum modes for functional boride coating formation. The optimum temperature range for the processes of thermochemical titanium borating (900–1150 °C) is determined along with saturation time (2,5 to 5 hours). The paper specifies the maximum thickness of a functional boride coating based on the OT4 titanium alloy: from 180 μm in case of saturation from Bamorph to 240 μm for a mixture of 50%B4C + 20%SiC + 25%CrB2 + 5%NaCl at 950 °C and a saturation time of 4 hours. It should be noted that the maximum coating thickness is the one retained on the surface of the hardened sample.
About the Authors
S. G. Ivanov
Altai State Technical University named I.I. Polzunov (AltSTU)
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Senior еngineer PSRL «SHS» Altai State Technical University named I.I. Polzunov (AltSTU) (656038, Russia, Barnaul, Lenin Ave., 46)
M. A. Guriev
Altai State Technical University named I.I. Polzunov (AltSTU)
Russian Federation
Cand. Sci. (Eng.), Doctoral student PSRL «SHS» of AltSTU
Russian Federation
Cand. Sci. (Eng.), Doctoral student PSRL «SHS» of AltSTU
M. V. Loginova
Altai State Technical University named I.I. Polzunov (AltSTU)
Russian Federation
Cand. Sci. (Eng.), Senior researche PSRL «SHS» of AltSTU
Russian Federation
Cand. Sci. (Eng.), Senior researche PSRL «SHS» of AltSTU
V. B. Deev
National Research Technological University «MISiS»
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Prof. of the Department «Foundry technology and art materials processing» of National Research Technological University «MISiS» (119049, Russia, Moscow, Leninsky prospect, 4)
A. M. Guriev
Altai State Technical University named I.I. Polzunov (AltSTU)
Wuhan Textile University
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Prof. of the Department «Descriptive geometry and graphics» of AltSTU, Prof. of Wuhan Textile University (Wuhan, China)
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Review
For citations:
Ivanov S.G., Guriev M.A., Loginova M.V., Deev V.B., Guriev A.M. OT4 titanium boriding from powder saturating media. Izvestiya. Non-Ferrous Metallurgy. 2017;(2):59-65. (In Russ.) https://doi.org/10.17073/0021-3438-2017-2-59-65
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