Titanium-silicon coatings and their influence on the efficiency of machine parts

Berezhnitskaya, M. F.; Nochovnaya, N. А.; Eizner, B.A.; Иванов, Ю А; Petranyuk, I. Ya.

doi:10.1007/bf00558774

Mater Sci

1994

DOI: 10.1007/bf00558774

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Titanium-silicon coatings and their influence on the efficiency of machine parts

M. F. Berezhnitskaya¹,

N. А. Nochovnaya²,

B.A. Eizner³

et al.

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2009

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“…To increase the fatigue strength, it is customary to use various superhard coatings applied by the methods of physical (PVD) and chemical (CVD) vapor deposition [11]. Titanium silicide (TiSi) coatings deposited by the PVD method enhance the fatigue crack-growth resistance of VT8 titanium alloys and their resistance to contact-fatigue fracture [12]. For WC-Co plasma coatings, the increase in the fatigue strength depends on the thickness of the coating.…”

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Fatigue of VT20 titanium alloy with vacuum-plasma coatings at high temperatures

2009

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629.7.083 and N. V. LipinskayaWe study the influence of vacuum-plasma TiN, (TiAl) N, and (TiC)N coatings on the high-cycle fatigue of VT20 titanium alloy in the temperature range 350-640°C for a loading frequency of 10 kHz. It is shown that, in this temperature range, the fatigue limits of VT20 alloy with the indicated coatings 6 mm in thickness become 15-25% higher than for the material without coating. The possibility of replacement of steel blades with titanium blades with vacuum-plasma coatings is demonstrated.The experience of operation of gas-turbine plants (GTP) shows that the insufficiently high fatigue resistance is the main cause of fracture of their working elements. In particular, this is true for the resistance to thermomechanical fatigue caused by the process of gradual accumulation of defects in the material under the conditions of simultaneous action of variable loads, aggressive media, and temperature [1].Titanium alloys have broad prospects for application as structural materials of gas-turbine plants due to their high specific strength within wide ranges of operation temperatures. At temperatures of 500-600°C, the indicated characteristic of titanium alloys is higher than that of any other structural materials, including superalloys [2]. However, their practical application is restricted by the insufficient erosion resistance and resistance to highfrequency vibration loads at temperatures higher than 550°C. Therefore, as one of the methods used for the solution of the problem of increasing the serviceability of Ti alloys, one can mention the application of coatings. Parallel with protection against the action of aggressive ambient media, they exert a direct influence on the surface hardening of workpieces because the expected results cannot always be attained by the ordinary procedures of hardening. Thus, as temperature increases, the procedure of cold-work hardening can decrease the fatigue strength of the material. Moreover, the larger the degree of cold-work hardening and the time of action of cyclic loading, the more pronounced the indicated decrease in the fatigue strength [3]. Note that the finishing-hardening procedures of surface treatment [4][5][6][7] and, especially, vacuum-plasma technologies [8,9], are now used more and more extensively.The opinions of the researchers concerning the influence of coatings on the strength of the base material are contradictory. Thus, it is assumed [10] that the mechanical properties of almost all coatings are lower than the corresponding properties of the protected alloys and their strength noticeably decreases at high temperatures. This negatively affects the strength of the base material, and the decrease in its fatigue resistance is especially pronounced. To increase the fatigue strength, it is customary to use various superhard coatings applied by the methods of physical (PVD) and chemical (CVD) vapor deposition [11]. Titanium silicide (TiSi) coatings deposited by the PVD method enhance the fatigue crack-growth resistance of VT8 titanium alloy...

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Fatigue of VT20 titanium alloy with vacuum-plasma coatings at high temperatures

2009

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Titanium-silicon coatings and their influence on the efficiency of machine parts

Cited by 1 publication

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Fatigue of VT20 titanium alloy with vacuum-plasma coatings at high temperatures

Fatigue of VT20 titanium alloy with vacuum-plasma coatings at high temperatures

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