Microstructure and super oxidation resistance of the network structured Ti-Al-Si coating

Li, X.T.; Huang, Lujun; Jiang, Shimei; Yong-liang, Gao; An, Qi; Wang, Shan; Zhang, R.; Li, Geng

doi:10.1016/j.jallcom.2019.151679

Cited by 26 publications

(6 citation statements)

References 31 publications

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“…This layer was synthesized via hotdip coating of the alloy in the aluminum-10 silicon (at. %) melt at 800°C and then heat-treated at 550 °C for 6 h [22]. These results indicate that the cooling rate of the samples after completion of the hot dipping has a great influence on the phase composition of the coatings.…”

Section: The Formation Mechanismmentioning

confidence: 76%

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The influence of silicon content on the microstructure and high‐temperature oxidation behavior of aluminum‐silicon coatings on Ti‐6Al‐4 V alloy by hot dipping route

Shi,

Su,

Chen

et al. 2023

Materialwissenschaft Werkst

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The poor high‐temperature oxidation properties of Ti‐6Al‐4 V (titanium‐aluminum‐vanadium) alloy limit its applications under high‐temperature components of aero‐engines. In this study, the aluminum‐silicon coatings with different silicon content were fabricated on titanium‐aluminum‐vanadium alloy via the hot dipping route. A metallurgical bond was established at the interface between aluminum‐silicon coatings and substrates following the hot dipping. The results showed that three different coatings were formed: titanium(aluminum, silicon)3+ liquid‐(aluminum, silicon), titanium(aluminum, silicon)3+ τ2+ liquid‐(aluminum, silicon) and τ1+ τ2+ liquid‐(aluminum, silicon). Furthermore, the formation of aluminum‐silicon coatings was analyzed by diffusion path theory. The coated alloy was subjected to a high‐temperature oxidation test at 850 °C, and the weight gains were only 5.1 % to 22.4 % of the bare alloy. The coatings improved the high‐temperature oxidation resistance of titanium‐aluminum‐vanadium alloy. The most favorable oxidation behavior was noticed for the titanium(aluminum, silicon)3+liquid‐(aluminum, silicon) coatings. The higher the silicon content in titanium(aluminum, silicon)3+liquid‐(aluminum, silicon) coatings, the more excellent high‐temperature oxidation resistance was achieved.

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Section: The Formation Mechanismmentioning

confidence: 76%

“…Only the titanium(aluminum) 3 intermetallic phase exists (ICDD no. 65-4505), in which the aluminum atoms in titanium(aluminum) 3 are partially substituted by the silicon atoms [22]. The content of silicon in the titanium(aluminum) 3 in the aluminum-4 silicon (at.…”

Section: Microstructural Characterization Of Coatingsmentioning

confidence: 99%

The influence of silicon content on the microstructure and high‐temperature oxidation behavior of aluminum‐silicon coatings on Ti‐6Al‐4 V alloy by hot dipping route

Shi,

Su,

Chen

et al. 2023

Materialwissenschaft Werkst

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“…Combined with the XRD diffraction results (Figure 2) and the EDS results (Table 1), the reaction layer is TiAl 3 (ICDD PDF#65-4505), and the aluminum atoms in TiAl 3 are partially substituted by the silicon atoms. [24] For descriptive convenience, the TiAl 3 phases in this study with different solid-solution silicon content are denoted with Ti(Al,Si) 3 phases. It can be seen from Table 1 that from the Al-Si liquid phases to the Ti(Al,Si) 3 phases, the Si content decreases gradually.…”

Section: Analytical Characterizationmentioning

confidence: 99%

Effects of carbon addition on Ti–Al–Si coatings synthesized by self‐generated gradient hot‐dipping infiltration method

Shi

Zhu

et al. 2023

Materials & Corrosion

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The effects of carbon addition on the microstructure and oxidation resistance of Ti–Al–Si coatings synthesized by the self‐generated gradient hot‐dipping infiltration method were studied. The microstructure, phase structure, as well as composition of the coating, were observed by using X‐ray diffraction, scanning electron microscope, and energy dispersive spectrometer. It was found that when carbon was added into the Al‐SiO2 system, the coating was composed of L‐(Al,Si) phase and Ti(Al,Si)3 phase. The thickness of the Ti(Al,Si)3 phase layer increased along with the dipping time. The cycle oxidation tests at 900°C for 160 h showed that the weight gains of the coating samples were only 8.1% of that of the Ti–6Al–4V alloy samples. This result indicates that the coatings remarkably enhanced the oxidation resistance of Ti–6Al–4V alloy, which could be ascribed to two reasons: (1) the mixed oxidation zone of Al2O3, Ti(Al,Si)3, and Ti5Si3 on top of the oxidized coating could act as a barrier to retard the diffusion of oxygen to the substrate; and (2) several new phase layers (Ti3Al, TiAl, and Ti5Si3 + TiAl2) near the substrate during oxidation could reduce the cracks at the bottom of the oxidized coating.

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“…Ti(Al,Si) 3 coating of about 25 µm in thickness was deposited onto a titanium matrix composite substrate by hot-dip siliconising of the substrate in the Al-10Si melt, followed by annealing at 550 • C for 6 h [43]. The microstructure and oxidation resistance of the coatings were studied under cyclic oxidation at 700-900 • C. The oxidation kinetics of the Ti(Al,Si) 3 coatings followed the parabolic law for all tested oxidation temperatures.…”

Section: Oxidation At 600-800 • Cmentioning

confidence: 99%

A Short Review on the Phase Structures, Oxidation Kinetics, and Mechanical Properties of Complex Ti-Al Alloys

et al. 2021

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This paper reviews the phase structures and oxidation kinetics of complex Ti-Al alloys at oxidation temperatures in the range of 600–1000 °C. The mass gain and parabolic rate constants of the alloys under isothermal exposure at 100 h (or equivalent to cyclic exposure for 300 cycles) is compared. Of the alloying elements investigated, Si appeared to be the most effective in improving the oxidation resistance of Ti-Al alloys at high temperatures. The effect of alloying elements on the mechanical properties of Ti-Al alloys is also discussed. Significant improvement of the mechanical properties of Ti-Al alloys by element additions has been observed through the formation of new phases, grain refinement, and solid solution strengthening.

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Microstructure and super oxidation resistance of the network structured Ti-Al-Si coating

Cited by 26 publications

References 31 publications

The influence of silicon content on the microstructure and high‐temperature oxidation behavior of aluminum‐silicon coatings on Ti‐6Al‐4 V alloy by hot dipping route

The influence of silicon content on the microstructure and high‐temperature oxidation behavior of aluminum‐silicon coatings on Ti‐6Al‐4 V alloy by hot dipping route

Effects of carbon addition on Ti–Al–Si coatings synthesized by self‐generated gradient hot‐dipping infiltration method

A Short Review on the Phase Structures, Oxidation Kinetics, and Mechanical Properties of Complex Ti-Al Alloys

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