J. Mater. Sci. Technol. ›› 2020, Vol. 45: 125-132.DOI: 10.1016/j.jmst.2019.11.023
• Research Article • Previous Articles Next Articles
Chengxu Wanga,b, Wei Chena,*(), Minghui Chenc,**(), Demin Chena, Ke Yanga, Fuhui Wangc
Received:
2019-08-27
Revised:
2019-09-30
Accepted:
2019-11-14
Published:
2020-05-15
Online:
2020-05-27
Contact:
Wei Chen,Minghui Chen
Chengxu Wang, Wei Chen, Minghui Chen, Demin Chen, Ke Yang, Fuhui Wang. Effect of TiN diffusion barrier on elements interdiffusion behavior of Ni/GH3535 system in LiF-NaF-KF molten salt at 700 ℃[J]. J. Mater. Sci. Technol., 2020, 45: 125-132.
C | Mo | Fe | Cr | Mn | Si | Al | W | Ti | P | S | B | Ni |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.015 | 17.1 | 4.03 | 7.03 | 0.77 | 0.59 | 0.03 | 0.02 | <0.01 | 0.004 | 0.001 | 0.0009 | bal |
Table 1 Chemical composition (wt.%) of as-received GH3535 superalloy.
C | Mo | Fe | Cr | Mn | Si | Al | W | Ti | P | S | B | Ni |
---|---|---|---|---|---|---|---|---|---|---|---|---|
0.015 | 17.1 | 4.03 | 7.03 | 0.77 | 0.59 | 0.03 | 0.02 | <0.01 | 0.004 | 0.001 | 0.0009 | bal |
Element Position | Ti | N | Cr | Fe | Ni | Mo |
---|---|---|---|---|---|---|
P1 in | 51 | 49 | - | - | - | - |
P1 in | 71.85 | 24.83 | 0.17 | 0.18 | 2.37 | 0.59 |
P1 in | - | - | - | - | 100 | - |
P1 in | 69.28 | 25.60 | 0.1 | 0.02 | 4.7 | 0.3 |
P2 in | 54.81 | 38.19 | - | - | 6.76 | 0.24 |
Table 2 Chemical composition (at.%) of TiN layer as-deposited, after annealing and after corrosion test, and Ni coating after corrosion test.
Element Position | Ti | N | Cr | Fe | Ni | Mo |
---|---|---|---|---|---|---|
P1 in | 51 | 49 | - | - | - | - |
P1 in | 71.85 | 24.83 | 0.17 | 0.18 | 2.37 | 0.59 |
P1 in | - | - | - | - | 100 | - |
P1 in | 69.28 | 25.60 | 0.1 | 0.02 | 4.7 | 0.3 |
P2 in | 54.81 | 38.19 | - | - | 6.76 | 0.24 |
Fig. 5. STEM images of the interfaces of TiN/alloy (a) and Ni/TiN (b) after annealing at 1000 ℃ for 3 h and the electron diffraction rings of the TiN layer.
Fig. 8. STEM images of the interfaces of TiN/alloy (a) and Ni/TiN (b) after corrosion in molten FLiNaK salt at 700 ℃ for 100 h and the SAD patterns of TiN and Ni4N.
Metals | Reactions | ΔG (kJ/mol) |
---|---|---|
Al | Al + TiN = AlN + Ti | 30.66 |
Cr | Cr + TiN = CrN + Ti | 203.66 |
2Cr + TiN = Cr2N + Ti | 193.62 | |
Fe | 2Fe + TiN = Fe2N + Ti | 289.21 |
4Fe + TiN = Fe4N + Ti | 282.21 | |
Ni | 3Ni + TiN = Ni3N + Ti | 332.31 |
Mo | Mo + TiN = MoN + Ti | 296.29 |
2Mo + TiN = Mo2N + Ti | 246.69 |
Table 3 The reactions of several metals with titanium nitride and their Gibbs free energy of formation (ΔG) at 700 ℃ were calculated according to the thermodynamic data from HSC Chemistry version 6.0 database.
Metals | Reactions | ΔG (kJ/mol) |
---|---|---|
Al | Al + TiN = AlN + Ti | 30.66 |
Cr | Cr + TiN = CrN + Ti | 203.66 |
2Cr + TiN = Cr2N + Ti | 193.62 | |
Fe | 2Fe + TiN = Fe2N + Ti | 289.21 |
4Fe + TiN = Fe4N + Ti | 282.21 | |
Ni | 3Ni + TiN = Ni3N + Ti | 332.31 |
Mo | Mo + TiN = MoN + Ti | 296.29 |
2Mo + TiN = Mo2N + Ti | 246.69 |
Fig. 10. EDS line scans (a), (b) for Cr and Fe of the cross section of the Ni/TiN coated GH3535 alloy after corrosion in molten FLiNaK salt at 700 ℃ for 100 h, and the diffusion coefficients of Cr (c) and Fe (d) in TiN diffusion barrier at 700 ℃.
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