Structural Features of Cast Refractory Alloy HP40NbTi High-Temperature Oxidation. Part I. Evolution of Microstructure and Phase Composition

2020 ◽  
Vol 62 (1-2) ◽  
pp. 35-45
Author(s):  
S. Yu. Kondrat’ev ◽  
S. N. Petrov ◽  
G. P. Anastasiadi ◽  
A. V. Tsemenko
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Structural Features ◽  
Refractory Alloy ◽  
Temperature Oxidation ◽  
Cast Refractory ◽  
Evolution Of Microstructure

Influences of Calcination Ambiences on Phase Composition and High Temperature Oxidation Resistance Property of Ceramic Coatings on Ti–6Al–4V Alloy by Micro-Plasma Oxidation

2007 ◽  
Vol 336-338 ◽  
pp. 2481-2483 ◽  
Author(s):  
Guo Dong Hao ◽  
Zhao Hua Jiang ◽  
Zhong Ping Yao ◽  
Heng Ze Xian ◽  
Yan Li Jiang
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Ceramic Coatings ◽  
Plasma Oxidation ◽  
Temperature Oxidation ◽  
Complete Decomposition ◽  
Weight Gains ◽  
High Temperature Calcination

Compound ceramic coatings with the main crystalline of Al2TiO5 (as-coated samples) were prepared on Ti-6Al-4V alloy by pulsed bi-polar micro-plasma oxidation (MPO) in NaAlO2 solution. The coated samples were calcined in Ar and air at 1000oC, respectively. The phase composition, morphology and element content of the coatings were investigated by XRD, SEM and XRF. The samples treated in Ar and the as-coated ones were calcined in air at 1000oC to study the oxidation resistance of the samples. The results showed that Al2TiO5 decomposed and transformed into corundum and rutile TiO2 during the high temperature calcination. Al2TiO5 decomposed very quickly in air and the proportion of Al2O3 to TiO2 was 44:55 after a complete decomposition. On the contrary, Al2TiO5 decomposed very slowly in argon with the final proportion of Al2O3 to TiO2 of 81:18 on the coating surface. The morphology of the ceramic coatings after the calcination was also different. The coatings calcined in argon were fined: the grains and pores were smaller than those of the coatings calcined in air. The weight gains of both coatings changed in the form of parabola law, and the weight gains of the coated samples treated in argon were comparatively lower than that of the as-coated samples. During the high temperature calcination, the samples treated in argon cannot distort easily, compared with the as-coated ones.

High Temperature Oxidation of the Refractory Alloy Glass Nb35Ni60Sn5.

ChemInform ◽  
2007 ◽  
Vol 38 (27) ◽  
Author(s):  
Isabella Gallino ◽  
Ralf Busch ◽  
Haein Choi Yim ◽  
Lioba Jastrow ◽  
Uwe Koester
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Refractory Alloy ◽  
Temperature Oxidation ◽  
Alloy Glass

On the phase composition changes during high temperature oxidation of Pt-modified β-NiAl at 1150°C

2012 ◽  
Vol 29 (2) ◽  
pp. 107-115 ◽  
Author(s):  
G. Smoła ◽  
J. Jedliński ◽  
J.L. Grosseau Poussard ◽  
B. Gleeson ◽  
G. Bonnet ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Composition Changes

High temperature oxidation of the refractory alloy glass Nb35Ni60Sn5

2007 ◽  
Vol 434-435 ◽  
pp. 225-228 ◽  
Author(s):  
Isabella Gallino ◽  
Ralf Busch ◽  
Haein Choi Yim ◽  
Lioba Jastrow ◽  
Uwe Köster
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Refractory Alloy ◽  
Temperature Oxidation ◽  
Alloy Glass

scholarly journals Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

2021 ◽  
Vol 8 ◽  
Author(s):  
Qing Li ◽  
Defeng Zhang ◽  
Peng Song ◽  
Zhenhua Li ◽  
Ruixiong Zhai ◽  
...  
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Oxide Scale ◽  
Hot Corrosion ◽  
Corrosion Test ◽  
High Temperature Oxidation ◽  
Aluminide Coating ◽  
Corrosion Properties ◽  
Temperature Oxidation ◽  
Oxidation And Corrosion

Aluminide coating is prepared on K438 Ni-based superalloy by pack cementation. The hot corrosion test of as-received and pre-oxidation aluminide coating in Na2SO4 salt are carried out at 1050°C. The coating morphologies, phase composition, and corrosion products are characterized by XRD, SEM, EDS, and TEM. The conclusion is that the pre-oxidation aluminide coating has excellent hot corrosion properties. After hot corrosion, the oxide scale of pre-oxidation aluminide coating is the thinnest and maintains good integrity. However, the oxide scale of as-received aluminide coating fluctuates greatly and there are corrosion cavities. CrS is formed in the alloy immediately below the oxide scale for the two coating systems.

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