High-temperature oxidation of silicide-aluminide layer on the TiAl6V4 alloy prepared by liquid-phase siliconizing

Low carbon steel was coated by hot-dipping into a molten Al-10%Si bath. The high-temperature oxidation was performed at 700oC for 1 h to 49 h in air, air +100% H2O, and air + 30% ethanol under atmospheric pressure. An elemental composition distribution, morphologies of the aluminide layer and the oxide scale were characterized by OM, XRD, and SEM/EDS. After hot-dipping treatment, the coating layers consisted of Al, Si, FeAl3, τ5-Fe2Al8Si, and Fe2Al5. The results of high temperature oxidation tests showed the oxidation rate were parabolic law in three different atmospheres. The polyhedral τ1-(Al,Si)5Fe3 formed at a short time oxidation completely transformed to FeAl2 and FeAl due to the composition gradient and the chemical diffusion. The effect of water vapor on the oxidation resistance of the Al-Si coating may be attributed to increase in Al and Fe ions transport, leading to loss of protective aluminide layer by formation of iron oxide nodules on the coating surface and at interface between aluminide layer and the steel substrate.

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High-temperature oxidation of transient-liquid phase bonded Ni-based alloys in 1 bar and 250 bar carbon dioxide

Materials at High Temperatures ◽

10.1080/09603409.2020.1818046 ◽

2020 ◽

Vol 37 (6) ◽

pp. 445-461

Author(s):

Casey S. Carney ◽

Richard P. Oleksak ◽

Monica Kapoor ◽

Gordon R. Holcomb ◽

Ömer N. Doğan

Keyword(s):

Carbon Dioxide ◽

High Temperature ◽

Liquid Phase ◽

High Temperature Oxidation ◽

Transient Liquid Phase ◽

Temperature Oxidation

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An Investigation on High-Temperature Oxidation and Hot Corrosion Resistance Behavior of Coated TLP (Transient Liquid Phase)-Bonded IN738-LC

Transactions of the Indian Institute of Metals ◽

10.1007/s12666-018-1390-0 ◽

2018 ◽

Vol 71 (12) ◽

pp. 2903-2918 ◽

Cited By ~ 3

Author(s):

Reyhaneh Sahraeian ◽

Hamid Omidvar ◽

S. M. Mehdi Hadavi ◽

Sajad Shakerin ◽

Vahid Maleki

Keyword(s):

Corrosion Resistance ◽

High Temperature ◽

Liquid Phase ◽

Hot Corrosion ◽

High Temperature Oxidation ◽

Transient Liquid Phase ◽

Temperature Oxidation

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Process and High-Temperature Oxidation Resistance of Pack-Aluminized Layers on Cast Iron

Metals ◽

10.3390/met9060648 ◽

2019 ◽

Vol 9 (6) ◽

pp. 648 ◽

Cited By ~ 3

Author(s):

Xing Wang ◽

Yongzhe Fan ◽

Xue Zhao ◽

An Du ◽

Ruina Ma ◽

...

Keyword(s):

Cast Iron ◽

High Temperature ◽

Oxidation Resistance ◽

High Temperature Oxidation ◽

Mass Gain ◽

Spheroidal Graphite ◽

Temperature Oxidation ◽

Graphite Cast Iron ◽

Pack Aluminizing ◽

Aluminide Layer

Pack aluminizing of spheroidal graphite cast iron with different aluminizing temperature and time was studied. Results showed that the thickness of aluminized layer increased with the increasing temperature and time. The optimized process parameters are as follow: the aluminizing packed temperature is 830 °C and the time is 3 h. The aluminized layer consisted of the inner FeAl and the outer Fe2Al5. Some graphite nodules were observed in the aluminide layer after aluminizing. The mass gain of the aluminized cast iron was 0.405 mg/cm2, being 1/12 of the untreated substrate after oxidation. The high temperature oxidation resistance can be improved effectively by pack aluminizing, even though there were graphite nodules in the aluminide layer.

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