[Water-Oxygen Corrosion] Investigation of the Influence of Water Vapor on the Alumina Phase Transformation in NiAl Alloys Grown at 950°C

The research team led by Professor Guo Hongbo at the Key Laboratory of Materials Science of Beijing University of Aeronautics and Astronautics has published a paper titled “Effect of water vapor on the phase transformation of alumina grown on NiAl at 950℃” in the journal Corrosion Science. The study investigates the phase transformations of NiAl alloy at 950°C under two atmospheric conditions: dry oxygen and oxygen containing 15% water vapor.

2025-03-18

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Key Laboratory of Materials Science, Beijing University of Aeronautics and Astronautics Professor Guo Hongbo’s team in the journal “ Corrosion Science 》published a paper titled “ Effect of water vapor on the phase transformation of alumina grown on NiAl at 950 degrees Celsius ” of the paper. The study analyzes NiAl Alloy In 950°C At temperature, dry oxygen and containing 15% Phase transition of water vapor in an oxygen-rich environment.

Research Background

 
NiAl Alloys are characterized by their high melting points. (1640 degrees Celsius ) and excellent high-temperature oxidation resistance, making it widely used in high-temperature applications. The oxidation resistance primarily stems from the dense layer formed on the surface. alpha- All 2 O 3 Oxide layer, But in In the low-temperature range or during the initial stage of oxidation, a metastable alumina layer forms on the surface. ( For example γ-Al₂O₃ ) . Therefore Rapidly transform metastable alumina into α-Al₂O₃ It is crucial for enhancing antioxidant capacity. Currently Some studies indicate that water vapor inhibits phase transitions, while others suggest that it accelerates them. This paper aims to investigate the effect of water vapor on NiAl On the alloy θ-Al₂O₃ toward α-Al₂O₃ The impact of phase transitions.

Research Methods

1. Experimental method:

1) NiAl The alloy is prepared by arc melting and then 1050°C Vacuum Annealing 2 hours. The sample is cut into a disc shape (diameter 10 mm , thickness 3 mm ), surface ground to 2000 eye Then wash with acetone.

2) Water-Oxygen Experiment: 950°C An isothermal oxidation experiment was then conducted. A group For pure oxygen , another group contains 15% Oxygen in water vapor. The water vapor is produced by passing through two distilled-water saturators, with a flow rate of approximately 100 ml/min 。

 

 

2. Experimental Characterization

1) Oxidation Kinetics : Measuring changes in sample weight using an electronic balance

2) Surface morphology: observed using a field-emission scanning electron microscope ( FE-SEM ) Observe the surface morphology of the oxide layer.

3) Phase analysis: using photoluminescence spectroscopy ( PSL ) Analyze the phase composition of alumina.

 

 

Fig. 3 (b) 16 h in dry O 2;  (e) 16 hours in O 2 + H 2 O ;

Research Results

1. Water vapor significantly promotes NiAl The alloy is in 950°C Generated by reduction θ-Al₂O₃ toward α-Al₂O₃ the transformation.

2. In containing 15% In steam containing oxygen, the oxide layer is denser and more uniform, resulting in superior oxidation resistance compared with a pure oxygen environment.

Central-related products

 

Tianjin Zhonghuan launches new A high-temperature static water-oxygen corrosion testing system with a high degree of integration, capable of operating at temperatures up to 1600℃ . For gases and water vapor, the flow rate is stable and controllable; currently, there are 30-300ml/min、100-1000ml/min Wait A wide range of options are available. By employing experimental testing methods, we can accurately simulate the extreme service environments experienced by turbine engine and gas-turbine alloys and coatings, conducting cyclic tests to evaluate their resistance to thermal corrosion and steam oxidation, thereby providing a reliable assessment of their thermochemical stability.

 

Digital Object Identifier ：10.1016/j.corsci.2011.05.029

 

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