[User Results] Under High-Temperature Steam “The Protective Shield” — Unveiled 14YWTZS The Secret Behind the Alloy’s Exceptional Oxidation Resistance

Digital Object Identifier ： 10.1016/j.corsci.2025.112906

Professor Shen Tongde’s team at Yanshan University in the journal “ Corrosion Science 》published a paper titled “ Enhanced oxidation resistance of nanocrystalline ODS ferritic alloy in high-temperature steam through addition of a small amount of Si “’s paper. The study analyzes Zirconium - Silicon alloy (14YWTZS) Strong antioxidant performance exhibited in high-temperature steam.

Research Background

ODS Alloys are regarded as promising materials for next-generation advanced nuclear reactors, such as supercritical water-cooled reactors, due to their outstanding high-temperature strength, creep resistance, and radiation resistance. SCWR ) as the key structural material. However, traditional ODS The oxidation resistance of alloys in high-temperature steam environments remains inadequate, particularly in Cr At higher concentrations, it may induce thermal embrittlement and irradiation embrittlement. By developing a low-concentration Yes Synergistic effects of alloying to develop a novel nanocrystalline material ODS Alloy (14YWTZS) , significantly enhancing its position in 650 degrees Celsius The antioxidant performance in high-temperature steam environments and the underlying oxidation mechanism are elucidated.

Experiment Method

50. Preparation process: Inside an argon-atmosphere glove box , the powder mixture and steel balls are placed in SPEX 8000D Vibratory high-energy ball mill, with 1425 rpm the rotational speed of 24 Hour-long mechanical alloying treatment. At 900 °C and 4 GPa Sintering under high-pressure conditions 30 minutes.
50. High-Temperature Water-Oxygen Test

Use High-Temperature Static Water-Oxygen Corrosion Tester from Tianjin Zhonghuan Conduct testing, 5 × 5 × 1.5 mm ³ The sample is placed inside the reaction chamber, and 650 °C, Ar-20 % H ₂ O (vol%) under the conditions of, carry out 1 to 1000 hours Steam oxidation test.

Discussion and Mechanisms

50. Yes The Critical Nature of Alloying: Low Content Yes ( 1 wt% ) can then form a continuous Silicon dioxide Layer, excess Yes It will impair the mechanical properties. Moreover, Silicon dioxide The amorphous structure is more... than the crystalline one. Cr ₂ O ₃ More resistant to ion penetration.
50. Oxide Layer Evolution Process

1. Early stage: Yes Formed by rapid diffusion along grain boundaries Silicon dioxide ，Mn/Cr It diffuses outward to form an outer spinel layer.
2. Mid-term phase: Chromium(III) oxide Layer formation, Fe Exclusion leads to the formation of isolated particles.
3. Long-term phase: Yes Continuous out-migration has resulted in Mn₂SiO₄ The outermost layer, Silicon dioxide The inner layer thickens to 28 nm。

Summary

This study, through “ Nanocrystal + Low “Yes” strategy, successfully designed to resist high-temperature oxidation ODS Alloys provide important reference for the development of nuclear materials.

Tianjin Zhonghuan launches High-temperature static / High-Speed Water-Oxygen Corrosion Testing Equipment Series , using laboratory testing methods , Accurately simulating the high-temperature, high water-vapor partial-pressure, and high water-vapor velocity conditions of a turboengine operating environment, this equipment conducts cyclic tests on material thermal corrosion and steam oxidation corrosion to properly evaluate the material’s thermochemical stability. The system comprises an intake-control unit, a liquid-precision-dosing unit for precise control of liquid feed, a heated evaporator that ensures uniform vaporization of water and thorough gas mixing, trace-heating pipelines, and a heating reactor, among other components. It is primarily used for : Various functional ceramics, structural ceramics and ceramic matrix composites, ultra-high-temperature alloy materials, and high-temperature thermal barrier coatings, among others.

Static water oxygen:

·Precise and controllable vaporization of liquid water

·Multiple flow ranges available for the carrier gas: 300ml/1000ml/3000ml

· Maximum temperature options: 1200℃/1600℃/1800℃

· Multiple process sets can be preconfigured, with each set 50 Program segment Control

High-speed water oxygen:

·Achieving steam impingement: 160m/s ( Calculated value)

·Precise control of liquid inflow

·Uniform vaporization of liquid water and gas mixing