添加Al和B和不添加Al和B时mo -硅化物涂层的被动-主动氧化行为

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-26 DOI:10.1016/j.corsci.2025.113362

J.R. Becker, J.H. Perepezko

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引用次数: 0

摘要

分析了包层胶结法制备的mo -硅化物涂层的活性氧化行为，评价了单独添加Al或B，以及在SiO2中同时添加Al和B的效果。涂层在1500°C和Po2= 10−4 atm下测试，持续时间为2、4、6、8和20 h。涂层经过预氧化，主要由二氧化硅氧化膜组成。经过20 h后，每层由一层较厚的SiO2组成，其次是Mo5Si3。热力学分析确定了MoSi2、Mo5Si3和Mo3Si相从被动到主动的转变。此外，该模型还针对SiO2中的添加剂进行了修正，这解释了为什么在低添加水平下，每种涂层的最终微观结构几乎没有差异，并表明高碱性添加剂可以产生更高的被动到主动转变温度。

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Passive-to-active oxidation behavior of Mo-silicide coatings with and without Al and B additions

The active oxidation behavior of Mo-silicide coatings produced by pack cementation was analyzed to evaluate the effect of separate Al or B additions, and both Al and B additions in the SiO₂ scale. The coatings were tested at 1500°C and Po₂= 10⁻⁴ atm for durations of 2, 4, 6, 8, and 20 h. The coatings were preoxidized and consisted of mostly MoSi₂ with a silica scale. After 20 h, each coating consisted of a thick SiO₂ layer, followed by Mo₅Si_3. A thermodynamic analysis was conducted to determine the passive-to-active transition for the MoSi₂, Mo₅Si₃, and Mo₃Si phases. Additionally, the model was modified for additives in SiO₂, which explains why with low levels of additions, little difference was seen in the final microstructure of each coating and indicates that additives with a high basicity can yield a higher passive-to-active transition temperature.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.