Pub Date : 2024-08-27DOI: 10.1007/s11085-024-10303-5
Abdul Latif, Mitsutoshi Ueda, Masao Takeyama
As part of advancing oxygen–hydrogen combustion power generation technology, a study was carried out to evaluate the oxidation behavior of a novel developed Ni–Cr–W alloy as the structural material candidate. Tungsten is utilized in the alloy as a solid solution-strengthened element and as an α2-W precipitate former. The examination involved exposing the developed alloy and commercial alloys, Hastelloy X and Nimonic 263, to air and steam environments at 1273 K. The results show a different oxidation behavior of the developed alloy. Considering the air oxidation kinetics, the performance of the developed alloy was on par with that of Hastelloy X and superior to Nimonic 263. A single outer chromia scale was established with an intergranular oxide. Whereas steam exposure resulted in the formation of outer and inner chromia scales with a deeper intergranular oxide penetration. Thicker chromia formation with a lower mass gain indicates the evaporation of chromia under a steam atmosphere.
作为推进氢氧燃烧发电技术的一部分,一项研究对作为候选结构材料的新型 Ni-Cr-W 合金的氧化行为进行了评估。钨作为固溶强化元素和α2-W沉淀前体用于合金中。测试包括将开发的合金和商用合金(哈氏合金 X 和尼莫克 263)暴露在 1273 K 的空气和蒸汽环境中。考虑到空气氧化动力学,所开发合金的性能与哈氏合金 X 相当,而优于 Nimonic 263。形成了单一的外铬垢和晶间氧化物。而蒸汽暴露会形成内外铬鳞,晶间氧化物渗透更深。铬鳞形成较厚,但质量增加较少,这表明铬在蒸汽环境下蒸发。
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Pub Date : 2024-08-25DOI: 10.1007/s11085-024-10302-6
S. Hervier, M.-M. Desagulier, D. Monceau
A study on the effect of bond coating (BC) surface modifications prior to ceramic deposition is presented. Grit blasting and polishing were used to modify the BC surface finish. Thermal barrier coating (TBC) systems were made of a commercial yttria-stabilized zirconia (YSZ) deposited by electron beam physical vapor deposition on a β-(Ni,Pt)Al-coated Ni-based single crystal superalloy. Surface roughness measurements and scanning electron microscopy observations, before and after thermal cycling at 1100 °C, were performed to investigate the influence of the initial surface treatment on the YSZ/BC interface morphology and top coat spallation resistance. Surface states enhancing TBC spallation resistance have been found. In particular, it is shown that rumpling can be avoided even in the presence of phase transformations in the BC, by grinding samples with P600 SiC paper or by applying an “heavy” grit blasting leading to a thinner BC.
本研究介绍了陶瓷沉积前粘结涂层(BC)表面改性的效果。使用喷砂和抛光来改变 BC 的表面光洁度。热障涂层(TBC)系统由商用钇稳定氧化锆(YSZ)制成,通过电子束物理气相沉积法沉积在β-(Ni,Pt)Al涂层的镍基单晶超级合金上。在 1100 °C 热循环前后进行了表面粗糙度测量和扫描电子显微镜观察,以研究初始表面处理对 YSZ/BC 界面形态和面层抗剥落性的影响。结果发现,表面状态增强了 TBC 的抗剥落性。特别是,通过使用 P600 SiC 砂纸研磨样品或使用 "重型 "喷砂使 BC 变薄,即使 BC 中存在相变,也能避免隆起。
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Pub Date : 2024-08-22DOI: 10.1007/s11085-024-10300-8
B. A. Pint, M. Romedenne, C. De Lamater-Brotherton, R. Pillai
To address the significant commercial interest in fusion energy, it will be necessary to accelerate the compatibility research associated with liquid breeders including Li, eutectic Pb–Li and LiF-BeF2 (FLiBe) molten salt. Particularly for FLiBe, compatibility understanding is limited especially for fusion relevant materials such as reduced activation ferritic-martensitic steels, SiC and V alloys. The historical knowledge associated with molten salt reactors (MSRs) and recent work to commercialize MSRs can benefit fusion research. Recent experimental and modeling work has improved understanding and this knowledge can be applied to fusion relevant materials. For liquid metals (LMs), the comparisons to Li and Pb–Li are less direct but nevertheless can help guide the pathway toward commercialization. For Pb–Li, Al-rich coatings have been shown to inhibit dissolution and potentially increase operating temperatures. For commercialization, the experience with sensors and on-line cleanup can help guide future developments. Thus, it is worth considering the potential for fission-related research with LMs and molten salts to help accelerate fusion research.
{"title":"Exploring Fission–Fusion Synergies to Accelerate Compatibility Understanding","authors":"B. A. Pint, M. Romedenne, C. De Lamater-Brotherton, R. Pillai","doi":"10.1007/s11085-024-10300-8","DOIUrl":"https://doi.org/10.1007/s11085-024-10300-8","url":null,"abstract":"<p>To address the significant commercial interest in fusion energy, it will be necessary to accelerate the compatibility research associated with liquid breeders including Li, eutectic Pb–Li and LiF-BeF<sub>2</sub> (FLiBe) molten salt. Particularly for FLiBe, compatibility understanding is limited especially for fusion relevant materials such as reduced activation ferritic-martensitic steels, SiC and V alloys. The historical knowledge associated with molten salt reactors (MSRs) and recent work to commercialize MSRs can benefit fusion research. Recent experimental and modeling work has improved understanding and this knowledge can be applied to fusion relevant materials. For liquid metals (LMs), the comparisons to Li and Pb–Li are less direct but nevertheless can help guide the pathway toward commercialization. For Pb–Li, Al-rich coatings have been shown to inhibit dissolution and potentially increase operating temperatures. For commercialization, the experience with sensors and on-line cleanup can help guide future developments. Thus, it is worth considering the potential for fission-related research with LMs and molten salts to help accelerate fusion research.</p>","PeriodicalId":724,"journal":{"name":"Oxidation of Metals","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-22DOI: 10.1007/s11085-024-10298-z
Longfei Liu, Liam F. Wood, Phalgun Nelaturu, Tianrui Duan, Chuan Zhang, Fan Zhang, Dan J. Thoma, John H. Perepezko
The oxidation of a titanium (Ti)-modified Mo-Si-B alloy designed for aerospace applications was investigated. Test samples were produced using arc melting and laser powder bed fusion (LPBF) additive manufacturing methods. To address high-temperature oxidation, a three-step coating strategy was employed, comprising a Mo precoat, Si and B co-deposition, and a conditioning step for the formation of a self-healing coating. The study evaluates the oxidation resistance of both uncoated and coated Mo-Si-B-Ti alloys at temperatures ranging from 1100 to 1300 °C. Uncoated alloys exhibited catastrophic mass loss within 10 hours at temperatures between 800 and 1300 °C. In contrast, the coated samples demonstrated minimal mass loss at 1300 °C after 50 hours, with only minor mass gain observed under cyclic thermal loading after 300 cycles. Microstructural analysis revealed distinct differences between arc-melted and LPBF samples, with the latter displaying an ultrafine dendritic microstructure. The applied coating effectively prevented oxygen diffusion into the substrate, even at elevated temperatures, showcasing its protective capabilities. During cyclic tests, the coating exhibited a self-healing mechanism, with cracks filled with borosilica contributing to prolonged environmental resistance.