Surface & Coatings Technology最新文献_第3页

The effect of the precursors and chemical vapor deposition process on the synthesis of two-dimensional molybdenum nitride nanomaterials

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-21 DOI: 10.1016/j.surfcoat.2024.131577

Sheng-Kuei Chiu , Bo-Cyuan Lin , Lu-Chih Chen , Hau-Gung Chen , Cheng-Chi Peng , Zhi-Chao Yang

Researchers have extensively investigated 2D nanomaterials of TMN owing to its superior chemical and physical characteristics and numerous potential uses. Research on the synthesis of TMNs was insufficient and remained stagnant. Here, we alter precursor types and substrates and develop three CVD procedures for synthesizing TMN. High-quality signal-crystal MoN nanoflakes were synthesized using sodium molybdate precursors. The same growth conditions directly induced the formation of Mo₅N₆ nanofilms on sapphire substrate. We synthesized large-area MoN nanofilms on silicon substrates by conducting a nitrogen substitution reaction on MoS₂ nanofilms. MoS₂ serves as the precursor for MoN nanofilms synthesis via nitridation. MoN's characteristic peak at 143.34 cm⁻¹ was located using Raman spectroscopy. We obtained epitaxial growth of Mo₅N₆ nanofilms at low pressure (66 cm Hg) on a sapphire substrate. Mo₅N₆ nanofilms exhibited a distinctive Raman spectroscopy signal at 154.03 cm⁻¹. In anticipation of its prospective applications, we assessed the electrical properties of Mo₅N₆ nanofilms. Additionally, the resistivity of Mo₅N₆ was found to be 1.555*10⁻⁵ Ωcm. Large-area 2D nanomaterials, such as Mo₅N₆, have the potential to be employed as graphene or other semimetal materials in the electronic device industry, as evidenced by the temperature dependency of the conductivity test.

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引用次数: 0

CVD-grown SiC nanowires-reinforced SiC coating on C/C composites: Focusing on antioxidation, thermal shock and high-temperature gas erosion resistance 碳/碳复合材料上的 CVD 生长碳化硅纳米线增强碳化硅涂层：关注抗氧化性、抗热震性和抗高温气体侵蚀性

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-20 DOI: 10.1016/j.surfcoat.2024.131584

Xinfa Qiang , Maoheng Dong , Xiangyu Chen , Zi Yang , Hengxiang Zhai , Chao Wu , Song Tian

To improve the oxidation resistance of C/C composites, a SiCNWs-reinforced SiC (SiCNWs-SiC) coating was successfully fabricated in-situ by a simple chemical vapor deposition (CVD) process on C/C composites. Microstructural analysis revealed uniform β-SiCNWs with diameters of 50–200 nm and lengths up to tens of micrometers. The thickness of porous SiCNWs layer is approximately 300 μm. Elevated deposition temperatures deteriorated coating density, with optimal performance at 1373 K. The SiCNWs enhanced deposition efficiency, boosting bending strength from 107.2 MPa to 134.3 MPa and adhesion strength from 6.74 MPa to 14.18 MPa. Oxidation resistance tests at various temperatures confirmed superior performance of SiCNWs-toughened SiC coatings. Thermal shock tests showed minimal weight loss (2.5 %) after 30 cycles, outperforming pure SiC coatings (6.2 %). The 1873 K gas erosion test showed that the weight loss of the SiCNWs-SiC coated C/C samples was only 5.2 % for 53 h, while the pure CVD-SiC coated C/C composite samples broke after 19 h of gas erosion, and the weight loss of pure C/C composite samples reached as high as 38.5 % after 1.3 h of gas erosion.

为了提高碳/碳复合材料的抗氧化性，通过简单的化学气相沉积（CVD）工艺在碳/碳复合材料上成功地原位制备出了 SiCNWs 增强碳化硅（SiCNWs-SiC）涂层。微观结构分析表明，β-SiCNWs 的直径在 50-200 纳米之间，长度可达数十微米。多孔 SiCNWs 层的厚度约为 300 微米。SiCNWs 提高了沉积效率，使弯曲强度从 107.2 兆帕提高到 134.3 兆帕，附着强度从 6.74 兆帕提高到 14.18 兆帕。在不同温度下进行的抗氧化测试表明，SiCNWs 增韧的碳化硅涂层性能优越。热冲击测试表明，经过 30 次循环后，涂层的重量损失极小（2.5%），优于纯碳化硅涂层（6.2%）。1873 K 气体侵蚀测试表明，SiCNWs-SiC 涂层 C/C 样品在 53 小时内的失重率仅为 5.2%，而纯 CVD-SiC 涂层 C/C 复合材料样品在 19 小时气体侵蚀后就会破裂，纯 C/C 复合材料样品在 1.3 小时气体侵蚀后的失重率高达 38.5%。

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引用次数: 0

Epitaxial growth of TiZrNbTaN films without external heating by high-power impulse magnetron sputtering 利用大功率脉冲磁控溅射技术在无外部加热的情况下外延生长 TiZrNbTaN 薄膜

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-20 DOI: 10.1016/j.surfcoat.2024.131583

Sanath Kumar Honnali , Robert Boyd , Roger Magnusson , Arnaud le Febvrier , Daniel Lundin , Grzegorz Greczynski , Per Eklund

In this work, we demonstrate epitaxial growth of multiprincipal-element alloy TiZrNbTa nitride thin films at substrate temperature below 50 °C. They were deposited on c-plane sapphire substrates by reactive high-power impulse magnetron sputtering (HiPIMS) without external heating. Reference layers were also grown by direct current magnetron sputtering (DCMS) at 400 °C as well as without external heating on the same type of substrates. X-ray diffraction and transmission electron microscopy analysis showed single phase films, with the HiPIMS films having a reduced mosaicity along both in-plane and out-of-plane orientations as compared to the DCMS layers grown at 400 °C. The optical and electrical properties determined by spectroscopic ellipsometry and room-temperature four-point probe measurements showed that the HiPIMS films exhibit higher absorbance in the near-infrared wavelength and higher electrical resistivity than the DCMS films deposited at 400 °C. Furthermore, ion-beam analysis of the HiPIMS grown films revealed nitrogen-to-metal ratio close to unity. This study shows that epitaxial film growth of multiprincipal-element nitrides can be realized without the need of intentional substrate heating provided that the growing film surface is irradiated by metal ions. This reduces the total process energy consumption by ~50 % (as compared to DCMS film at 400 °C) with the added benefit of possibility to grow film on temperature-sensitive substrates.

在这项研究中，我们展示了多元素合金氮化钛（TiZrNbTa）薄膜在低于 50 ℃ 的基底温度下的外延生长。这些薄膜通过反应式高功率脉冲磁控溅射（HiPIMS）沉积在 c 平面蓝宝石基底上，无需外部加热。参考层也是通过直流磁控溅射（DCMS）法在 400 ° C 的温度下生长出来的。X 射线衍射和透射电子显微镜分析表明，HiPIMS 薄膜为单相薄膜，与 400 ℃ 生长的 DCMS 层相比，HiPIMS 薄膜在面内和面外方向上的镶嵌度都有所降低。光谱椭偏仪和室温四点探针测量法测定的光学和电学特性表明，与 400 ℃ 下沉积的 DCMS 薄膜相比，HiPIMS 薄膜在近红外波段的吸光度更高，电阻率也更高。此外，对 HiPIMS 生长的薄膜进行的离子束分析表明，氮金属比接近于一。这项研究表明，只要生长的薄膜表面受到金属离子的照射，就可以实现多主元素氮化物的外延薄膜生长，而无需刻意加热基底。这将工艺总能耗降低了约 50%（与 400 °C 下的 DCMS 薄膜相比），而且还能在对温度敏感的基底上生长薄膜。

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引用次数: 0

Formation mechanism and oxidation performance for a novel Mo(Si,Al)2 coating prepared using a modified pack cementation strategy

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-19 DOI: 10.1016/j.surfcoat.2024.131574

Chong Zhang, Jinchao Yang, Rui Lin, Chao Shen, Lian Zuo, Zhiyu Hu, Chuming He

Using a modified Si-Al deposition strategy in the process of halide-activated pack cementation, conventional and novel Mo(Si,Al)₂ coatings are fabricated on molybdenum substrate to assess their distinct formation mechanism and oxidation performance. The results show that the conventional coatings are composed of an inner layer containing pure C11b MoSi₂ and an outer layer containing C11b MoSi₂ with a little Al. By contrast, the new coating is composed of pure C22 Al₈Mo₃ as the inner layer and C40 Mo(Si,Al)₂ as the outer layer (unexpectedly low Al percentage of 13 at.%). Notably, the two kinds of coatings have different microstructures and formation characteristics. The former's synthesis pathway includes the sequential formation of C22 Al₈Mo₃, C40 Mo(Si,Al)₂, and C11b MoSi₂, accompanied by a reduction in the proportion of solidified Al in Mo(Si,Al)₂. The latter's synthesis path includes the transformation from C11b MoSi₂ to C40 Mo(Si,Al)₂, and the Al content is always maintained at the highest level with the coating growth. Meanwhile, the phase transition between Al₈Mo₃ and Mo(Si,Al)₂ is an irreversible process and neither coating forms the C54 structure of Mo(Si,Al)₂ due to the low temperature. Besides, the different oxidation mechanisms are elucidated on basic of the two deposition procedures and corresponding to oxidation performance. Hence, the newly developed Mo(Si,Al)₂ coating of first silicon and then aluminum in the process of pack-cementation can be effectively used to fabricate a protective α-Al₂O₃ barrier layer at a temperature of 1300 °C.

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引用次数: 0

Mechanical and tribology performance of nanostructured ZrN-Cu coatings obtained by hybrid HiPIMS-DCMS technology 利用 HiPIMS-DCMS 混合技术获得的纳米结构 ZrN-Cu 涂层的机械和摩擦学性能

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-19 DOI: 10.1016/j.surfcoat.2024.131579

J.D. Castro , J.C. Sánchez-López , S. Carvalho

One of the biggest players in the world economy is the naval industry, which mainly controls the merchandise transportation sector. Any issue with ships could represent millions of USD of loss and increases in the cost of goods for the population worldwide. Two main problems which this industry has fought are corrosion and biofouling. Lastly, the pollution of the sea has gained importance, and more strict policies have been applied regarding the use of certain products by this industry. One of these is paintings, which represented this industry's definitive solution to avoid the mentioned problems for a long time. This situation allowed to explore other solutions like PVD coatings through multifunctional coatings. Zirconium nitride has been demonstrated to be useful in resisting corrosion with reliable mechanical properties. However, this material does not possess antimicrobial action. The present study presents a nanostructured coating combining ZrN with Cu, which works as a biocide, contributing to the desired multifunctionality. The developed coating was obtained using a hybrid magnetron co-sputtering employing High-power impulse (HiPIMS) and direct current (DCMS) power sources under a reactive atmosphere. SEM, EDX, XRD and Raman spectroscopy were used to assess the physico-chemical properties of the coatings. Besides, depth-sensing nano-indentation explored the mechanical properties. The tribological performance was tested by a reciprocating tribometer under dry and wet (with 3.5 % w/w NaCl solution) contact conditions and employing a soda lime glass ball as a counterbody. The results showed that adding Cu to ZrN through this technology resulted in a limited hardness reduction from 19 (pure ZrN) to 14 GPa. Also, the chemical activation with NaOCl solution softens the obtained coating and, together with the saline solution, influences the wear resistance. However, the nanostructured coating has been demonstrated to be suitable for use under real conditions, without loss of its protection over the used substrate. It opens a new possibility of a solution for the naval industry.

海运业是世界经济中最大的参与者之一，它主要控制着商品运输部门。船舶的任何问题都可能造成数百万美元的损失，并增加全球人口的商品成本。该行业面临的两大问题是腐蚀和生物污损。最后，海洋污染问题日益受到重视，该行业对某些产品的使用采取了更加严格的政策。涂料就是其中之一，它是该行业长期以来避免上述问题的最终解决方案。在这种情况下，人们开始探索其他解决方案，如通过多功能涂层进行 PVD 涂层。氮化锆已被证明在抗腐蚀方面具有可靠的机械性能。然而，这种材料并不具有抗菌作用。本研究提出了一种结合了氮化锆和铜的纳米结构涂层，铜具有杀菌作用，有助于实现所需的多功能性。所开发的涂层采用混合磁控共溅射技术，在反应气氛下使用大功率脉冲（HiPIMS）和直流（DCMS）电源。扫描电子显微镜（SEM）、电子衍射X射线（EDX）、X射线衍射（XRD）和拉曼光谱用于评估涂层的物理化学特性。此外，深度感应纳米压痕测试也对机械性能进行了检测。在干湿（含 3.5 % w/w NaCl 溶液）接触条件下，使用往复式摩擦磨损仪测试了涂层的摩擦学性能，并使用钠钙玻璃球作为反体。结果表明，通过这种技术在氮化锆中添加铜后，硬度从 19（纯氮化锆）降低到 14 GPa，但降低幅度有限。此外，用 NaOCl 溶液进行化学活化会软化所获得的涂层，并与生理盐水一起影响耐磨性。不过，纳米结构涂层已被证明适合在实际条件下使用，而且不会失去对所用基材的保护作用。这为海军工业提供了一种新的解决方案。

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引用次数: 0

On the reactive wetting of Fe-Mn-Sb alloys during continuous hot-dip galvanizing 连续热浸镀锌过程中 Fe-Mn-Sb 合金的反应润湿问题

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-19 DOI: 10.1016/j.surfcoat.2024.131576

Bita Pourbahari, Joseph R. McDermid

The effect of a Sb micro addition on the reactive wetting of Fe-(2−10)Mn-(0.00/0.03)Sb (at. pct) by a Zn(Al,Fe) galvanizing bath was determined. Despite the presence of surface oxides prior to immersion, an integral zinc coating was obtained on all Fe-Mn-Sb steel substrates. It was found that Sb segregation at the external oxide/substrate interface resulted in a decrease in the size of the external oxide particles, which facilitated contact between the Zn bath and the substrate. Moreover, it was determined the size of the closely packed FeAl intermetallics at the coating/steel interface increased as a result of adding Sb to the steel, which was attributed to the finer and thinner external oxide particles formed on the surface of these steel prior to dipping and lower stability of the oxide/substrate interface, which allowed for facilitating the advancement of reactive wetting occurred through mechanisms such as the aluminothermic reduction of MnO, oxide bridging, and oxide lift-off. In addition, a mechanism for the efficacy of Sb as a surface-active element during the continuous galvanizing process was determined. The analysis revealed that the segregated Sb dissolved into the liquid Zn and disrupted the oxide bond with the substrate. This can be attributed to Sb higher electronegativity with Zn compared to Fe and its sufficient solubility in liquid Zn at 460 °C. After the formation of the desired interfacial layer, no Sb segregation was observed at the interface between the interfacial layer and the substrate. These results highlight the considerable advantages of applying a Sb micro-addition for enhancing the reactive wetting of AHSSs with higher Mn contents in the continuous galvanizing process.

研究确定了微量添加锑对 Zn（Al,Fe）镀锌浴对 Fe-(2-10)Mn-(0.00/0.03)Sb（at. pct）反应润湿的影响。尽管在浸泡之前存在表面氧化物，但在所有的铁-锰-锑钢基板上都获得了完整的锌镀层。研究发现，外部氧化物/基底界面上的锑偏析导致外部氧化物颗粒尺寸减小，从而促进了锌镀液与基底之间的接触。此外，在钢中添加锑后，涂层/钢界面上紧密排列的铁铝金属间化合物的尺寸增大，这是因为在浸渍前这些钢的表面形成了更细更薄的外部氧化物颗粒，氧化物/基体界面的稳定性降低，从而通过氧化锰的铝热还原、氧化物架桥和氧化物脱落等机制促进了反应润湿。此外，还确定了锑作为表面活性元素在连续镀锌过程中的作用机制。分析表明，偏析的锑溶解到液态锌中，破坏了与基材的氧化物结合。这可能是由于锑与锌的电负性比与铁的电负性高，而且在 460 ℃ 时锑在液态锌中有足够的溶解度。在形成所需的界面层后，在界面层和基底之间的界面上没有观察到锑偏析现象。这些结果凸显了在连续镀锌工艺中应用锑微添加剂来提高锰含量较高的 AHSS 反应润湿性的巨大优势。

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引用次数: 0

Graphene-reinforced titanium coatings deposited by Cold Gas Spray: Study of microstructure, mechanical and wear properties 冷气体喷雾法沉积的石墨烯增强钛涂层：微观结构、机械和磨损性能研究

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-19 DOI: 10.1016/j.surfcoat.2024.131555

Edwin Torres Díaz , Alessio Silvello , Edwin Rua Ramirez , Rafael Molero Campos , Antonio Paton Carrero , Rodolpho Fernando Vaz , Irene García Cano

This study integrates graphene-based nanostructures as reinforcement in a Ti matrix to produce coatings using the Cold Gas Spray (CGS) technique, aiming to enhance mechanical and tribological properties while overcoming some of the limitations of conventional thermal spray methods. The hypothesis holds that incorporating Carbon Nanofibers (GFs) into Ti matrices significantly reinforces these properties compared to pure Ti coatings. The study employed ball milling for the powders obtaining, CGS deposition, and various analytical tests to evaluate the performance of Ti-GFs and pure Ti coatings. Results revealed that Ti-GFs coatings significantly improved in mechanical properties, achieving ultimate tensile strength up to 456 MPa and a strain increase to 2.27%. These improvements are attributed to effective load transfer across the Ti-GFs interfaces, facilitated by strong chemisorption interactions. Additionally, heat treatments at 1000 °C relieved residual stresses and promoted microstructural changes via atomic diffusion, further contributing to the coatings’ strength and ductility. Tribological assessments revealed a 21% reduction in the coefficient of friction for Ti-GFs coatings compared to as-sprayed Ti, though was 2% higher than that of Ti-Bulk. This suggests the potential of graphene as a nanoscale lubricant, though further optimization of GFs dispersion and interface interactions may result in even lower coefficient.

These findings highlight the potential of GFs reinforced metal matrix composites applied by CGS for critical applications in sectors such as aerospace and biomedical, which demand materials with high strength and reduced mechanical wear. The study also identifies key areas for future research, including the optimization of graphene dispersion and interface bonding, to fully exploit the benefits of GFs in CGS coatings.

本研究将石墨烯基纳米结构作为增强材料集成到钛基体中，利用冷气体喷雾（CGS）技术生产涂层，旨在提高机械和摩擦学性能，同时克服传统热喷涂方法的一些局限性。假设认为，与纯钛涂层相比，在钛基体中加入纳米碳纤维（GF）可显著增强这些性能。研究采用球磨法获得粉末、CGS 沉积和各种分析测试来评估 Ti-GFs 和纯 Ti 涂层的性能。结果表明，Ti-GFs 涂层的机械性能明显改善，极限拉伸强度达到 456 兆帕，应变增加到 2.27%。这些改善归功于 Ti-GFs 界面上有效的载荷传递，而强大的化学吸附作用又促进了载荷传递。此外，1000 °C的热处理缓解了残余应力，并通过原子扩散促进了微结构变化，进一步提高了涂层的强度和延展性。摩擦学评估显示，与喷涂钛相比，Ti-GFs 涂层的摩擦系数降低了 21%，但比普通钛高出 2%。这些发现凸显了石墨烯增强金属基复合材料在 CGS 应用于航空航天和生物医学等领域关键应用的潜力，这些领域需要高强度和减少机械磨损的材料。研究还确定了未来研究的关键领域，包括优化石墨烯分散和界面结合，以充分发挥 GFs 在 CGS 涂层中的优势。

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引用次数: 0

Influence of cooling rate on microstructure, dislocation density, and associated hardness of laser direct energy deposited Inconel 718 冷却速度对激光直接能量沉积 Inconel 718 的微观结构、位错密度和相关硬度的影响

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-19 DOI: 10.1016/j.surfcoat.2024.131575

Manik A. Patil , Tina Ghara , Biswajit Das , Dhananjay M. Kulkarni

This work deals with the effect of cooling rate on microstructure, dislocation density, and microhardness of laser direct energy deposited Inconel 718. Thermocycles were captured during direct energy deposition process using an infrared pyrometer. Cooling rate was estimated from the thermocycles at various laser powers and scanning speeds. In addition, a numerical model was developed to calculate cooling rate at different laser process parameters, and the same was verified with the experimental results. Microstructure and phases of the direct energy deposited Inconel 718 were observed using a scanning electron microscope and X-ray diffractometer, respectively. Top layer of the cladding was found to consist of fine equiaxed grains, whereas columnar dendrites were observed at the interface region of cladding layer and substrate. This is attributed to the variation in cooling rates between the top layer of the cladding and the interface region. γ, γ′, γ″ and Laves phases were identified to be the primary phases in the cladding layer. Moreover, niobium content was found to be high and varying with the cooling rate in the direct energy deposited Inconel 718. Dislocation density at varying scanning speed, i.e., cooling rate was estimated using the Williamson-Hall method. An increase in the dislocation density and concomitant improvement in the hardness was found with an increase in the cooling rate.

本研究涉及冷却速率对激光直接能量沉积 Inconel 718 的微观结构、位错密度和显微硬度的影响。在直接能量沉积过程中，使用红外测温仪捕捉热循环。根据不同激光功率和扫描速度下的热循环估算冷却率。此外，还开发了一个数值模型来计算不同激光工艺参数下的冷却率，并与实验结果进行了验证。使用扫描电子显微镜和 X 射线衍射仪分别观察了直接能量沉积 Inconel 718 的微观结构和相位。发现包层顶层由细小的等轴晶粒组成，而在包层和基体的界面区域则观察到柱状树枝状晶粒。这归因于覆层顶层和界面区域之间冷却速率的变化。经鉴定，γ、γ′、γ″ 和 Laves 相是包层中的主要相。此外，还发现在直接能量沉积的 Inconel 718 中，铌的含量很高，且随冷却速度的变化而变化。使用 Williamson-Hall 方法估算了不同扫描速度（即冷却速度）下的位错密度。随着冷却速度的增加，位错密度也随之增加，硬度也随之提高。

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引用次数: 0

On controlling microstructure of suspension plasma sprayed yttria-stabilized zirconia topcoat on β-(Ni,Pt)Al bondcoat 关于控制β-(Ni,Pt)Al 结合层上悬浮等离子喷涂钇稳定氧化锆面层的微观结构

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-17 DOI: 10.1016/j.surfcoat.2024.131572

D. Huang , Y.S. Niu , S. Li , Y.M. Jiang , C.Y. Zhang , Z.B. Bao , S.L. Zhu , F.H. Wang

The deposition of tetragonal yttria-stabilized zirconia on β-(Ni,Pt)Al bondcoat was successfully achieved using suspension plasma spraying, resulting in various structures including columnar and vertical-cracked formations. This study aims to investigate the deposition mechanism of suspension plasma sprayed topcoats on β-(Ni,Pt)Al bondcoat by adjusting suspension characteristics and spraying distances. The results demonstrated that increasing ethanol contents gradually transitioned the structure from vertical-cracked to columnar. Moreover, the spraying distance effectively controlled the deposition rates, surface roughness, and porosity of the deposited topcoats. Additionally, both columnar and equiaxed crystals were uniformly distributed within the deposited topcoats, with a comprehensive discussion on their formation mechanisms.

采用悬浮等离子喷涂技术成功地在β-(Ni,Pt)Al结合层上沉积了四方钇稳定氧化锆，形成了柱状和垂直裂纹等多种结构。本研究旨在通过调整悬浮液特性和喷涂距离，研究悬浮等离子喷涂面漆在β-(Ni,Pt)铝键合层上的沉积机理。结果表明，乙醇含量的增加会使结构从垂直裂纹逐渐过渡到柱状。此外，喷涂距离能有效控制沉积面漆的沉积速率、表面粗糙度和孔隙率。此外，柱状和等轴状晶体在沉积表层涂料中均匀分布，并对其形成机制进行了全面讨论。

引用次数: 0

Evaluation of AlCoCrFeNiTi-high entropy alloy (HEA) as top coat material in thermal barrier coating (TBC) system and investigation of its high temperature oxidation behavior 铝钴铬铁镍钛高熵合金 (HEA) 作为热障涂层 (TBC) 系统面层材料的评估及其高温氧化行为研究

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-11-17 DOI: 10.1016/j.surfcoat.2024.131569

Okan Odabas , Abdullah Cahit Karaoglanli , Yasin Ozgurluk , Gulfem Binal , Dervis Ozkan

To obtain compatible properties of high-temperature performance and mechanical strength properties, AlCoCrFeNiTi high-entropy alloy (HEA) was designed as a new candidate material for metal-based thermal barrier coating (TBC) systems. The aim of this study is to investigate potential applications of AlCoCrFeNiTi-HEA as a coating material for TBC systems and to determine its behavior under high temperature conditions. CoNiCrAlY bond coatings were produced on the Inconel-718 substrate surface using high-velocity oxygen fuel (HVOF) technique. AlCoCrFeNiTi-HEAs were produced on CoNiCrAlY bond coatings using atmospheric plasma spray (APS) technique and a typical TBC system structure was obtained. The produced AlCoCrFeNiTi-HEA TBC system was exposed to oxidation at temperatures of 1000 °C and 1100 °C for time periods of 5 h, 25 h, 50 h and 100 h in order to determine the oxidation resistance under isothermal conditions and to investigate formation and growth behavior of oxide structures formed at the coating interface. As a result of oxidation tests, the growth behavior of the thermally grown oxide (TGO) layer formed between the coating interfaces and the microstructural changes occurring in the coating system were investigated depending on temperature and time processes. In the TBC system with Ti-containing HEA content, a transformation from body-centered cubic (BCC) structure to rhombohedral crystal lattice structure occurred as a result of increasing temperature. Many spinel compound forms were formed at the coating interface. It was observed that the coating system with AlCoCrFeNiTi-HEA content maintained its structural integrity without any damage such as microstructural and mechanical spalling and cracking under conditions of high temperature and different time periods.

为了获得高温性能和机械强度性能的兼容特性，人们设计了铝钴铬铁镍钛高熵合金（HEA），作为金属基热障涂层（TBC）系统的新候选材料。本研究旨在调查铝钴铬铁镍钛高熵合金作为 TBC 系统涂层材料的潜在应用，并确定其在高温条件下的行为。采用高速氧气燃料（HVOF）技术在 Inconel-718 基体表面生产了 CoNiCrAlY 键涂层。使用大气等离子喷涂（APS）技术在 CoNiCrAlY 键涂层上生成了 AlCoCrFeNiTi-HEAs 并获得了典型的 TBC 系统结构。为了确定等温条件下的抗氧化性，并研究涂层界面上形成的氧化物结构的形成和生长行为，将制得的铝钴铬铁镍钛-氢氧化物 TBC 系统暴露在 1000 ℃ 和 1100 ℃ 的温度下进行了 5 小时、25 小时、50 小时和 100 小时的氧化试验。根据氧化试验的结果，研究了涂层界面之间形成的热生长氧化物（TGO）层的生长行为以及涂层体系中发生的微观结构变化（取决于温度和时间过程）。在含钛 HEA 的 TBC 系统中，随着温度的升高，发生了从体心立方（BCC）结构到斜方晶格结构的转变。在涂层界面上形成了许多尖晶石化合物形态。据观察，含 AlCoCrFeNiTi-HEA 的涂层体系在高温和不同时间段的条件下保持了结构的完整性，没有出现任何损坏，如微观结构和机械剥落和开裂。

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引用次数: 0