Article
Materials Science, Coatings & Films
Mohadese Tabeshfar, Mehdi Salehi, Ghasem Dini, Paul Inge Dahl, Mari-Ann Einarsrud, Kjell Wiik
Summary: Gd2Zr2O7 ceramic is a potential candidate for thermal barrier coatings, and the Gd2Zr2O7 + 50 wt% YbSZ (GZO/YbSZ) coating showed the best hot corrosion resistance. Investigation of fracture toughness, phase formation, and chemical composition changes provided insights into the hot corrosion behavior of the coatings, highlighting the importance of reduced reactivity and enhanced fracture toughness for improved performance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Bowen Li, Jingyong Sun, Lei Guo
Summary: A CMAS resistant TBC of Sc doped Gd2Zr2O7/YSZ has been developed, which has a higher ability to maintain its lattice structure and coating microstructure under CMAS conditions, alleviating coating degradation.
Article
Materials Science, Coatings & Films
Damian Migas, Grzegorz Moskal, Sebastian Jucha
Summary: This study investigated the hot corrosion behavior of various Nd2Zr2O7-yttria-stabilized zirconia (YSZ) thermal barrier coatings. The results revealed that in functionally graded systems, only neodymium sulfates and chromite are formed, while in dual-phase coatings, the decomposition of pyrochlore phase generates zirconate phases with lower neodymium contents and fluorite structure.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yang Li, Yajuan She, Kai Liao
Summary: In this study, thermal barrier coatings (TBC) consisting of 3.5 mol% Yb2O3-stabilized ZrO2 co-doped with 1 mol% Gd2O3 and 1 mol% Yb2O3 were fabricated. The GdYb-YSZ TBCs showed improved corrosion resistance to V2O5 molten salt compared to YSZ TBCs. The corrosion products formed on the GdYb-YSZ TBCs included Yb, Gd-doped YVO4, and m-ZrO2.
Article
Materials Science, Ceramics
Bowen Li, Jing Wu, Xiaobin He, Bo Wang, Lei Guo
Summary: In this study, a Sc-doped Gd2Zr2O7 coating is prepared to alleviate the coupling corrosion caused by CMAS and molten salt. The results show that the GZO-Sc coating effectively prevents the attack of CN on YSZ coatings at high temperatures. The reaction between CN and the coating forms a dense reaction layer, and the presence of CaAl2Si2O8 crystals and V-rich layer in the coating improves its corrosion resistance to CN.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yong Xiang, Kai Yan, Haiyuan Yu, Yuwei Guo, Yuxi Ying, Zhenrui Li, Jian Sun, Chaogang Fang
Summary: In this study, 5.2Gd2O3-5.6Yb2O3-9.5Y2O3 co-doped ZrO2 (GdYb-YSZ) double-ceramic-layer (DCL) thermal barrier coatings (TBCs) were prepared by atmospheric plasma spraying (APS). The hot corrosion behavior and failure mechanism of the GdYb-YSZ DCL and single-layer YSZ TBCs were compared under the Na2SO4+V2O5 molten salts. The GdYb-YSZ DCL coating exhibited a better resistance to crack propagation and a significantly longer corrosion lifetime than the YSZ coating, which was attributed to the protective effect of the upper GdYb-YSZ layer.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Zhuo Chen, Xiufang Cui, Yongchao Fang, Chao Yan, Rui Wang, Yongzhi Jing, Xinhe Wang, Guo Jin, Xiang Wang
Summary: In this study, Gd2O3 and Sm2O3 co-doped LZ ceramic samples were prepared using atmospheric plasma spraying (APS). The hot corrosion behaviors of the co-doped sample were compared to mono-doped samples. Thermodynamic calculations were used to predict the corrosion mechanism. Characterization and analysis of the corrosion behavior were conducted using various techniques. The co-doped sample exhibited excellent degradation resistance, attributed to its higher entropy value.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Arezoo Sezavar, Seyed Abdolkarim Sajjadi, Abolfazl Babakhani, Ru Lin Peng, Kang Yuan
Summary: The study examined the hot corrosion behavior of conventional bilayer and compositionally graded layer TBCs in two different micro- and nanostructures. Results showed that the nanostructured bilayer TBC had 2.5 times improved hot corrosion resistance compared to the micro one, and compositionally graded layer TBCs exhibited superior corrosion resistance. Additionally, a combination of compositionally graded layer and nanostructured TBCs resulted in higher corrosion resistance.
OXIDATION OF METALS
(2021)
Article
Materials Science, Ceramics
Dianchao Liu, Yongzhi Jing, Xiufang Cui, Zhuo Chen, Xinhe Wang, Yongchao Fang, Anying Liu, Guo Jin, Erbao Liu
Summary: In this study, YbCeYSZ ceramic materials were prepared using the chemical co-precipitation method to improve the high temperature phase instability issue by adding Yb2O3. The results showed that 2.5Yb4CeYSZ material had no monoclinic phase, excellent thermal insulation performance, and molten salt corrosion resistance.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Muhammad Jahangir Khan, Grzegorz Moskal, Amjad Iqbal, Marta Mikuskiewicz, Tomasz Pawlik, Piotr Olesik
Summary: Zirconates of rare earth elements are promising materials for thermal barrier coatings. This study investigates the hot corrosion resistance of single-layered ceramic coatings composed of Gd2Zr2O7, Sm2Zr2O7, and Nd2Zr2O7. The coatings were subjected to corrosive environments created by pure magnesium sulfate (MgSO4) salt and a mixture of Na2SO4 and MgSO4. Despite the aggressive nature of the corrosive environment, the rare earth zirconates demonstrated satisfactory resistance to hot corrosion, with Sm2Zr2O7 and Nd2Zr2O7 exhibiting better corrosion resistance compared to Gd2Zr2O7.
Article
Materials Science, Coatings & Films
Kai Yan, Yong Xiang, Haiyuan Yu, Zhenrui Li, Yajing Wu, Jian Sun
Summary: The presence of irregular microcracks in yttria stabilized zirconia coatings was found to accelerate hot corrosion reaction and aggravate coating failure, but has no significant effect on the strain tolerance of the coatings.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ren-Bo Zhu, Jian-Peng Zou, Jie Mao, Zi-Qian Deng, Xiao-Feng Zhang, Chun-Ming Deng, Min Liu
Summary: In this study, spherical Gd(2)Zr(2)O(7) hollow powders were fabricated as feedstock for TBCs by spray-drying, leading to the successful fabrication of SCL and DCL Gd2Zr2O7TBCs with quasi-columnar structure by PS-PVD. Tensile and water-quenching tests demonstrated higher adhesion strength and better thermal shock resistance of DCL Gd2Zr2O7/YSZ TBCs compared to SCL Gd2Zr2O7TBCs, due to their different crack propagation mechanisms.
Article
Materials Science, Multidisciplinary
Mohamed Amer, Nicholas Curry, Qamar Hayat, Rohit Sharma, Vit Janik, Xiang Zhang, Jon Nottingham, Mingwen Bai
Summary: A new multi-layered thermal barrier coating system was developed using suspension plasma spray to improve thermal cycling performance. Cracking behavior of the coating after thermal exposure was studied, revealing different crack types and their relationship with thermal expansion mismatch and increased thermally grown oxide thickness. The reduction in bond coat hardness was linked to thermally activated grain growth. The increased hardness and elastic modulus of the ceramic layers contributed to interfacial cracks.
Article
Materials Science, Multidisciplinary
Zaoyu Shen, Zheng Liu, Ziying Huang, Rende Mu, Limin He, Guanxi Liu
Summary: Double layer ceramic (DCL) thermal barrier coatings (TBCs) have high thermal stability under high temperature, low thermal diffusivity and thermal conductivity. Advanced DCL TBCs with feathery microstructure and inter-columnar gaps exhibit good thermal shock life, but interface instabilities play a key role in their failure behaviors.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Yongang Zhang, Jiasen Han, Dongting Wu, Yong Zou
Summary: The addition of 20 wt.% Al2O3-7YSZ effectively reduces the corrosion caused by CMAS and CMAS + NaVO3 salt (CN) on TBCs, and promotes the formation of globular zirconia and interior infiltration in TBCs. This is because the dissolution of Al2O3 into the CMAS/CN melt modifies its thermophysical properties, inducing crystallization and dense layering of the anorthite interfacial reaction product.
Article
Materials Science, Ceramics
Omid Velayatipour, Leila Nikzad, Mohammad Farvizi
Summary: In this study, NiTi-x wt.%B4C (x= 0, 2, and 4) composites were prepared and the effects of boron carbide reinforcement addition on the microstructure and wear behavior were investigated. The results showed that the addition of boron carbide increased the hardness and wear resistance of the composite samples, and changed the wear mechanisms.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
M. Bahamirian
Summary: In this study, conventional yttria-stabilized zirconia (YSZ) thermal barrier coatings and nanostructured Gd2Zr2O7 (NGZO) coatings were prepared using atmospheric plasma spraying (APS) on IN738LC/CoNiCrAlY substrates. The NGZO coatings showed high resistance against CMAS particle penetration and maintained phase stability during thermal cycles.
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
A. Shamsipoor, M. Farvizi, B. Mousavi
Summary: By altering the milling time of Cr-Al-C powders, Cr2AlC samples with different purities were fabricated using the SPS method, and the impact of purity on the mechanical properties of the samples was studied. It was found that the content of Cr2AlC phase increased with increasing milling time. The flexural strength, compressive strength, and Vickers hardness decreased as the purity of Cr2AlC decreased, which can be attributed to the strengthening effect of Cr7C3. Fractographic studies revealed that the specimen with the highest purity exhibited ductile and damage tolerant behavior.
EMERGENT MATERIALS
(2023)
Article
Materials Science, Ceramics
Milad Bahamirian, Arezoo Bastani, Saeed Hasani, Mohammad Farvizi, Amir Seifoddini
Summary: The goal of this study was to investigate the impact of grain growth during heat treatment on the phase stability of AZO: A2Zr2O7 compounds at 1300 degrees C. Three cations of La3+, Gd3+, and Yb3+ were incorporated into the AZO compounds at the A-site using a co-precipitation-calcination technique. The stability of the LaZO, GdZO, and YbZO compounds was evaluated after 50 hours of heat treatment.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
M. Farvizi, M. Bahamirian, A. Faraji, H. S. Kim
Summary: By adding YSZ microparticles with a similar thermal expansion coefficient to NiTi alloy as reinforcement, the wear resistance and mismatch stress in the matrix can be improved. The use of YSZ instead of monoclinic zirconia as reinforcement reduces mismatch stress and increases the fraction of austenitic phase, leading to better shape memory and wear resistance properties.
Article
Materials Science, Multidisciplinary
Hudsa Majidian, Leila Nikzad, Sheida Hamzavi Taleghani, Mohammad Farvizi, Mansour Razavi, Arash Faraji
Summary: This study investigated the corrosion resistance of alumina-based bricks against the slag of copper alloy melting furnaces. Four commercial chrome-free alumina bricks were studied, and their properties and phase analysis were evaluated. The results showed that two bricks exhibited acceptable corrosion resistance against the slag. The presence of aluminosilicate phases improved the corrosion resistance, while large alumina aggregates restricted the penetration of slag.
MATERIALS PERFORMANCE AND CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Zahra Nasr-Esfahani, Milad Bahamirian, Mohammad Farvizi, Mohsen Nouri-Khezrabad
Summary: In this study, the effective stresses in determining the lifetime of new-generation thermal barrier coatings (TBCs) were investigated. It was found that the dual-layer YSZ/ZGdYbYO TBC exhibited better high-temperature performance compared to the single-layer ZGdYbYO TBC, with minimal variation in energy release rate. The use of an intermediate YSZ layer between the bond and top coats improved the mechanical properties and resistance to high-temperature oxidation of the TBCs.
EMERGENT MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Ahmad Keyvani, Peiman Soltani, Milad Bahamirian
Summary: This study introduces a new thermal barrier coating (CSZ: ZrO2-25 wt% CeO2-2.5 wt% Y2O3/MAC: MoSi2 + Al2O3 + CSZ) with enhanced resistance to high-temperature oxidation compared to traditional CSZ TBC.
HIGH TEMPERATURE CORROSION OF MATERIALS
(2023)
Article
Materials Science, Coatings & Films
Milad Bahamirian, Ahmad Keyvani, Reza Irankhah, Mohammad Farvizi
Summary: This study investigated the high-temperature cyclic oxidation resistance of micro- and nano-ZrO2-25wt.%CeO2-2.5wt.%Y2O3 (CYSZ) thermal barrier coatings (TBCs). The TBCs were evaluated using various characterization techniques, and the results indicated that the antiphase boundary density influenced the Young's modulus and hardness of the TBCs. Furthermore, the study showed that the nano-CYSZ TBC exhibited better oxidation resistance than the micro-CYSZ TBC at 1300 degrees C.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
M. Farvizi, M. Bahamirian, A. Faraji, H. S. Kim
Summary: This study investigated the influence of Al2O3 particle size on the performance of NiTi-based composites and found that reducing the size of reinforcement particles can improve the hardness and wear resistance of the composites.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Electrochemistry
Narjess Hajilou, Masoumeh Javaheri, Touradj Ebadzadeh, Mohammad Farvizi
Summary: The electrochemical behavior of zirconia-reinforced AlCoCrFeNi high entropy alloy was investigated in this study. The results showed that the addition of zirconia can alter the corrosion resistance of the alloy, with 5wt% addition decreasing the corrosion resistance and 10wt% addition increasing the corrosion resistance.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Article
Materials Science, Coatings & Films
Yanchun Xie, Xiaodong Wang, Shenshen Cui, Jiali Hu, Yongcun Wei, Yi Lian, Anwu Xuan, Bin Yu, Erlin Zhang
Summary: In this study, Ti-xFe (x = 3,5,9 wt%) alloys were surface modified by micro-arc oxidation (MAO) to improve their antimicrobial properties and biocompatibility. The results showed that increasing the oxidation voltage greatly enhanced the roughness and hydrophilicity of Ti-xFe-MAO alloys. The Ti-xFe alloys micro-arc oxidized at 250 V and 300 V exhibited improved corrosion resistance and excellent antimicrobial and cytocompatibility properties, making them suitable for orthopedic implant materials.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuting Hao, Zuoyan Ye, Lili Wang, Minheng Ye, Hui Dong, Chao Wang, Yunchen Du
Summary: This study focuses on the modification of PEO coatings on Ta-12W alloy using NH4F additive. The results show that ultra-low porosity coatings can be prepared by optimizing the NH4F content. The formation process of specific structures on the coating surface is discussed, and the effects of NH4F concentration and treatment duration on coating characteristics are investigated.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuanzhuo Liu, Linjiang Chai, Tao Yang, Chaodan Hu, Chuanmei Wang, Guoqiang Xi
Summary: By employing a pulsed laser, laser cladding was performed on IN718 alloy pre-coated with CrCoNi-TiC/SiC powders and three defect-free coatings were successfully prepared. The addition of TiC and SiC powders generated fine carbides dispersed in the coatings and led to changes in grain and substructure morphologies, resulting in increased hardness and wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
M. Ghaemi, A. Lopez-Cazalilla, K. Sarakinos, G. J. Rosaz, C. P. A. Carlos, S. Leith, S. Calatroni, M. Himmerlich, F. Djurabekova
Summary: The use of high-power impulse magnetron sputtering can result in dense and uniform niobium films on all surfaces of superconducting rf cavities, as simulated and investigated in this study.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Jiaheng Du, Xinli Fan, Dongqin Xiao, Wuxiang Wang, Yiran Yin, Zhong Li, Kui He, Yanfei Tan, Jiyuan Yan, Gangli Liu, Ke Duan
Summary: This study investigated the electrophoretic deposition (EPD) of magnesium oxide (MgO) coatings on micro-arc oxidized titanium (MAO-Ti) and evaluated their in vitro antibacterial properties and biocompatibility. The results showed that MgO coatings significantly reduced bacterial numbers and biofilm formation, while also demonstrating good cytocompatibility and induction of osteoblast mineralization.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Samiksha Moharana, Yuichi Otsuka, R. Gnanamoorthy
Summary: The addition of titania to HAp coatings improves their wear resistance and reduces damage to titanium implants caused by debris generation. This study evaluates the fretting wear resistance of titania-added HAp suspension plasma spray coating and finds that it exhibits reduced friction coefficient and increased wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Li-Ping Wu
Summary: The functional hazenite coating deposited on AZ31 Mg alloy showed improved roughness and hydrophilicity, enhanced biocompatibility, reduced degradation rate, and decreased susceptibility to stress corrosion cracking.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Ning Tian, Delei Xu, Jinfei Wei, Bucheng Li, Junping Zhang
Summary: This study reports the preparation of a superhydrophobic and anti-bacterial fabric for face masks. The fabric exhibits high superhydrophobicity and excellent moisture resistance, enabling functionality effectiveness in cold weather conditions. The fabric also demonstrates remarkable anti-bacterial activity against E. coli, attributed to the synergistic effect of superhydrophobicity and embedded ZnO nanoparticles. This superhydrophobic anti-bacterial fabric holds great potential for various practical applications in personal protective equipment, healthcare, and disease prevention.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Katharina Beck, Anke S. Ulrich, Andreas K. Czerny, Emma M. H. White, Martin Heilmaier, Mathias C. Galetz
Summary: Refractory metal based alloys have great potential as structural materials for high-temperature applications due to their high melting points. However, they are prone to catastrophic oxidation at around 700 degrees C. This study investigated the effect of aluminium diffusion coatings on the oxidation resistance of pure molybdenum, niobium, tantalum, and tungsten. The results showed that the aluminization improved the oxidation behavior and decreased the oxide growth rate for molybdenum and tantalum.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Wenwen Shuai, Haijun Dou, Zhichen Guan, Wei Qian, Zhibao Li, Yinqun Hua, Jie Cai
Summary: This study synthesized (Y1-xLax)3Al5O12 (x = 0, 0.1, 0.2, 0.3) materials by doping lanthanum ions, and found that the doped materials exhibited improved mechanical properties and thermal expansion coefficient, as well as enhanced resistance to CMAS corrosion. These materials have potential applications.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Xianglei Liu, Jiahui Ding, Wanbo Hou, Xinhao Shi, Tao Feng, Xiangyuan Meng, Shifeng Wen, Mingde Tong, Zhufeng Yue
Summary: A composite coating was developed to improve the adhesion, wear resistance, and corrosion resistance, which exhibited significant enhancements in these properties.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hongxuan Xing, Jidong Li, Xianwei Hu, Liang Tian, Renyun Zhang, Yiyong Wang
Summary: By depositing a Cu/Co-Mo corrosion-resistant plating layer on the surface of 6061 Al alloy, the bonding strength between the alloy and the plating layer can be improved and the corrosion resistance can be enhanced. The composite coating forms an obvious three-layer structure with Co-Mo coating exhibiting amorphous characteristics and Co3Mo phase composition. The composite coating improves the corrosion resistance and hardness of the substrate, effectively protecting the 6061 Al alloy.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Fan Yang, Debin Wang, Tianrun Li, Baijun Yang, Suode Zhang, Jianqiang Wang
Summary: The impact-corrosion behavior of monolayer and hierarchical Fe-based amorphous coatings fabricated by HVAF was investigated in 3.5 wt% NaCl solution. The monolayer coating exhibits corrosion failure with increased impact energy, while the hierarchical coating shows improved resistance. However, at high impact energies, both coatings experience corrosion degradation.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Shoaib Ahmad, Muddasir Nawaz, Solaiman Mohammad, R. A. Shakoor, Ramazan Kahraman, Talal Mohammed Al Tahtamouni
Summary: This research presents a novel self-healing anti-corrosion composite coating that demonstrates higher inhibition efficiency and self-healing effect, providing protection for metallic structures against corrosive environments.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hui-Wen Peng, Chun-Hway Hsueh
Summary: A series of (CoCrNi)100-x-ySixNdy medium entropy alloy films with manipulated metalloid element, Si, and rare earth element, Nd, were synthesized using magnetron three-target co-sputtering. The films showed different structures and mechanical properties with varying Si and Nd contents. The optimized mechanical properties were observed in the film with Si0.61Nd5.14, attributed to precipitation strengthening and grain refinement.
SURFACE & COATINGS TECHNOLOGY
(2024)
