Article
Materials Science, Coatings & Films
Haoqiang Zhang, Haiqing Li, Guidi Chen, Jianxing Su, Min Wei, Cunqiang Ma, Jingsheng Bai, Qimin Wang
Summary: Poor oxidative performance limits the applications of refractory alloys due to the non-protective nature of their oxide scales. B-modified MoSi2 coating is a widely investigated protective coating system for refractory alloys developed in recent decades. To further modify the oxidation resistance of Mo-Si-B coatings, Mo-W-Si-B coatings are synthesized in situ on the surfaces of Mo-20W alloy substrates using a halide-activated pack-cemented Si-B co-deposition process, and their isothermal oxidation behavior at 1200 and 1650 degrees C in static air is investigated. The results indicate that the Mo-W-Si-B coatings have better oxidation resistance than Mo-Si-B coatings at both temperatures. Fewer mass changes of -4.36 and -0.39 mg/cm2 were obtained by the Mo-W-Si-B coatings at 1200 degrees C for 1000 h and 1650 degrees C for 4 h, respectively. The oxidation process of the Mo-W-Si-B coatings was elaborated on, and the improved performance was attributed to the slower Si consumption and better stability of the borosilicate scale in the Mo-W-Si-B coatings.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
T. Koenig, M. C. Galetz, B. Albert
Summary: The potential and limitations of a halide-activated pack cementation process for the development of bond coats on SiC/SiC Ceramic Matrix Composites were investigated. A two-step pack cementation process using chromium and aluminum was proposed to achieve an alumina-forming coating, which protected the fiber-matrix interface from oxidation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Won June Choi, Hojun Lee, Chun Woong Park, Young Do Kim, Jongmin Byun
Summary: In this study, the high temperature oxidation behavior of molybdenum borides was investigated through pack cementation process. The results showed that molybdenum borides with pack cementation process exhibited improved oxidation resistance due to the formation of a silicide layer and borosilicate layer on the surface.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Chemistry, Physical
Guoming Yi, Yi Ding, Yanhai Cheng, Ping Zhang, Xin Wang, Xiubing Liang
Summary: A novel high entropy silicide (NbMoTaWV)Si-2 coating was prepared on a NbMoTaWV high entropy alloy by silicon pack cementation. The coating exhibited a single-phase or dual-phase structure depending on the processing parameters. The coating showed improved oxidation resistance at high temperatures but was prone to failure at corners.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Lina Zhang, Yuebo Zhou
Summary: A Si-modified aluminide coating was prepared on nickel-based K438 superalloy using a hybrid slurry/pack cementation process. The coatings exhibited a two-layer structure, with an outer Al-rich Ni0.9Al1.1 layer and an inner interdiffusion layer. Compared to simple aluminide coatings, the Si-modified aluminide coatings showed lower oxidation rate and improved alumina scale adhesion at 1,100 degrees C. Additionally, the Si-modified aluminide coatings had longer service life due to the addition of Si, while the simple aluminide coatings lost protection after 300 hours.
Article
Materials Science, Ceramics
Ruixiong Zhai, Peng Song, Taihong Huang, Chao Li, Chen Hua, Wenlang Huang, Qing Li, Biju Zheng, Jiansheng Lu
Summary: Using a two-step pack cementation method, double layers of MoSi2-MoB were applied on the surface of a Mo substrate to enhance its oxidation resistance at high temperatures. The formation of a dense and continuous SiO2 layer with low O-2 permeability contributed to the excellent high-temperature oxidation resistance of the double layers.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Yangyang Liu, Qiang Miao, Wenping Liang, Hao Lin, Hanchun Ma, Weiwei Shi, Xiao Xu
Summary: The study revealed the competitive effects of Al2O3 in SiC coatings, enhancing coating quality while also affecting oxidation behavior. Al2O3 can improve coating quality and resistance to oxidation, but also plays multiple roles in the transition of oxidative mechanisms.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Jianyong Yang, Hua Liu, Wen Gao, Linfen Su, Kaiyong Jiang
Summary: Mo-Si-B coatings were prepared on molybdenum using pack cementation process with different fillers affecting microstructural evolution and high temperature oxidation kinetics. The coatings consisted of MoSi2 layer and MoB transitional layer, while oxidation resulted in three-layer structure of SiO2 film, Mo5Si3 layer, and MoSi2 layer. SiO2 filler reduced weight gain and consumption of MoSi2 layer during oxidation.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Peng Wang, Daoqian Li, Jiawei Meng, Chuncheng Wei, Shuang Li, Xin Geng, Haibin Sun, Xiaowei Li, Yun Wu, Guangwu Wen
Summary: The silicon/graphite ratio and temperature have been investigated for their effects on the preparation and properties of ZrB2-SiC coatings. A higher silicon/graphite ratio does not guarantee higher coating density, but residual silicon in the coating is beneficial for increased density and enhanced oxidation protection ability.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Zefei Zhang, Hao Chen, Yingqin Wang, Gang Wang, Lihong Li, Min Zhong, Hao Bai
Summary: This study provides a method for improving the performance of copper ceramic coatings by optimizing the key factor of SSWG-to-aggregate mass ratio in solid-state sintering. The research shows that an improper SSWG-to-aggregate mass ratio results in more internal defects and a decline in coating performance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mojtaba Najafizadeh, Mehran Ghasempour-Mouziraji, Deliang Zhang
Summary: The pack cementation method was used to deposit silicide on AISI D2 steel, resulting in deeper phase coatings and a double-zone structure. Diffusion coefficients were calculated using concentration profiles with different powders at 950 degrees C for 2 and 3 hours, and diffusion analysis was separately conducted for each phase.
Article
Materials Science, Ceramics
Zhao Wang, Yaming Wang, Shuqi Wang, Yongchun Zou, Guoliang Chen, Lei Wen, Guangxi Zhang, Lina Zhao, Jiahu Ouyang, Dechang Jia, Yu Zhou
Summary: A NbSi2/SiO2-Nb2O5/HfSi2-HfO2 multilayer ceramic coating with Hf-rich out layers was designed and prepared on a dense NbSi2 surface to enhance oxidation resistance. The coating showed a lower mass gain (40%) compared to the NbSi2 coating after 100 hours at 1200 degrees C. The presence of HfO2 and HfSiO4 phases anchored in the SiO2 scale improved the structural stability of the ceramic phase and blocked oxygen penetration, inhibiting Nb-oxide growth and crack initiation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Shan Li, Lairong Xiao, Sainan Liu, Yafang Zhang, Jiawei Xu, Xiaojun Zhou, Gang Zhao, Zhenyang Cai, Xiaojun Zhao
Summary: A novel composite ceramic coating was prepared on tantalum substrate using a three-step method to address the challenge of recyclability in high temperature oxidation environments. The coating exhibited superior performance and effective protection, possibly due to the formation of a composite oxide film with low oxygen permeability, moderate viscosity, thermal expansion coefficient, and good self-healing ability. The presence of an Nb interlayer mitigated thermal mismatch and reduced coating cracking.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Shuting Zhang, Peixuan Ouyang, Hongjuan Yan, Lina Si
Summary: In this study, Y-modified NiCrAlY coatings were prepared on the surface of thermal-sprayed NiCrAlY coatings. The oxidation resistance of the Y-modified coatings was significantly improved compared to traditional thermal sprayed coatings. The formation of highly stable intermetallic compounds Ni5Y in the Y-modified coatings was identified as the reason for the enhanced oxidation resistance.
Article
Materials Science, Multidisciplinary
Parviz Nourpoor, Soheila Javadian, Alireza Sabour Rouh Aghdam, Farzin Ghadami
Summary: The synergistic effect of Si and Ce addition on the oxidation resistance of a pack cementation aluminide coating on a Ni-based IN738LC superalloy substrate was investigated. The results showed that Si addition improved the oxidation resistance by forming beta-NiAl, delta-Ni2Al3, and delta-Ni2Si phases. Additionally, the addition of 1% Ce enhanced the formation of fine-grained microstructure and reduced element diffusion, resulting in improved cyclic oxidation resistance.
Article
Materials Science, Multidisciplinary
Zhenyang Cai, Yonghuang Wu, Huyun Liu, Gengyu Tian, Rong Pu, Shengming Piao, Xinyang Tang, Sainan Liu, Xiaojun Zhao, Lairong Xiao
MATERIALS & DESIGN
(2018)
Article
Materials Science, Multidisciplinary
Zhenyang Cai, Xiaojun Zhao, Daxu Zhang, Yonghuang Wu, Jianxi Wen, Gengyu Tian, Qinxuan Cao, Xinyang Tang, Lairong Xiao, Sainan Liu
Article
Chemistry, Physical
L. Guo, W. Y. Zhang, X. J. Zhoa, L. R. Xiao, Z. Y. Cal, R. Pu, X. Q. Xu
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2019)
Article
Nanoscience & Nanotechnology
Sainan Liu, Xinxiang Chen, Qiang Zhang, Jiang Zhou, Zhenyang Cai, Anqiang Pan
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Chemistry, Physical
Qiang Zhang, Yun Tong Huang, Xinxiang Chen, Anqiang Pan, Zhenyang Cai, Sainan Liu, Yi Zhang
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Multidisciplinary
L. R. Xiao, X. X. Tu, X. J. Zhao, Z. Y. Cai, Y. F. Song
Article
Materials Science, Multidisciplinary
Lairong Xiao, Xiaojun Zhou, Yifei Wang, Rong Pu, Gang Zhao, Ziqi Shen, Yali Huang, Sainan Liu, Zhenyang Cai, Xiaojun Zhao
Article
Materials Science, Ceramics
Lairong Xiao, Xueqing Xu, Sainan Liu, Ziqi Shen, Siyu Huang, Wentao Liu, Yuqing Peng, Yali Huang, Jianfei Liu, Yanchun Nie, Xiaojun Zhao, Zhenyang Cai
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Materials Science, Coatings & Films
Rong Pu, Yanan Sun, Jiawei Xu, Xiaojun Zhou, Shan Li, Bei Zhang, Zhenyang Cai, Sainan Liu, Xiaojun Zhao, Lairong Xiao
SURFACE & COATINGS TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
X. X. Tu, L. R. Xiao, X. J. Zhao, Z. Y. Cai, Z. W. Peng, D. M. Wei
Article
Materials Science, Ceramics
Dan Zhao, Yi Feng, Zhipeng Pi, Fan Zhang
Summary: Phase equilibria in the ZrO2-GdO1.5-TaO2.5 (ZGTO) system were experimentally investigated, and the differences between ZGTO and the existing ZrO2-YO1.5-TaO2.5 (ZYTO) were discussed. The study is useful for thermodynamic assessment of ZGTO and can guide the design of novel thermal barrier coatings materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yutaka Ohya, Wingki Mey Hendra, Chika Takai-Yamashita, Takayuki Ban
Summary: Diffusion couples of rutile and corundum single crystals were prepared and examined to study the solid solution and precipitation of corundum in rutile during cooling. Different precipitation forms of corundum were observed under different cooling conditions.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Jiaming Zhan, Yunfa Guo, Hao Wang
Summary: This study systematically investigates the mechanical behaviors of calcium fluoride in humid environments. The effects of water on the deformation and plastic enhancement of CaF2 under indentation are explored through microindentation experiments, atomic simulations, and Raman spectroscopy measurement.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hangfeng Zhang, Henry Giddens, Theo Graves Saunders, Matteo Palma, Isaac Abrahams, Haixue Yan, Yang Hao
Summary: The relationship between low and high frequency tunabilities in tin substituted barium titanate ceramics was investigated. It was found that there are differences in tunabilities at different frequencies due to the different activities of larger ferroelectric domains and polar nanoclusters.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Kaibiao Xi, Jiacheng Liu, Beibei Song, Huarong Cheng, Yihao Li, Xiaole Yu, Mupeng Zheng, Mankang Zhu, Yudong Hou
Summary: Composite modulation in the superparaelectric state of the BTBZ-CT system is proposed as an effective strategy to achieve both NTCC and excellent energy storage performance in dielectric ceramics. The addition of BZ and CT to BT ferroelectrics can move the SPE state to the normal use temperature zone, resulting in enhanced NTCC characteristics and energy storage performance. Furthermore, intentional precipitation of CT at grain boundaries can refine the grain size, increase the bandgap, and strengthen the local electric field distribution, thereby enhancing the breakdown electric field.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Hamed Salimkhani, Lovro Fulanovic, Till Froemling
Summary: The demand for robust multilayer ceramic capacitors with high-temperature and high-power capabilities is increasing rapidly. However, cost-effective production is a challenge. This study investigates the use of Na0.5Bi0.5TiO3-based materials as promising lead-free options. By adding sintering aids, the sintering temperature of Na0.5Bi0.5TiO3-BaTiO3-CaZrO3-BiAlO3 solid solutions was successfully reduced to 975 degrees C, suitable for co-sintering with Cu electrodes without adverse effects on capacitor properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Mingxing Li, Ran Mo, Zeshui Xu, Jie Zhou, Conglin Zhang, Xuefeng Cui, Fang Ye, Laifei Cheng, Ralf Riedel
Summary: Polymer infiltration and pyrolysis is an effective method for preparing ceramic matrix composites. The transformation of polymer to ceramic during the process affects the residual stress and interface behavior in the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yan Kang, Lin Chen, Chang-Jiu Li, Guan-Jun Yang
Summary: A novel abradable seal coating with low hardness and high bonding strength was successfully designed and prepared. This coating has significantly higher abradability and erosion resistance compared to metal-based coatings, and can retain excellent abradability and have a long lifetime during service.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Qingzhong Song, Xiangdong Zha, Ming Gao, Yingche Ma
Summary: This study analyzes the influence of calcia refractory purity on the properties of calcia crucibles. Higher purity calcia results in well-developed grains and improved hydration resistance, leading to better high-temperature strength and thermal shock resistance. In contrast, lower purity calcia crucibles exhibit inferior properties. Therefore, high-purity calcia is considered a potential refractory for manufacturing oxide crucibles.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Sehreish Abrar, Faisal Nazeer, Zhuang Ma, Ling Liu, Abdul Malik, Mustafa Kamal, Abdullah G. Al-Sehemi
Summary: To raise the operating temperature of Si-based ceramic matrix composites (CMCs), researchers have applied thermal/environmental barrier coating (T/EBCs) materials, typically rare earth silicates. However, the high thermal conductivity and the mismatch of thermal expansion have been major challenges in developing new materials that can offer thermal insulation and environmental protection to CMCs. In this study, entropy engineering was used to create a multicomponent equi-atomic single-phase pyro silicate with extremely low thermal conductivity and enhanced water vapor corrosion resistance. The research findings show the potential of high entropy disilicates in achieving ultra-low thermal conductivity and low weight loss in corrosive environments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Zi-bo Niu, Daxin Li, Dechang Jia, Zhihua Yang, Kunpeng Lin, Paolo Colombo, Ralf Riedel, Yu Zhou
Summary: In this study, SiBCN ceramics with a special structure were prepared to improve the oxidation resistance. The effect of the structure on oxidation behavior and kinetics was investigated, revealing that the special structure can effectively inhibit heterogeneous oxidation and enhance the oxide layer composition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Melike Donmez, Metehan Erdogan, Cihangir Duran
Summary: The limited densification of CeO2 ceramics was improved by using an anorthite-based glass, resulting in high dielectric constant and quality factor with minimum dielectric loss. The CeO2-(anorthite-based) glass ceramic showed promising results in terms of low temperature densification and microwave properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
S. Rahmati, R. G. A. Veiga, J. Mostaghimi, T. Coyle, A. Dolatabadi
Summary: This study provides an atomic-scale description of the high-velocity impact of alpha-Al2O3 particles onto an alpha-Al2O3 substrate during Aerosol Deposition (AD). The results suggest that the crystal orientation plays a crucial role in both plasticity and damage of the nanoparticles. Impact velocity has a direct correlation with plasticity and fragmentation, but adhesion efficiency has only a marginal increase. The crucial element lies in the substrate's surface alterations caused by the fragments left on the substrate after impact.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Bo-Wen Chen, Yan-Mei Kan, De-Wei Ni, Chun-Jing Liao, Hong-Da Wang, Yu-Sheng Ding, Shao-Ming Dong
Summary: This study characterized the long-term and repeated ablation properties of modified Cf/HfC-SiC composites with YB4-Al2O3-Si3N4 under an air plasma torch. The structural stability and viscosity of the oxide layer were found to affect the ablation resistance of the composites. By forming nano c-HfO2 grains and high-viscosity Al-Si-Y-O glassy phase, the structural stability of the oxide layer was improved, resulting in enhanced ablation resistance. However, the oxidation of Si3N4 led to the formation of NO, NO2, and excessive SiO2 glassy phase, which resulted in a porous structure and reduced the viscosity of the oxide layer. Therefore, the addition of Si3N4 decreased the ablation resistance of the composites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)
Article
Materials Science, Ceramics
Yongxing Wei, Huawei Zhang, Siyuan Dong, Changqing Jin, Chenxing Bai, Junle Dai, Zengzhe Xi, Zhonghua Dai, Zengyun Jian, Li Jin
Summary: In this study, solid solutions of xBi(Ni1/2Hf1/2)O-3-(1 - x)PbTiO3 (xBNH-PT) were synthesized to investigate their phase boundary behaviors and physical properties. The presence of a tetragonal-pseudocubic phase boundary and a spontaneous ferroelectric-relaxor transition at specific compositions were confirmed. The introduction of a tetragonal-pseudocubic phase boundary improved the piezoelectric properties and suppressed the spontaneous ferroelectric-relaxor transition.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)