Article
Physics, Applied
Guangdong Gao, Chi-Hsin Yang, Nankai He, Hao Gao, Kun-Chieh Wang, Wuhui Zou, Chao Xu
Summary: In this study, a tungsten tungsten carbide (W/WC) coating was prepared on stainless steel and silicon wafers using a special deposition technology. The results showed that the addition of C2H2 ionization increased the deposition rate and carbon content of the coating, but decreased the density and relative tungsten content. In addition, the hardness and elastic modulus of the coating were increased, while the adhesive strength was reduced. The prepared coating exhibited higher friction coefficient and wear rate.
MODERN PHYSICS LETTERS B
(2022)
Article
Engineering, Mechanical
Qianzhi Wang, Mingling Zhou, Xuxin Jin, Fei Zhou, Zhifeng Zhou
Summary: The co-incorporation of Ni and Cu at specific ratios (11.01% and 3.41% respectively) has been shown to significantly improve the hardness and wear resistance of CrBN coatings, with CuO acting as a lubricating layer. However, excessive Cu content can lead to a sharp decline in hardness and weaken the wear resistance of the coatings. Therefore, Ni (11.01%) and Cu (3.41%) is the proper co-incorporation combination for enhancing the mechanical and tribological properties of the coatings.
Article
Materials Science, Multidisciplinary
Jun Zhang, Yuncai Zhao, Yang He, Cheng Meng, Xinyu Zhang, Shilei Zhang
Summary: This study investigates the effects of high-temperature-assisted ultrasonic deep rolling (HT + UDR) on Ni-WC coatings. The results show that HT + UDR treatment leads to plastic rheology on the coating surface, eliminates visible cracks, and increases the coating's density. The coating after 0.25 mm preloading depth treatment exhibits the lowest friction coefficient and wear amount, indicating the best comprehensive tribological performance.
Article
Materials Science, Coatings & Films
Hao Zhang, Yingjun Pan, Yang Zhang, Guofu Lian, Qiang Cao, Linzhi Que
Summary: Mo2FeB2-WC-La2O3 composite coatings were prepared using a preplaced method of laser cladding. The addition of La2O3 significantly improved the metallurgical bonding between the coating and substrate. The microhardness and fracture toughness of the composite coating were optimal when it contained 0.3 wt% La2O3. The coating exhibited low coefficient of friction, wear rate, and good wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Shucai Yang, Pei Han, Xin Tong
Summary: This paper presents the results of tests on the friction characteristics of cemented carbide with a textured coating. The study reveals that appropriate parameters can reduce vibration and friction, and the main factors affecting them are coating thickness and micro-texture parameters. The thinner the coating, the higher the surface hardness and the smaller the changes in bonding force. Micro-textured cemented carbide experiences mainly adhesive wear, accompanied by oxidative wear.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Metallurgy & Metallurgical Engineering
Wang Wenquan, Du Ming, Zhang Xinge, Geng Mingzhang
Summary: In this study, a WC-Ni matrix cermet composite coating was prepared on an H13 steel substrate by electrospark deposition, with Ni or Mo transition layer. The coatings showed improved hardness values, lower friction coefficient and wear loss compared to the H13 steel substrate and WC-Ni coating. The Mo/WC-Ni composite coating exhibited better antiabrasive performance than the Ni/WC-Ni composite coating.
ACTA METALLURGICA SINICA
(2021)
Article
Engineering, Mechanical
Wanfu Dong, Jianping Lai, Jiaxin Yu, Udo D. Schwarz, Yifan Zhang, Kun Zhu, Amit Datye
Summary: Understanding the structure-property relationship is essential for designing metallic glasses with advanced properties. In this study, nanoscratching experiments were conducted to establish a correlation between the structure and nano-tribological behavior of Zr-based metallic glasses. The results showed that the scratching depth and residual depth of the scratch track increased with an increase in the material's fictive temperature. Additionally, the effect of the fictive temperature on the friction coefficient varied with the applied load, with adhesion-induced friction dominating at low loads and plowing dominating at high loads. The study also revealed the occurrence of scratch-induced yielding and suggested the possibility of using ramping load scratching to characterize the ductile-to-brittle transition of metallic glasses as an alternative to time-consuming fracture tests.
Article
Materials Science, Coatings & Films
Liu Detao, Kong Dejun
Summary: FeMnCoCr-WC coatings with different WC mass fractions were prepared on Ti6Al4V alloy to improve their tribological properties. The addition of WC resulted in grain refinement and increased coating hardness. The coefficients of friction and wear rates of the coatings decreased with the increase in WC mass fraction at both room temperature and 500 degrees C. The wear mechanism of the coatings also changed with the WC mass fraction at room temperature, while it remained unchanged at 500 degrees C.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jinming Li, Yuhua Huang, Yuqi Zhou, Fulong Zhu
Summary: Molecular dynamics simulations were used to investigate the repeated nanoindentation on aluminum substrate with varying thicknesses of boron nitride nanosheet coating. The study reveals that the hardness of the substrate increases with coating thickness. The pressure area of the aluminum substrate also increases with coating thickness. The coating force causes more atoms to move along the loading direction, leading to substrate slip and severe atomic strain. However, some aluminum atoms are able to elastically recover after unloading, despite being severely deformed. After multiple loadings, elastic deformations transition into plastic deformations, possibly accompanied by lattice structure destruction and the presence of amorphous atoms.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Dominic Linsler, Friederike Ruebeling, Christian Greiner
Summary: This study investigated the relationship between the evolution of a dislocation trace line and pronounced plastic deformation in bcc iron by sliding a ruby ball against electropolished bcc iron. The analysis of wear track topography and subsurface microstructure suggested a connection between the two factors.
Article
Engineering, Mechanical
Sergey Grigoriev, Alexey Vereschaka, Filipp Milovich, Mars Migranov, Nikolay Andreev, Jury Bublikov, Nikolay Sitnikov, Gaik Oganyan
Summary: Raising temperature significantly decreases the adhesion component of the friction coefficient for coated samples, leading to internal cracking and delamination. Increasing cutting speed results in greater diffusion depth of coating elements and a slight decrease in the adhesion component of the friction coefficient.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
S. Lay
Summary: Geometrical calculations were used to evaluate the resistance of WC grain boundaries in WC-Co cemented carbides to transfer plastic deformation. It was found that E = 2 and E = 4 grain boundaries are more resistant to dislocation propagation compared to other grain boundaries, which could be controlled to tune the material properties.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Chemistry, Physical
Peter Panfilov, Irina Milenina, Dm Itry Zaytsev, Alexander Yermakov
Summary: The deformation and fracture behavior of cold drawing iridium wire under tension at room temperature was examined. It was found that the wire exhibited brittle deformation behavior initially, but began showing high plasticity, including necking, after the lamellar structure was formed during cold drawing.
JOHNSON MATTHEY TECHNOLOGY REVIEW
(2021)
Article
Engineering, Mechanical
M. G. Gee, K. Mingard, J. W. Nunn
Summary: Micro-tribology experiments were conducted on WC/Co hardmeatal samples to investigate the mechanisms of damage during abrasion. Plastic deformation of WC grains and Co binder phase was observed at all test loads. The visibility of slip increased with increasing load, leading to fracture of WC grains at higher loads. EBSD analysis confirmed the relationship between plastic deformation and orientation of WC grains, and detected transformation of fcc Co phase to hcp phase near the scratch path.
Article
Materials Science, Ceramics
Zhenhai Guo, Fuming Deng, Lei Zhang, Cen Hao, Xin Zhao, Daohui Xiang
Summary: The experimental results show that under dry friction conditions, the texture structure has a significant impact on the friction coefficient and wear resistance of diamond coatings. For the same type of textures, the larger the texture surface area, the lower the friction coefficient. Elliptical textures can capture abrasive particles and reduce the friction coefficient of diamond coatings.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Kai Guo, Hao Lu, Zhi Zhao, Fawei Tang, Haibin Wang, Xiaoyan Song
Summary: Due to the complex crystal structures and interatomic interactions, predicting the magnetic properties and effective composition design of rare earth permanent magnets is challenging. In this study, rapid and accurate prediction of the saturation magnetization of Sm-Co alloys was achieved through machine learning and the selection of characteristic elements. The developed methods are applicable for predicting properties and designing compositions of multicomponent alloys.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xuemei Liu, Zhantao Liang, Haibin Wang, Zhi Zhao, Chao Liu, Hao Lu, Xiaoyan Song
Summary: In this study, WCoB was added to ultra-coarse cemented carbides to improve the oxidation- and wear-resistance at elevated temperatures. The addition of WCoB enhanced wear resistance by restraining the WC grains, and also inhibited oxidation by forming liquid B2O3 in the oxidation layer and sharing stress with WC matrix.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Huaxin Hu, Xuemei Liu, Jinghong Chen, Hao Lu, Chao Liu, Haibin Wang, Junhua Luan, Zengbao Jiao, Yong Liu, Xiaoyan Song
Summary: This study proposes a method to enhance the high temperature compression strength of ultra-coarse cemented carbides by modulating hard matrix grains using activated TaC nanoparticles, through solid solution strengthening of Ta atoms. The mechanisms of Ta dissolution in WC crystal and strengthening of ultra-coarse grains through interaction with dislocations were revealed at the atomic scale.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Jinghong Chen, Xuemei Liu, Hao Lu, Haibin Wang, Xiaoyan Song
Summary: The effects of representative sintering techniques on the residual thermal stress (RTS) in WC-Co composites were investigated. The processing parameters of spark plasma sintering (SPS) and sinter-hot isostatic pressing (Sinter-HIP) were used to quantify RTS and its mechanisms. The results showed that the WC phase had compressive stress and the Co phase had tensile stress during cooling. The RTS was more concentrated at the acute dihedral angles of WC/Co interfaces in SPSed cermets.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Tielong Han, Chao Hou, Yaochuan Sun, Yurong Li, Xiaoyan Song
Summary: In this study, an ultrafine-grained W-Cu composite was fabricated using electroless plating and spark plasma sintering. The wear resistance and high-temperature compressive properties were investigated and compared with a commercial coarse-grained counterpart. The results show that the ultrafine-grained W-Cu composite exhibits superior mechanical performance, suggesting its potential as an alternative to commercial W-Cu composites.
Article
Nanoscience & Nanotechnology
Wentao Jiang, Hao Lu, Jinghong Chen, Lei Luo, Xuemei Liu, Haibin Wang, Xiaoyan Song
Summary: This study proposes an approach for toughening ceramic-based composites by modulating strain partition and stress distribution in phase-boundary regions. The concept of homogenizing lattice strain based on collective lattice shear is introduced to achieve high fracture toughness in ceramic-based composites. The feasibility of this strategy is demonstrated using ZrO2-containing WC-Co ceramic-metal composites. The crystal planes along the WC/ZrO2 martensitic transforming phase boundaries exhibit significantly larger and uniform lattice strains compared to conventional dislocation pile-up phase boundaries, enabling the composite to have high fracture toughness and hardness simultaneously. The homogenizing lattice strain strategy proposed in this study is applicable to a broad range of ceramic-based composites to achieve superior comprehensive mechanical properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Xuyang Yuan, Xuean Chen, Weiqiang Xiao, Xiaoyan Song
Summary: A new rare-earth orthoborate Ba2CdSm2(BO3)4 was synthesized using the high temperature molten salt method and its crystal structure was determined. It exhibits a complex three-dimensional framework composed of distorted polyhedra and planar tri-angles, with open channels hosting Ba2+ and Ba2+/Sm3+ cations. The compound shows orange-red emission under near-UV excitation and has stable luminescent properties at elevated temperature.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Zhantao Liang, Xuemei Liu, Zhi Zhao, Hao Lu, Haibin Wang, Chao Liu, Mingsheng Wang, Xiaoyan Song
Summary: A novel method was proposed to achieve uniform dispersion of ZrO2 nanoparticles in the WC matrix, resulting in WC-ZrO2 ceramics with outstanding mechanical properties. The high toughness of the ceramic was attributed to stress-induced phase transformation, a homogeneous ultrafine microstructure with coherent WC/ZrO2 interface, and stress release of WC near ZrO2. Factors like crack deflection and crack bridging further enhanced the fracture toughness. The contribution to toughness by ZrO2 phase transformation was found to be 1.9 and 2.7 times higher than that of crack deflection and crack bridging, respectively. This study provides a strategy to significantly increase the toughness of ceramics while maintaining high hardness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Multidisciplinary
Chao Hou, Hao Lu, Zhi Zhao, Xintao Huang, Tielong Han, Junhua Luan, Zengbao Jiao, Xiaoyan Song, Zuoren Nie
Summary: The challenge of fabricating nanostructured W-Cu composites has been solved by modulated phase separation. By using intermediary Al, a hierarchically nanostructured W-Cu composite with stable interfaces and high mechanical performance has been achieved.
Article
Engineering, Multidisciplinary
Maobao Xu, Xuemei Liu, Hao Lu, Haibin Wang, Zhi Zhao, Chao Hou, Tielong Han, Xiaoyan Song
Summary: This work was supported by the National Key R & D Program of China (2022YFB3708800) and the National Natural Science Foundation of China (92163107, 52271085, 52101003, 52171061, 52101031).
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Wentao Jiang, Hao Lu, Xuemei Liu, Haibin Wang, Dongyang Li, Chao Liu, Mingsheng Wang, Xiaoyan Song
Summary: In this study, WC-Co cermet was used as a representative material to investigate its wear failure behavior and protection effectiveness. It was found that the wear mechanism transitions from mechanical wear to oxidative wear with increasing temperature. The addition of zirconia significantly improves the anti-oxidation performance and load-bearing capacity of the cermet, mainly through the modulation of the tribo-oxide layer compositions and changes in surface morphology. Based on the understanding of temperature- and oxidation-induced compositional and microstructural evolutions, a promising approach for developing ceramic-metal composites with high wear resistance and anti-oxidation capability is proposed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Xingwei Liu, Haibin Wang, Hao Lu, Xuemei Liu, Zhi Zhao, Chao Hou, Lin Gu, Xiaoyan Song
Summary: A new type of grain-interior planar defect was discovered in TiC doped cemented tungsten carbides. The monolayers of metal atoms exist stably in ceramic grains, induced by ordered heteroatoms on specific crystal planes. The composition, structure, and crystallography of the planar defects were characterized, and their energy state and stability were evaluated. Tailoring the distribution density of the planar defects can enhance the mechanical properties of materials.
ADVANCED POWDER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xuean Chen, Jinyuan Zhang, Weiqiang Xiao, Xiaoyan Song
Summary: A new mixed metal borate, CdTbGaB2O7, was synthesized and its crystal structure was determined. It belongs to a new member of the melilite family and has a 3D framework consisting of alternating tetrahedral layers and cationic layers interconnected via bridges. CdTb1-xSmxGaB2O7 solid solutions were also prepared. The materials showed color-tunable phosphorescence, making them potential candidates for UV w-LEDs.
Article
Chemistry, Physical
Shuqing Zhang, Sitong Huo, Xiaoyan Song, Xinping Zhang
Summary: Exfoliation of two-dimensional magnetic materials from non-vdW materials has become a topic of increased interest for the construction of 2D magnetic materials. Few-layer samples of non-vdW magnetic chromium tellurides, which possess high Curie temperatures, show promising applications in spintronics. The termination of the surface structures of few-layer chromium tellurides by either Cr or Te atoms remains under debate. Surface and exfoliation energy calculations reveal that the stability of the structures depends greatly on the chemical potential of Te atoms, and the few-layer sample with a Cr-terminated surface is easier to exfoliate than the one with both Te-terminated surfaces. Furthermore, the atomic number ratio of Cr to Te and the average magnetic moment of Cr atoms in few-layer samples can be used to identify different exfoliated structures.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
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)
