Article
Materials Science, Ceramics
Ankur Sharma, Dagarapu Benny Karunakar
Summary: This study investigates the effect of TiC addition on the ablation and thermal shock resistance of microwave sintered ZrB2-25 SiC composites. The results show that the addition of TiC improves the ablation and thermal shock resistance due to the formation of protective TiO2 and ZrO2 layers on the surface of the oxidized composites. The composites exhibit high hardness and fracture toughness after ablation, with crack deflection and crack bridging observed as the primary toughening mechanisms. Furthermore, the thermal shock resistance is enhanced as indicated by increased thermal shock parameters and critical temperature difference with TiC addition.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Liangbo Sun, Xiaosong Shi, Xinyu Liu, Jian Fang, Chunfeng Liu, Jie Zhang
Summary: This study investigated the joining of Cf/SiC and Si3N4 using glass and identified direct bonding as the main interfacial bonding mechanism. The joint showed a maximum shear strength of -34 MPa and remained at -13 MPa after thermal shock for 10 cycles. Bubbles in the glass filler were found to be the main factor causing degradation of joint performance. Improving the high temperature resistance of joining materials is suggested for application of this joint structure.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Chao Wang, Xu Wang, Binglei Wang, Guozheng Xiao, Ruiqing Qiao, Fan Zhang, Yu Bai, Yizhuo Li, Yusheng Wu, Zhanjie Wang, Hongjie Wang
Summary: A dense beta-Si3N4 coating toughened by beta-Si3N4 nanowires/nanobelts was prepared using a combined technique of chemical vapor deposition and reactive melt infiltration to improve thermal shock resistance. The coating exhibited high fracture toughness and maintained high residual strength ratio after thermal cycling, showing potential for applications in extreme high temperature environments.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Xiaoyan Wang, Shaopeng Li, Yuanfei Han, Guangfa Huang, Jianwei Mao, Weijie Lu
Summary: This study investigates the role of reinforcements in the microstructural evolution of titanium matrix composites (TMCs) during high-temperature fatigue, revealing a new phenomenon of twin nucleation. The presence of reinforcements enhances dislocation accumulation and promotes the rapid diffusion of elements, leading to an increase in local stress concentration and ultimately contributing to twin nucleation. This work contributes to a better understanding of the mechanism underlying TMC fracture during high-temperature fatigue.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Manufacturing
Nalin Somani, Nitin Kumar Gupta
Summary: The addition of TiC nanoparticles in Cu-TiC nanocomposites significantly improves the hardness and tensile strength, while also enhancing wear resistance and reducing the coefficient of friction. Analysis of worn surfaces morphology and microstructures using SEM and EDS techniques under high load, speed, and distance conditions helps to understand the underlying wear mechanism.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2022)
Article
Materials Science, Composites
Umesh Marathe, Meghashree Padhan, Jayashree Bijwe
Summary: The adhesion between polymer reinforced with TiC nanoparticles and steel surface is influenced by factors such as surface free energy, shape, amount, and size of particles, and reinforcement effects in causing cohesive or adhesive failure. Nanocomposites containing TiC nanoparticles outperformed microcounterparts in various physical, thermal, mechanical, and adhesive strength properties. The extent of adhesive failure decreased and cohesive failure increased with an increase in nano-particles, as validated by available models for nanocomposites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yaghoub Pazhouhanfar, Seyed Ali Delbari, Mehdi Shahedi Asl, Shahrzad Shaddel, Morteza Pazhouhanfar, Quyet Van Le, Mohammadreza Shokouhimehr, Mohsen Mohammadi, Abbas Sabahi Namini
Summary: This research compared the sintering behavior and physical-mechanical characteristics of TiC and TiC-Si3N4 ceramics, revealing the deposition of carbon in monolithic TiC and the in-situ formation of SiC and N-2 phases when Si3N4 was incorporated. Despite the thermodynamic assessment suggesting the in-situ synthesis of TiN, no evidence of it was found in the experiment. The TiC-Si3N4 ceramic showed thermal conductivity of 10.1 W/mK, Vickers hardness of 2966 HV0.1kg, and flexural strength of 219 MPa.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Ceramics
Zhiyuan Ma, Huichao Cheng, Jinglian Fan, Zhenwei Wang, Zhanggen Liu
Summary: This study aimed to enhance the fracture toughness of Si3N4 ceramics by adding TiC and Mo. The addition of TiC improved the hardness by inhibiting phase transformation and grain refinement. Meanwhile, Mo promoted phase transformation and formed molybdenum silicide, leading to improved fracture toughness. The Si3N4 composites with 8 wt% TiC and 8 wt% Mo exhibited optimal properties.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Zongwei Tong, Zhengdao Liu, Huijun Yu, Baojie Zhang, Xiaolei Li, Dong Su, Huiming Ji
Summary: The Si3N4-m-BAS composite has excellent dielectric properties, low density, and low thermal expansion coefficient. A dense Si3N4-BAS coating was successfully prepared on porous Si3N4 ceramic, improving its water resistance and ensuring dielectric performances. The coating exhibited low water absorption, high bonding strength, and self-healing properties during thermal shock tests.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Guandong Liang, Jianqiang Bi, Linjing Qiao, Zhuangzhuang Yin, Shaoyin Wang
Summary: The gel-casting process was successfully applied to porous Si3N4 wave-absorbing composites in order to address the lack of suitable conformal, load-bearing, light-weight, and high temperature-resistant integrated wave-absorbing composites for complex conditions. A universal low-slurry for gel casting was prepared by using two dispersants acting together, ensuring the smooth completion of the gel casting process. Reasonable parameters of the rubber discharge process were given to avoid the problem of the green body swelling and cracking, resulting in the successful preparation of porous TiC/Si3N4 composites.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Composites
Dong Ma, Cheng Wang, Wenlong Xu, Shiyu Jia
Summary: This study focuses on improving the shock wave mitigation performance of polymer composites by adding different nanocarbon fillers. The results show that the addition of nanocarbon fillers can enhance the shock wave mitigation ability of epoxy resin, with graphene fillers demonstrating the best effect.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Physical
Tanay Rudra Paul, Manas Kumar Mondal, Manab Mallik
Summary: The effect of SiCw volume fraction on the thermal shock resistance (TSR) of ZrB2-20 MoSi2 composite was studied in this work. The results showed that increasing the silicon carbide percentage reduced the crack growth rate and increased the critical temperature differential, leading to improved TSR of the composites. The development of thermal residual stresses due to thermal shock resulted in excellent crack shielding and higher TSR of the ZMSw20 composite.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Yangyang Hu, Yonghui Xie, Haiming Xin, Juan Chen, Shizhong Liu, Yongsheng Li, Chonghai Xu
Summary: A simple self-assembly method was used to synthesize reduced graphene oxide-encapsulated alumina nanohybrids, which were added to an Al2O3-TiC matrix to fabricate ceramic composites. Microstructural analysis showed that the graphene sheets were well dispersed in the matrix and formed a 3D network, leading to improved load transfer efficiency and contact surface area. The interface characteristics revealed the presence of weak and strong hybrid interfaces, which promoted load transfer and induced toughening mechanisms.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Yanjing Yin, Ke Yan, Fei Chen, Yongsheng Zhu, Jun Hong
Summary: In this study, the tribological properties of ceramic-based self-lubricating materials were investigated. The presence of multilayer graphene and 8-Si3N4 whisker was found to significantly reduce the coefficient of friction. The reduction was attributed to the comprehensive enhancement of mechanical properties and the presence of graphene lubricating film.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xiao Yang, Xuejian Liu, Hui Zhang, Zhengren Huang
Summary: The thermal shock resistance of silicon nitride was studied using a water quenching method, and the differences in residual strength after thermal shock were analyzed. The results showed that the surface layer of the samples changed with increasing heat treatment temperature, forming a darker subsurface layer, in which more small pores were found and played a role in dissipating thermal stress. However, this subsurface layer disappeared during natural cooling, leading to the formation of large cracks on the surface layer.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Ziyan Zhao, Kaiyue Zheng, Xianghui Yu, Qian Qi, Lujie Wang, Yan Liu
Summary: In-situ TiC/Ni composites with Ta element were fabricated by reactive sintering. It was found that Ta element could reduce the oxidation rate and decrease the content of TiO2 and NiTiO3 in the oxide scale, thereby optimizing the oxidation resistance and electrical conductivity of the composites.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Kai Wang, Mingyuan Ma, Yingchun Diao, Qijun Huang, Xiangkui Zhou, Guojian Li, Qiang Wang
Summary: The relationship between the V(C, N) content and the thickness of the gradient layer in nanocrystalline cemented carbides was investigated. The introduction of V(C, N) was found to enhance the mechanical properties of these materials.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Claudio Bertalan, Steven Moseley, Leonel Pereira, Ralph Useldinger
Summary: The influence of sintering temperature, dwelling time at maximum temperature and carbon content on the microstructure and mechanical and magnetic properties of WC-6%Co hardmetal was investigated. Results showed that to maximize hardness and transverse rupture strength (TRS), sintering should be performed at a low temperature (< 1400°C) and with a dwelling time of at least 75 minutes. This is particularly important for low carbon parts to ensure the necessary microstructure homogeneity required for high TRS.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Longlong Sun, Hang Li, Ningxin Wei, Jianliang Li, Jiewen Huang, Jian Kong, Qiujie Wu, Yan Shi, Dangsheng Xiong
Summary: By regulating the microstructure of TaBx films deposited by magnetron sputtering, the hardness and wear resistance of the films can be improved. With the increase of the bias voltage, the B content decreases and the crystallinity is enhanced. The microstructure of the films transforms from fibrous to dense columnar and then to granular structure. At a bias voltage of -180 V, the films exhibit super high hardness and relatively moderate fracture toughness.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Liang Xia, Kai Liu, Yucheng Cao, Chao Jiang
Summary: This study investigates the microstructure information and mechanical behavior of ion-irradiated zirconium alloys through experimental measurements and theoretical analysis. Experimental procedures involve Au3+ irradiation of specific alloys, and transmission electron microscopy analysis reveals the formation of precipitates and their transformation after ion-irradiation. Macroscopic mechanical properties are characterized by nano-indentation tests, revealing significant indentation size effect and irradiation hardening behavior. A mechanistic model is developed to explain the depth-dependent hardness observed in ion-irradiated zirconium alloys.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Jiangtao Zhang, Guoqin Huang, Yangli Xu, Jianyu Wang, Guangyao Han, Yuanqiang Tan
Summary: Selective laser melting (SLM) provides a novel method for the integrated production of structural and functional metal-matrix diamond composites in the field of diamond tools. In this study, a discrete element method model is developed to simulate the spreading process of diamond/CuSn composite powders. The findings reveal that adjusting the physical properties of diamond particles and process parameters can improve the powder bed quality and particle dynamics, leading to better performance of diamond tools.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Roman Gabor, Ladislav Cvrcek, Karel Masek, Josef Hlinka, Oldrich Motyka, Jan Walter, Grazyna Simha Martynkova, Gabriela Mikeskova, Jana Seidlerova
Summary: This study investigated the surface modification of β-Ti39Nb alloy using micro-arc oxidation technique, and examined the relationships between surface chemical composition, morphology, and tribological and corrosion properties. The results showed that the technique improved the wear resistance of the alloy, and the particle analysis confirmed the correlation between particle composition and tribological parameters.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Benedetto Bozzini, Matteo Amati, Luca Gregoratti, Majid Kazemian, Francesco Tavola, Sandra Tedeschi, Gian Pietro De Gaudenzi
Summary: In this study, the composition and chemical state of the surface of hardmetal subjected to controlled electrochemical corrosion were analyzed using synchrotron-based scanning photoelectron microscopy and photoelectron microspectroscopy. The results showed that corrosion under different conditions led to surface enrichment and leaching of different chemical elements and species.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
B. Roebuck, M. G. Gee, K. P. Mingard, H. G. Jones, H. Zhang, V. Tong
Summary: Metrology provides scientific support for the practical use of testing standards and helps establish a common language for different users regarding material capabilities. The hardmetal industry already has numerous international standards, but there is still room for improvement in certain testing strategies. The Materials Group at the National Physical Laboratory in the UK focuses on metrology and has highlighted specific metrological issues that need further attention. These include high hardness measurements, dislocation analysis, micro-tribology, nanoindentation, and structural characterization.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Suyeon Kim, Taehyun Kwon, Seulgi Kim, Sung Ho Song, Dongju Lee
Summary: This study examines the effect of two different methods, oxide reduction and mechanical alloying, on the sintering behavior and microstructure of molybdenum-tungsten sintered compacts. The sintered compacts produced with oxide-reduced nanopowders exhibit higher density, purity, and a finer microstructure, making them more suitable for sputtering targets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
A. M. Ferro Rocha, A. M. Santos, R. Mineiro, P. Pereira, J. Sacramento, A. M. R. Senos, A. C. Bastos
Summary: This study compares the corrosion resistance of different hardmetal composites and their binders in a corrosive environment. Through electrochemical testing methods, the corrosion behavior of these materials was studied, and the influence of the binder's electrochemical behavior on the corrosion resistance of hardmetal was explored.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bo Li, Yong Zheng, Wangwang Wang, Hao Wu, Yufan Li, Jin Lv
Summary: The effects of various Cr doping amounts on the microstructure and properties of Mo2FeB2-based cermets were investigated using EDS, SEM, and TEM. The results showed that moderate Cr doping enhanced the system's wettability, fracture toughness, and transverse rupture strength, while excessive Cr addition decreased mechanical properties. The solid-solution of Cr in the hard phase had the most pronounced effect on the mechanical properties of the cermets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Min Lian, Fei Wang, Kaixuan Rong, Xiaoci Ma, Hetian Liu, Xinmiao Gai, Yufei Ge, Shushan Dong, Qiang Tao, Pinwen Zhu
Summary: This study successfully optimized the toughness of polycrystalline diamond (PCD) by adjusting the intergranular fracture (IF) and transgranular fracture (TF) modes. The results showed that a mixture of the IF and TF modes resulted in higher hardness and toughness in PCD compared to a single fracture mode. The toughness of the PCD was approximately three times that of single-crystal diamonds and comparable to that of pure nanotwinned diamonds. The mixed modes introduced toughening mechanisms such as high frequency large crack deflection, crack bridging, pull-out, and crack branching, which increased the toughness of the PCD.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ruifang Wang, Xiang Zhan, Yongqiang Chen, Chao Zhang, Yusi Che, Jilin He
Summary: The particle size and morphology of tungsten powders play a crucial role in determining the processing properties of tungsten products. This study investigated the effects of water vapor partial pressure on the hydrogen reduction of tungsten oxides, and proposed a method of changing the particle size of tungsten powders using bottom blowing hydrogen. The experimental results showed that bottom-blowing hydrogen could improve the uniformity of tungsten powders in a crucible by eliminating discrepancies in water vapor partial pressure. The partial pressure of water vapor increased with the temperature of the water bath, leading to an increase in the average particle size of tungsten powders.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oladapo Eso, Xu Wang, Samuel Wolf, Travis Puzz
Summary: In recent decades, there has been an increasing trend in incorporating alloying additives into WC-Co hardmetals for property enhancement. This paper establishes correlations between properties and microstructure of binder modified WC-Co compositions, and explains the observed property correlations.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)