CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 21
·30039-30042
·
IF 4.527
Leihao Feng,Qiwei Hu,Li Lei,Lei Qi,Leilei Zhang,Meifang Pu,Zili kou,Fang Peng,Duanwei He,Yohei Kojima,Hiroaki Ohfuji,Tetsuo Irifune
High-hardness TaN compacts with a diameter and height of 6 mm were synthesized through the phase transformation of CoSn-type into WC-type TaN under experimental conditions of high temperature and high pressure . The Vickers hardness of WC-type TaN compacts obtained at the pressure of 5 GPa and the temperature of 1873 K is found to be ~21.5 ± 1.5 GPa with a load of 3 Kg, which is comparable to that of the pure tungsten carbide compact (~20 GPa) and higher than those of ultrahigh temperature ceramics ZrB 2 and HfB 2 under the same load. The high hardness of WC-type TaN compacts presented in this work is attributed to the deviatoric strain and well-bonded nanograins . The synthesized WC-type TaN compacts also possess a high oxidation temperature (1072 K). These results suggest that the WC-type TaN with high hardness and high thermal stability holds great promise for industrial applications.
研究领域:
材料科学
·
无机非金属材料
·
超硬材料
·
高温材料
·
固态化学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Yu Mei Zhou,Feng Lin Zhang,Peng Cheng Li,Kun Bai,Shang Hua Wu
AlMgB14 is a very hard and brittle material which need be modified for utilizing as cutting tool materials. In present study, TiB2 and Ni3Al were used to strengthen and toughen AlMgB14 material. The microstructure of the AlMgB14-TiB2-Ni3Al composites was analysized by scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDX) and an X-ray diffractometer (XRD). The hardness and fracture toughness of the AlMgB14-TiB2Ni3Al composites were also examined. The results showed that the major phases in AlMgB14-Ni3Al composites were TiB2, AlMgB14, MgAl2O4 , Ni3Al and NiAl. With the increasing of the amount of Ni3Al, more intergranular fractured features can be found in the fractured surface of the composites, the hardness and fracture toughness of the composites were both decreased comparing to the synthesised AlMgB14. The AlMgB14-TiB2-4wt.% Ni3Al composite has a hardness of 28.1 Gpa and a fracture toughness of 3.14 MPa·m1/2.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
MACROMOLECULES
·
2025
·
IF 5.2
Meijia Gong,Luping Wang,Kaiyang Hou,Kaiqiang Zhang,Xu Wang
Optimizing supramolecular interactions is crucial for enhancing the damage resistance of elastomers under extreme mechanical stresses. However, the underlying mechanisms remain not fully understood, making targeted design challenging. This study thoroughly investigates a series of polyurethane elastomers and presents a strategy to enhance elastomer damage resistance by tuning the number and strength of hydrogen bonds at the hard–soft interface. Within these elastomers, we find that the hardness is positively correlated with the number and strength of hydrogen bonds, while toughness increases with the number of hydrogen bonds, reaching a maximum at moderate bond strength. Elastomers with both high hardness and toughness demonstrate superior impact resistance, while the best tear resistance is achieved with moderate hardness and high toughness. By balancing hydrogen bond acceptors in the soft segment with donors in the hard segment, an elastomer with an exceptional impact strength of 9.2 MJ m–2 is obtained, and tear resistance of 275.0 kJ m–2 is achieved by modulating the interaction strength. This research clarifies structural factors influencing damage resistance, including the number and strength of hydrogen bonds at the hard–soft interface, offering valuable insights for the design of highly impact- and tear-resistant elastomers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 19
·期 4
·1916-1928
·
IF 2.328
Xiao-Chun Deng,Kai-Fei Wang,Guo-Hua Zhang
Combining spray drying and in situ synthesized technology, WC–10Co cemented carbide with uniform composition was prepared by vacuum sintering. The effects of Al 2 O 3 and additions of different rare-earth oxides (La 2 O 3 , Y 2 O 3 and CeO 2 ) on the microstructure and mechanical properties of WC–10Co were investigated. As the Al 2 O 3 content increased from .5 to 2 wt%, the hardness of the sintered sample increased, whereas the relative density and fracture toughness decreased. Compared with the addition of .5 wt% Al 2 O 3 , the WC–10Co alloy with .5 wt% rare-earth oxides had higher hardness. In addition, compared with the alloy without an inhibitor (.80 μm), after adding .5 wt% Al 2 O 3 , La 2 O 3 , Y 2 O 3 and CeO 2 , the WC grain sizes were reduced to .73, .65, .71 and .62 μm, respectively, which indicated that the addition of Al 2 O 3 and rare-earth oxides could refine WC grain during sintering. Among these additives, CeO 2 had the best effect. With the addition of .5 wt% CeO 2 , the hardness and the fracture toughness increased from 1299 to 1710 HV 30 and from 16.18 to 18.90 MPa m 1/2 , respectively.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yao Yang,Jianqiang Bi,Kangning Sun,Linjing Qiao,Guandong Liang,Hongyi Wang,Jilie Yuan,Yueguang Chen
The relationship between the chemical elements of high-entropy boride (HEB) ceramics and their hardness is important for the prediction of high-hardness HEB ceramics. In this work, by designing four HEB ceramics with different chemical elements, the effect of lattice parameter difference factor (δ, represents the difference-degree in lattice parameters among the five individual constitute diborides) on phase composition and lattice-distortion, and the effect of rule of mixture (ROM) average hardness and lattice-distortion on HEB ceramics hardness were studied. The results indicated that, as δ value increases, more severe lattice-distortion occurs inside the HEB ceramics, and a single solid-solution is difficult to be formed. Furthermore, lattice-distortion and the ROM average hardness codetermine the HEB ceramics hardness. The greater lattice-distortion brings about significantly higher hardness for HEB ceramics than their ROM average hardness. Among the four HEBs, (Hf 0.2 Zr 0.2 Ta 0.2 V 0.2 Nb 0.2 )B 2 exhibits the high hardness of 26 GPa measured using a load of 9.8 N.
研究领域:
材料科学
·
陶瓷
·
力学性能
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 9
·3031
·
IF 3.748
Shijing Zhao,Wenju Zhou,Xiaojun Xiang,Xuyan Cao,Ning Chen,Weifeng Chen,Xiaohui Yu,Bingmin Yan,Huiyang Gou
The precise determination of atomic position of materials is critical for understanding the relationship between structure and properties, especially for compounds with light elements of boron and single or multiple transition metals. In this work, the single crystal X-ray diffraction is employed to analyze the atomic positions of Co2MoB4and Fe2MoB4with a Ta3B4-type structure, and it is found that the lengths of B-B bonds connecting the two zig-zag boron chains are 1.86 Å and 1.87 Å, but previously unreported 1.4 Å. Co and Fe atoms occupy the same crystallographic position in lattice for the doped samples and the valence is close to the metal itself, and Co/Fe K-edge X-ray Absorption Fine Structure(XAFS) spectra of borides with different ratios of Co to Fe are collected to detect the local environment and chemical valence of Co and Fe. Vickers hardness and nano indentation measurements are performed, together with the Density Functional Theory (DFT) calculations. Finally, Co2MoB4possess better thermal stability than Fe2MoB4evaluated by Thermogravimetric Differential Thermal Analysis (TG-DTA) results.Keywords:transition metal boride;hardness;XAFS;thermal stability
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
Food & Function
·
2020
·Vol. 11
·期 9
·7727-7735
·
IF 4.171
Yuan Gao,Shimin Wu
A novel oleogel system was developed, and its characteristics and properties were investigated. The results indicate that a low-cost, low-fat and low hardness oleogel product was formed by potato starch, candelilla wax, oil, and distilled water. Specifically, the content of potato starch and candelilla wax in the oleogel system was 5 wt%. A potato starch/candelilla wax ratio from 1.22 to 5.67 led to the formation of a type II starch-lipid oleogel system, and the content of distilled water was 45 times the starch content. All the above-mentioned information demonstrated that starch/wax-based oleogels are a typical lipid system. They can reduce the content of wax and oil in oleogel systems, form oleogel products with low hardness values and exhibit great potential in the field of low-fat food and low-cost food industrial applications.
研究领域:
食品科学
·
材料科学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Kaiwen Xie,Xiang Xu,Chengcheng Gao,Zhenjiong Wang,Linghan Meng,Xiao Feng,Xiaozhi Tang
The regulatory effects of different mannuronate/guluronate ratios in sodium alginate (SA) and calcium ion (Ca 2+ ) concentrations on the structure and properties of starch-SA interpenetrating polymer network (IPN)-enhanced extruded buckwheat noodles were investigated. The thermal stability of buckwheat noodles was improved by increasing the G block proportion, and 1% Ca 2+ concentration led to the highest thermal stability. With increasing G proportion and Ca 2+ concentration, cooking loss and elongation at break of extruded noodles gradually decreased. The cooking time initially decreased and then increased. Noodle hardness, chewiness, and breaking strength significantly increased. In vitro starch digestion showed that when the SA M/G ratio was 1:2 and the Ca 2+ concentration was 1%, the predicted glycemic index of noodles was the lowest and the resistant starch content was the highest. According to curve fitting based on the sensory evaluation results, the overall noodle acceptability was higher when hardness was between 3800 and 5200 g.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2025
·
IF 3.3
Zhang Jian,Chen Hongxuan,Pang Xiaotong,Liu Shilong,Misra R. D. K.,Sun Junhao
Currently, surface coatings on agricultural machinery are crucial for extending service life. However, achieving coating strength and toughness remains a challenge. In this paper, two types of high-hardness iron-based coatings, referred as S1 and S2, were prepared by modulating the Mo/V ratio in the Fe-C-V-Mo-B system, and their microstructural evolution and property changes were investigated. The results show that the S1 coating primarily consist of martensitic matrix, spherical VC, blocky Mo 2 B, and a small amount of skeleton-like Mo 2 B. In contrast, the S2 coating consist of martensitic matrix, petal-like VC, and skeleton-like Mo 2 B. Compared with S1, the VC volume fraction in S2 increases by 6.5%, and the Mo 2 B volume fraction increases by 16.3%. The average microhardness of S1 and S2 coatings are 737 HV 0.5 and 954 HV 0.5 , respectively, indicating that the S2 coating exhibits a 22.7% higher microhardness compared with S1. The average friction coefficients of S1 and S2 coatings are 0.434 and 0.398, respectively. Furthermore, the wear loss of S2 coating is approximately half that of S1. The fracture toughness of S1 and S2 coatings are 51.9 MPa·m 1/2 and 51.7MPa·m 1/2 , respectively. Fracture analysis reveals that the skeleton-like eutectic structure in S2 can deflect cracks generated by impact, increase the length of propagation path, and improve the toughness of coating. It allows S2 coating to achieve high hardness and wear resistance, while maintaining toughness comparable to S1 coating. This study provides a theoretical basis for the design and development of iron-based coatings with high hardness, high abrasion resistance, and impact resistance for agricultural machinery.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE-POLAND
·
2020
·Vol. 38
·期 3
·502-507
·
IF 0.911
Meihua Hu,Ning Bi,Mingming Liu,Guangjin Gao,Shangsheng Li,Taichao Su
The improved TiB2 ceramics were obtained in sintering process at the pressure of 5.5 GPa and temperature of 1550 °C in presence of metallic Co powder. The effect of Co content (ranging from 0 wt.% to 10.0 wt.%) on the phase composition, density, microstructure, Vickers hardness and thermal conductivity of TiB2 ceramics was analyzed. A small amount of new phase Co2B has been created in the reaction of TiB2 and Co. The relative density of sintered TiB2 ceramics reached 98.1 %. When the mass fraction of Co increased, the porosity increased, while the hardness first increased and then decreased. The maximal Vickers hardness values were equal to 33.3 GPa or 28.2 GPa when the used load was of 4.9 N or 9.8 N, respectively. The highest reached value of thermal conductivity was 88.9 W˙m−1 ˙ K−1. The dense TiB2 ceramics with improved hardness and thermal conductivity were ascribed to the high pressure sintering method and Co sintering aid. High pressure sintering method provides a new way for the preparation of ceramics materials.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qiangqiang Wen,Yuwei Ma,Fenglong Zhang,Han Sun,Weixiang Shang,Qiang Wang,Jinxiao Bao
Herein, we report a kind of structural and functional integrated ceramic material with excellent mechanical and optical properties . A series of Er-doped Zr 6 Nb 2 O 17 ceramic samples were prepared by the high-temperature solid-phase method, which showed reversible photochromism from light curry to dark brown under the alternating action of 365 nm UV light and heat treatment at 350 °C. The photochromic process is fully reversible and has good cyclic stability with a maximum photochromic contrast of 20.1%. The fluorescence modulation behavior based on the photochromic reaction can effectively modulate the emission of Er 3+ , and the maximum fluorescence modulation ratio reaches 62%. The best Vickers hardness and fracture toughness values of the prepared Zr 6 Nb 2 O 17 : Er ceramics reached 15.88 GPa and 4.5 MPa m 1/2 respectively. The mechanisms of the observed photochromism, photoluminescence , and fluorescence modulation were studied systematically. This work is expected to provide significant guidance for the development of high-performance colored ceramic materials and broaden its market application field.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2021
·
IF 5.134
Jun Chen,Hao Yang,Chang-Ming Xu,Ji-Gui Cheng,Ying-Wei Lu
Zirconia microspheres with high sphericity and hardness were successfully massively produced through a cost-effective spray granulation method by using an optimized slurry with high solid content and low viscosity which was formulated with a mixed dispersant . The influence of slurry solid content, binder addition as well as drying temperature on the shape and size of the sintered microspheres were studied. Furthermore, the formation mechanism of different granulated particles was analyzed based on the illustrated migration processes in the ZrO 2 droplets with different contents of water and additives. Under the optimized conditions, the sintered ZrO 2 spheres with tetragonal phase exhibit high sphericity with highest nano-hardness of 9.5 GPa, indicating it is possible to be used in the engineering fields. Such spray granulation method could directly serve for the industrial production of zirconia and other ceramic materials since it is a stable process with high yield, good granulating quality and strong controllability.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）