JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 4
·905-913
·
IF 1.1
Pang Zengyuan,Gao Pengxiang,Meng Haonan,Cheng Zhenyu,Li Shen,Zhu Yanan
One-dimensional titanium dioxide (TiO 2 ) whiskers with controllable aspect ratios were synthesized by molten salt method adopting anatase TiO 2 nanoparticles as precursor, sodium chloride (NaCl) and dibasic sodium phosphate (Na 2 HPO 4 ) as medium. The particle size of TiO 2 nanoparticles and ratio of precursor and medium that can help to generate high aspect ratio TiO 2 whiskers were studied and selected. Light-colored antimony-doped tin oxide @ titanium dioxide (ATO@TiO 2 ) conductive whiskers were prepared by coating ATO on TiO 2 whiskers through coprecipitation then. Finally, the ATO@TiO 2 light-colored conductive whiskers were dispersed in polyacrylonitrile (PAN) to fabricate light-colored conductive fibers. The experimental results show that the ATO@TiO 2 whiskers exhibits ideal whiteness and conductivity with 65.5 Wb and 106 Ω·cm, respectively, and the resistivity of conductive fibers was 6.07×10 6 Ω·cm with 15wt% whisker content.
研究领域:
材料科学
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纳米技术
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无机合成
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高分子科学
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材料导电性能
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 3
·1740-1752
·
IF 2.1
Ling Pan,Pengju Chen,Peng Xiao,Ling He,Wei Zhou,Yang Li
The mullite and ytterbium disilicate (β-Yb 2 Si 2 O 7 ) powders as starting materials for the Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating are synthesized by a sol–gel method. The effect of SiC whiskers on the anti-oxidation properties of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating for C/SiC composites in the air environment is deeply studied. Results show that the formation temperature and complete transition temperature of mullite were 800–1000 and 1300°C, respectively. Yb 2 SiO 5 , α-Yb 2 Si 2 O 7 , and β-Yb 2 Si 2 O 7 were gradually formed between 800 and 1000°C, and Yb 2 SiO 5 and α-Yb 2 Si 2 O 7 were completely transformed into β-Yb 2 Si 2 O 7 at a temperature above 1200°C. The weight loss of Yb 2 Si 2 O 7 /(SiC w –mullite)/SiC tri-layer coating coated specimens was 0.15 × 10 −3 g cm −2 after 200 h oxidation at 1400°C, which is lower than that of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating (2.84 × 10 −3 g cm −2 ). The SiC whiskers in mullite middle coating can not only alleviate the coefficient of thermal expansion difference between mullite middle coating and β-Yb 2 Si 2 O 7 outer coating, but also improve the self-healing performance of the mullite middle coating owing to the self-healing aluminosilicate glass phase formed by the reaction between SiO 2 (oxidation of SiC whiskers) and mullite particles.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Dian Zhang,Xuan Liu,Yijun Liu
Conventional aluminum nitride (AlN) ceramics exhibited insufficient mechanical properties expected from their potential applications in the presence of dynamic loads and intensive stresses caused by thermal shock. In this study, the mechanical properties of AlN ceramics were enhanced by toughening them using AlN whiskers (AlN w ) via gel casting followed by low-temperature sintering at 1650°C. The addition of AlN w simultaneously increased the bending strength, toughness and thermal conductivity of the AlN ceramics. The maximum values of the bending strength, toughness, and thermal conductivity of 9.0 wt% AlN w /AlN were 303.92 MPa, 3.92 MPa·m 1/2 and 186.53 W·m −1 ·K −1 , respectively, which were higher than those of the AlN ceramics by 39.93%, 61.31% and, 15.61%, respectively. The AlN w in AlN w /AlN ceramics tightly bonded with the ceramic matrix, leading to two characteristic toughening mechanisms in the ceramics: crack pinning and deflection at irregular grain boundaries caused by doped whiskers, as well as bridging and stress relaxation caused by whiskers incorporated with the grains. Moreover, the one-dimensional morphology of AlN w can provide a channel for quick photon transport, thereby enhancing the thermal conductivity of AlN w /AlN.
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
Materials
·
2025
·Vol. 18
·期 4
·857
·
IF 3.2
Tiange Xue,Xinqing Su,Shixiang Yu,Meng Meng,Xinya Xu,Jinqi Xin,Jinjin Ran
In this work, a small amount of AlN whiskers (ranging from 2 wt.% to 8 wt.%) was incorporated into CaO-MgO-ZnO-B2O3-SiO2(CMZBS)–glass/Al2O3composites so as to obtain glass-ceramics with a thermally conductive network through sintering between 700 °C and 1000 °C. Special attention was given to the densification behavior, dielectric properties, and thermal conductivity of CMZBS/Al2O3/AlN–glass–ceramic composites with varying AlN whisker contents. According to the results, composites with desirable thermal, mechanical, and dielectrical properties were successfully fabricated. Notably, the composites containing 6 wt.% AlN whiskers, sintered at 800 °C, exhibited the most optimal comprehensive properties (dielectric constant of 7.06, dielectric loss of 383 × 10−5, thermal expansion coefficient of 6.40·10−6/K, flexural strength of 180 MPa, and thermal conductivity of 5.17 W/(m·K)). Given these attributes, this CMZBS/Al2O3/AlN composite holds great potential for applications in LTCC (low-temperature co-fired ceramic).
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 10
·3610
·
IF 3.4
Yinan Ren,Zhihua Tian,Yan Zhang,Fushuo Wu,Hao Xie,Qianqian Zhang,Peigen Zhang,Zhengming Sun
ZnO whiskers have many applications, such as in medical and photocatalysis fields. In this study, an unconventional preparation approach is reported, realizing the in-situ growth of ZnO whiskers on Ti2ZnC. The weak bonding between the layer of Ti6C-octahedron and the Zn-atom layers leads to the easy extraction of Zn atoms from Ti2ZnC lattice points, resulting in the formation of ZnO whiskers on the Ti2ZnC surface. This is the first time that ZnO whiskers have been found to grow in-situ on Ti2ZnC substrate. Further, this phenomenon is amplified when the size of the Ti2ZnC grains is mechanically reduced by ball-milling, which bodes a promising route to prepare ZnO in-situ on a large scale. Additionally, this finding can also help us better understand the stability of Ti2ZnC and the whiskering mechanism of MAX phases.Keywords:Ti2ZnC MAX phase;crystal growth;in-situ growth;ZnO whiskers
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Chengwan Yang,Xinyang Li,Jie Yu,Jieyan Yuan,Ming Li,Xiaoye Hu,Zhulin Huang,Yue Li
Zirconium boride (ZrB 2 ) whiskers hold significant potential for toughening ultra-high temperature ceramics (UHTCs). Yet, their fabrication remains challenging due to limited knowledge of the microstructure evolution. Herein, high-purity ZrB 2 whiskers were successfully prepared by electrospinning combined with carbothermal reduction. Specifically, a precursor solution containing Zr–O–C–B networks stabilized through hydrogen bonds with polyvinyl pyrrolidone was synthesized as a spinnable ZrB 2 precursor. High-purity ZrB 2 whiskers with a diameter of ca . 200 nm and a length of 5–10 µm were obtained by precise heat treatment of ZrB 2 precursor fibers. In this process, ZrO 2 grains formed initially and transformed into ZrB 2 grains through carbothermal reduction, which further converted into ZrB 2 whiskers through a solid-liquid-solid mechanism. To testify to the toughening effect for UHTCs, the ZrB 2 whiskers were added into ZrB 2 powders and followed by sintering. This strategic addition of 5 wt% ZrB 2 whiskers led to a 19% enhancement in the fracture toughness of ZrB 2 bulk. This study illuminated the preparation strategy and formation mechanism for ZrB 2 whiskers and their application for toughening UHTCs.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanzi Tang,Jincui Ren,Weixiang Yang,Yunuo Yang
TaC whiskers were prepared using the molten salt method with Ta 2 O 5 , activated carbon, NaCl/NaF, and nano Ni powders as raw materials. The study examined the effects of the ratios of these raw materials, reaction temperature, and reaction time on the phase composition and microstructure of the TaC whiskers, as well as their growth mechanisms. The results indicated that production and length-diameter ratio of the TaC whiskers initially increased with higher carbon content until a certain point, after which they began to decrease. The prepared TaC whiskers using NaCl as molten salt were acicular and had a low length-diameter ratio. The TaC whiskers prepared by NaF were quadrangular prism-shaped and had a high ratio of length to diameter. Insufficient molten salt resulted in poor diffusion and uneven distribution of the reactants, while an excessive amount led to increased whisker diameters and agglomeration of the TaC whiskers. When the content of Ni was low, there were not enough nucleation points for whisker growth, resulting in only a small quantity of TaC whiskers. Conversely, a high Ni concentration caused a decrease in the length-to-diameter ratio of the whiskers. As reaction temperature rose, both the production and length-diameter ratio of the TaC whiskers first rose and then fell. Prolonging reaction time could increase production and length-diameter ratio of the TaC whiskers. When the molar ratio of Ta:C:F:Ni was 1:4:1:25:0.10, with a reaction temperature of 1300 °C and a reaction time of 2 h, the TaC whiskers exhibited the highest production, purity and length-to-diameter ratio. These whiskers had with an average diameter of 0.8 μm and lengths spanning several microns. The TaC whiskers had a single crystal structure, with their growth direction aligned along the [001] crystal direction. The growth mechanisms of the TaC whiskers were controlled by both the vapor-liquid-solid and solid-liquid-solid mechanisms.
研究领域:
材料科学
·
晶体生长
✓ 已验证
产品关联
DOI
高影响因子
Journal of Asian Ceramic Societies
·
2020
·
IF 2.653
Mengmeng Yang,Jijia Li,Yiran Man,Zijun Peng,Xiaofang Zhang,Xudong Luo
A three-dimensional mullite-whiskers network ceramic with ultra-light weight and high-strength was obtained by the foaming gel-casting method with active mulllite powders and NH4F. Ultrafine active mullite powder was used as the raw material and SDS (sodium dodecyl sulfate) as a pore-forming agent. The effects of sintering temperature on the microstructure, flexural strength and thermal conductivity of the porous ceramics were systematically investigated. The mullite-whisker network porous ceramic has a fibrous-framework structure composed of interweaving mullite-whiskers. Because the pore-walls are composed of interlacing whiskers and the pores are filled with whiskers, the porous ceramics exhibited good mechanical properties and low thermal conductivity. The flexural strength of the obtained mullite-whisker porous ceramic sintered at 1500°C was up to 1.45 Mpa, while the porosity was as high as 89%. In addition, the thermal conductivity of the porous ceramic at room temperature was as low as 0.045 W/m⋅K.
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
CORROSION SCIENCE
·
2024
·
IF 7.4
Fuping Li,Wei Zheng,Feng Qin,Xu Hu,Wei Dang,Zhuoli Xu,Xinyuan Zhang,Kang Zhao,Yufei Tang
Polycarbosilane-derived ceramic coatings with superior oxidation resistance enhanced by SiC whisker fillers were prepared on titanium alloys via a dip coating method. The mass gain for coatings with whiskers is −0.22 and 1.725 mg/cm 2 after oxidation at 600 °C and 700 °C for 200 h, respectively, which is lower than the values for coatings without SiC whiskers and in other works. SiC whiskers not only compensate the shrinkage of PCS like particle-shaped fillers, but also inhibit the formation of cracks. In addition, SiC whiskers increase the viscosity of the glass phase and decrease its volatilization, thus improving the oxidation resistance.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lang Zhang,Haibo Wu,Zehua Liu,Yitian Yang,Huan Liu,Xishi Wu,Bingbing Pei,Jianshen Han,Zhengren Huang
The mullite-whisker-modified SiC porous ceramics were prepared by the oxide bonding method, using two additives (MoO 3 as a mineralizer and AlF 3 as a crystallization catalyst) to promote the growth of mullite whiskers. The microstructure and comprehensive properties of the sintered bodies were adjusted by controlling the sintering temperature and the additive content. The mullite whiskers obtained by controlling the sintering temperature and additives exhibit excellent microstructural characteristics (diameter: 0.1–0.5 μm, length: 3–6 μm, length-to-diameter ratio: 15–25). These formed mullite whiskers effectively intercepted particulate matter, and their interlocking structure provided higher strength to the sintered body. The resultant mullite-whisker-modified SiC porous ceramics demonstrated remarkable mechanical strength (43.8 ± 0.1 MPa) while maintaining high porosity (41.27 %) and excellent gas permeability (1.96 × 10 −14 m 2 ). After undergoing five thermal shock cycles at 850 °C, the material retained 92.69 % of its original strength and exhibited superior filtration efficiency of 99.6 % for PM2.5 particles.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Feng Mao,Xiaoxin Zhang,Qingzhi Yan
The application scope of advanced ceramics is significantly limited due to their inherent brittleness, making the enhancement of fracture toughness a critical area of research. Although the incorporation of SiC whiskers (SiCw) has been shown to effectively improve fracture toughness, a high content of whiskers complicates the densification process. Herein, we discovered that the addition of SiCw can react in-situ with sintering additives, enabling SiC ceramics to achieve densification while incorporating a substantial quantity of whiskers. We systematically investigated the effects of stacking faults in SiC whiskers on the densification and microstructure of ceramics. SiCw with stacking faults reacted with sintering additives, leading to improved densification and refined grains. In contrast, whiskers without stacking faults maintained a rod-like structure within the ceramic matrix, resulting in whisker debonding and pull-out. When 40 vol.% SiCw was added, the optimized flexural strength and fracture toughness can reach 885 MPa and 8.94 MPa·m 0.5 , respectively.
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
CELLULOSE
·
2021
·Vol. 29
·期 1
·213-222
·
IF 5.044
Fan Fangwei,Zhu Mengting,Fang Kaiyang,Cao Endi,Yang Yinzhi,Xie Jinpeng,Deng Zhongmin,Chen Yiren,Cao Xinwang
Cellulose nanowhiskers as one kind of renewable and biocompatible nanomaterials evoke much interest because of its versatility in various applications. Herein, the sisal cellulose nanowhiskers with ultrathin diameter of 5–10 nm, high crystallinity of 74% and C6 carboxylate groups converted from C6 primary hydroxyls were prepared via a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)/NaBr/NaClO system selective oxidization combined with mechanical homogenization. The effects of sodium hydroxide concentration in alkali pretreatment on the final sisal cellulose nanowhiskers were explored. It was found that with the increase of sodium hydroxide concentration, the sisal fiber crystalline type would change from cellulose I to cellulose II. The versatile sisal cellulose nanowhiskers would be particularly useful for applications in the nanocomposites as reinforcing phase, as well as in tissue engineering, filtration, pharmaceutical and optical industries as additives.
研究领域:
材料科学
·
生物材料学
✓ 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）