WOOD SCIENCE AND TECHNOLOGY
·
2026
·Vol. 60
·期 6
·89
·
IF 3.2
He Jianmin,Bai Zhongyang,Cui Xinru,Pan Yuzhen,Hu Yingcheng
Wood, a sustainable building material, faces limitations due to its inherent low mechanical strength and flammability. This study develops a biodegradable, high-strength, and flame-retardant wood composite through a synergistic strategy combining sodium alginate-induced biomimetic mineralization of calcium carbonate with physical densification. The resulting material achieves a limiting oxygen index of 31.5%, meeting the standard for high-performance flame-retardant materials. Its specific modulus reaches 28.26 GPa·cm³·g⁻¹, surpassing that of aluminum. Notably, cone calorimetry analysis reveals a synergistic suppression of smoke production. Environmental evaluations confirm the composite retains excellent biodegradability and exhibits low ecotoxicity. Utilizing industry-compatible processes and low-cost raw materials, this approach offers a scalable and practical pathway for producing advanced bio-based construction materials.
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Zhipeng Zhu,Xiaoxue Song,Xiang Chi,Jingyao Zhao,Qiaofang Zhou,Antoni Sanchez‑Ferrer,Dengyun Tu,Wanli Cheng
Unilateral surface compression in wood presents notable benefits, including reduced wood volume loss and energy consumption, rendering a highly promising and extensive utilization. However, shortcomings in compressed wood arise due to unclear gas pressure, temperature, and moisture content distribution within the wood during hot pressing. In this paper, the temperature and pressure distribution were analyzed utilizing an optical fiber temperature and pressure measurement system within the wood during hot pressing. Moreover, the moisture content, stress and strain in each layer at the end of hot pressing were discussed extensively. The results showed that the wood surface layer (SL) and subsurface layer (SSL) maximum temperature values were similar even with different layer thicknesses. Under sealing conditions, SL and SSL temperatures were generally 6 ℃ to 7 ℃ higher compared to unsealing conditions. The gas pressure maximum value exhibited an opposite order, gradually transferring to the core layer (CL) and declining as the processing time extended. During compression treatment, moisture migrated from the hot end to the cold within the wood. The moisture content displayed significant differences between the middle and end parts of the wood under unsealed conditions, with the disparity becoming more pronounced further away from the hot end. The transition region of the compressed wood served as a stress concentration area, experiencing the highest levels of stress. The dense region followed with the second highest stress levels, while the un-densified region exhibited the least amount of stress. Under the same process parameters, the thickness had little influence on the distribution of dense layers.
研究领域:
木材科学
·
材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Fang Xu,Dainan Zhang,Gang Wang,Huaiwu Zhang,Yan Yang,Yulong Liao,Lichuan Jin,Yiheng Rao,Jie Li,Fei Xie,Gongwen Gan
NiCuZn ferrite ceramics with high permeability and low magnetic loss have great values in high frequency applications. Here, we synthesized uniform and compact NiCuZn ferrites with small grains (about 1.5 μm) at 875 ° C via adjusting additive amount of Nb 2 O 5 and Bi 2 O 3 . The influence of Bi 2 O 3 additives on the microstructure and magnetic properties of NiCuZn ferrite, especially for grain growth and grain size, have been investigated. SEM results indicated that Nb 2 O 5 can obviously suppress grain growth when a small amount of Bi 2 O 3 was added. Also, the liquid phase of Bi 2 O 3 only can promote movement of grain boundary and reduce porosities between grains. Thus, a NiCuZn ferrite with high permeability ( μ i ′ = 472.79), high saturation flux density ( B s = 0.313 T), high Q value (66.3) and low coercivity ( H c = 94.75 A/m) was obtained when 0.25 wt % Nb 2 O 5 -0.50 wt % Bi 2 O 3 was added. It is proved that improvement of compactness can enhance magnetic properties even though grain growth was suppressed. However, over much Bi 2 O 3 (more than 1.00 wt %) reduced the magnetic properties due to deterioration of grains uniformity and existence of non-magnetic Bi 2 O 3 liquid phase. Such a low temperature solid phase synthesis method (i.e., adding composite additive with different melting point oxide) should also facilitate preparation of other advanced ceramics for practical applications.
研究领域:
材料科学
·
磁学
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DOI
高影响因子
POWDER TECHNOLOGY
·
2025
·
IF 4.6
Peng-Cheng Cai,Bao-Jiang Ren,Xin-Wen Zhou,Guo-Hua Zhang,Kuo-Chih Chou
Tungsten and its alloys occupy a critical position in modern defense, nuclear energy, vacuum electronics, and lighting applications due to their unique and irreplaceable properties. However, the intrinsic brittleness, thermal shock brittleness, and recrystallization brittleness of tungsten significantly limit its application and development. To address the high brittleness and poor strength-toughness of tungsten, the present work aimed to first prepare La 2 O 3 dispersion-strengthened composite powders by spray drying‑hydrogen reduction process. Subsequently, highly dense ultrafine-grained dispersion-strengthened W alloys were fabricated via spark plasma sintering (SPS). It was indicated that La 2 O 3 exhibited a significant refining effect on the powder; however, excessive La 2 O 3 addition led to aggregation, promoting the chemical vapor transport (CVT) mechanism and ultimately causing powder coarsening. During the sintering process, the uneven distribution and aggregation of secondary phase particles diminished their grain refinement capability. The resulting nanostructured W-0.5La 2 O 3 (wt%) composite powder exhibited a grain size of 109 nm, while the W-0.5La 2 O 3 alloy possessed the highest Vickers hardness of 647.9 HV 0.2 . Furthermore, the reduction and densification mechanisms of composite powder were investigated in detail.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanhong Yu,Guifang Li,Changwan Sun,Jianquan Zhang,Li Yang,Yichun Zhou
In this paper, we propose an effective method for doping WC into Ta-Hf-C ceramics to significantly enhance their densification and mechanical properties. An increasing WC doping amount from 0 to 20 at.%, enhances the densification of Ta-Hf-C ceramics from 92.4 % to 99.1 %. This is mainly due to the fact that the doping of WC effectively removes the harmful oxygen impurities from the ceramics, thereby increasing their sintering activity. Furthermore, the doping of WC plays an active role in the mechanical properties of the ceramics. The Ta-Hf-C doped with 15 at.% WC has the highest value of 36.41 GPa for nano-hardness due to the solid solution strengthening mechanism, while the highest Vickers hardness (38.75 GPa) and fracture toughness (3.76 MPa m 1/2 ) appear in Ta-Hf-C doped with 20 at.% WC. The main toughness mechanism is W segregation at the grain boundary, enhancing grain boundary strength .
研究领域:
材料科学
·
力学
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产品关联
DOI
高影响因子
HOLZFORSCHUNG
·
2023
·Vol. 77
·期 3
·170-183
·
IF 2.4
Zhizun Gao,Wenjing Wang,Fanjun Yu,Yonggui Wang,Zefang Xiao,Yanjun Xie
Rubberwood was modified using a two-step process involving impregnation with maleated lignin (ML) followed by densification. The effects of ML modification and densification on the physical and mechanical properties of modified wood were studied. The successful preparation of ML was confirmed using Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. In addition, scanning electron microscopy was used to characterize the densified rubberwood structure, which featured fully compressed cell walls and cell lumina filled with ML. The rubberwood modification resulted in a more uniform structure and increased density compared to untreated wood. Further, water immersion and moisture absorption experiments revealed thickness swelling of only 27.7% and 20.9%, a reduction of nearly 76% and 55%, respectively, compared to the densified wood that was only impregnated with water. The ML modification can alleviate the embrittlement of wood caused by densification. The modulus of rupture and modulus of elasticity of ML-treated and densified wood improved by nearly 54% and 200%, respectively, compared to untreated wood. Therefore, the synergistic treatment strategy can contribute to the high-value utilization of low-quality rubberwood.
研究领域:
木材科学
·
材料科学
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DOI
高影响因子
Applied Materials Today
·
2026
·
IF 7
Zijun Yan,Yue Sun,Yurong Dai,Shuhui Wang,Guolong Chen,Yue Lin,Huanhua Wang,Hao-Chung Kuo,Zhong Chen,Tingzhu Wu
Atomic layer deposition (ALD) presents a promising avenue for improving the environmental stability of perovskite quantum dots (PQDs). However, standard ALD processes (120–200 °C) inevitably compromise the PQD lattice structure, while lower temperatures yield porous, non-protective films. To overcome this trade-off, we developed a sequential-temperature ALD strategy that synergizes low-temperature surface passivation with high-temperature densification. First, a low-temperature (65 °C) ALD stage deposits a surface modification layer around PQDs, which leverages energetic precursor molecules to selectively passivate surface/lattice defects, effectively suppressing non-radiative recombination within PQDs and boosting their luminescence efficiency. Crucially, this initial layer plays a pivotal role in preventing thermal degradation of the perovskite during subsequent processing and generates a hydroxyl‑rich surface. These reactive sites facilitate the second stage, a high-temperature (120 °C) ALD, to rapidly deposit a dense Al 2 O 3 protective barrier layer. Remarkably, this sequential process induces the formation of a chemically graded Pb–O–Al–O–Al 2 O 3 interfacial structure remediating defects within the initial layer, exhibiting intrinsic self-healing capability. The resulting CsPbBr 3 /Al 2 O 3 composite manifests exceptional environmental stability, particularly against moisture, representing one of the best performances reported to date for ALD-encapsulated bulk CsPbBr 3 films. Unlike complex hybrid encapsulation schemes, our streamlined, standalone ALD approach enables scalable PQD modification. White light-emitting diodes fabricated with these encapsulated PQDs demonstrate a wide color gamut (∼120% NTSC) and remarkable spectral stability. This work establishes a generalizable paradigm for ALD encapsulation of thermally sensitive materials.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yunjie Gou,Yating Zhao,Jing Zhang,Wang Sun,Jinshuo Qiao,Kening Sun,Zhenhua Wang
BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) has been widely adopted as the electrolyte for protonic ceramic fuel cells (PCFCs). However, the synthesis and densification process of BZCYYb is too complex, which has greatly hindered the application of PCFCs. In this work, for the first time, we synthesized and densified uniform BZCYYb electrolytes within one step via step-wise current reactive flash sintering (SCRFS). Direct current is applied to the BZCYYb oxide precursor, and the input electric energy is converted into Joule heat, so that the sample can achieve synthesis and densification within 10 min. Compared with reactive flash sintering (RFS), the step-wise current control in SCRFS restricts the heating rate to ensure a uniform microstructure. When the current limit is 1.2 A (160 mA mm −2 ), the relative density is as high as 93.9%, and the sample has good conductivity. Therefore, SCRFS provides a new approach for the manufacture of BZCYYb electrolytes, and has the potential to be applied to achieve one-step uniform synthesis and densification of various ceramics.
研究领域:
材料科学
·
能源工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2013
·
IF 1.858
Pingping Liu,Fang Peng,Fangming Liu,Haikuo Wang,Chao Xu,Qiming Wang,Xiaoling Zhou,Wenwen Yin,Shuai Yin,Yong Li,Duanwei He
In this work, we present a novel method to sinter tungsten bulk material under high pressure without any additives. The sintering temperatures were greatly reduced in our experiments. The sintered samples can achieve near-full densification (relative density of 99.5%), and have fracture toughness of about 50% higher than that from the traditional methods, without sacrificing hardness. Moreover, the grain sizes of the sintered samples maintained in the initio range. The sintering kinetics, microstructure evolutions, and relationships of mechanical properties versus pressure–temperature conditions were also discussed.
研究领域:
材料科学
·
力学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Mao chen,Fan Zhang,Hailong Wang,Gang Shao,Bingbing Fan,Rui Zhang,Hongxia Li,Yongqiang Chen
The dense h-BN/ZrO 2 (30 wt%) composites without additives were rapidly fabricated by spark plasma sintering . The relative density, apparent porosity, fracture toughness, flexural strength , phase composition and microstructure of h-BN/ZrO 2 composites were systematically investigated. Besides, the corrosion resistance of h-BN/ZrO 2 composites in molten steel was also studied in detail. Especially, the h-BN/ZrO 2 composites were sintered at 1800 °C exhibiting a relative density of 96.6% and the flexural strength of ≈ 157 MPa. The corrosion of h-BN/ZrO 2 composites was mainly due to the oxidative decomposition of BN, and the corrosion process was clarified by a parabolic law. The excellent corrosion resistance of the h-BN/ZrO 2 composites was attributed to ZrO 2 residual layer formed at the interface. The corrosion thickness of h-BN/ZrO 2 composites was only ∼116 µm even using the longest corrosion time (80 min). The composites could be a promising candidate material applied to fabricated thin strip continuous casting side sealing plates.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Chuanbin Wang,Yongxin Cheng,Sumeng Hu,Kejia Kang,Yuzhe Han,Xudan Zhang,Xiangping Dai,Guoqiang Luo
Tungsten (W)-based composites with 1 wt% SiC were consolidated via field assisted sintering (FAST). FAST was conducted at temperatures ranging from 1000 °C to 1700 °C with holding times of 1–10 min under a pressure of 50 MPa. The densification and grain growth mechanisms were investigated using a creep deformation model and the grain growth power law. Various densification and grain growth mechanisms corresponded to different effective stress exponents ( n ) and grain growth exponents ( p ). n is the stress exponent associated with the densification mechanism, and p is the grain growth exponent related to the grain growth mechanism. The densification process mainly occurred at 1000 °C–1400 °C, whereas grain growth mainly occurred at 1500 °C–1700 °C. The W-Si-C composites were densified primarily through particle rearrangement (when n is ∼1), intergranular diffusion (when n is ∼2), and the dislocation-climb mechanism (when n is 3.62). The activation energies were estimated to be 153.80 and 541.17 kJ/mol at the effective stress exponents ( n ) of 1 and 2, respectively. Furthermore, intergranular diffusion is speculated to cause grain growth. The sintering temperature considerably affected the microstructure of W-Si-C composites. The silicide formed at sintering temperatures of <1100 °C was WSi 2 , and it transformed into W 5 Si 3 with increasing sintering temperature.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhiyuan Wang,Ce Zheng,Hongru Jin,Yichun Bi,Shengkai Wang,Xiaoqiang Li
This study investigates the densification, mechanical properties, and irradiation response of NITE-SiC fabricated using two low-content quaternary sintering additive systems: AlN-Y 2 O 3 -CeO 2 -MgO (AN-SiC) and Al 2 O 3 -Y 2 O 3 -CeO 2 -MgO (AO-SiC). The incorporation of nitrogen significantly enhances densification by increasing liquid phase viscosity, thereby suppressing additive evaporation and enabling >99.5 % relative density. Multi-cation doping (Y, Ce, Mg, Al) into the Y 2 Si 2 O 7 intergranular phase reduces eutectic temperature and promotes homogeneous sintering. Under irradiation to 7–8 dpa at 550–750 °C, both systems exhibit exceptional stability, attributed to the highly ionic Y 2 Si 2 O 7 structure resisting amorphization and accommodating dopants without segregation. Damage remains dominated by intragranular defect evolution in SiC grains, while AN-SiC demonstrates reduced radiation hardening and enhanced modulus recovery, highlighting the synergistic role of nitrogen in improving sintering and radiation resistance for Gen-IV reactor applications.
研究领域:
材料科学
·
核材料
·
陶瓷工程
·
辐照效应
·
烧结技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）