JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jinlu Han,Jing Mei,Dequan Huang,Kai Pan,Yuqian Zhang,Zhuang Xu,Fenghua Zheng,Juantao Jiang,Yahao Li,Youguo Huang,Hongqiang Wang,Qingyu Li
A high-temperature-resistance insulating layer with high thermal conductivity is the key component for fabricating the instant metal-based electric heating tube. However, it is still a challenge for materials to possess excellent high-temperature resistance, superior insulating property, and high thermal conductivity at the same time. Here, a novel SiO 2 bridged AlN/MSR composite based on methylphenyl silicone resin (MSR) and AlN filler was reported. MSR with a high thermal decomposition temperature of 452.0 °C and a high withstand voltage of 5.6 kV was first synthesized by adjusting the contents of alkyl and phenyl groups . The superior high-temperature resistant insulating property is 3.7 and 2.4 times higher than the national standard requirement of 1.5 kV and commercial silicone resin, respectively. The hydrogen bonds formed between SiO 2 , AlN, and MSR and the electrostatic adsorption between SiO 2 and AlN can remarkably improve the uniform dispersion of AlN in MSR and thus enhance the insulating property, thermal conductivity , and thermal stability. With the addition of 2 wt% SiO 2 and 50 wt% AlN, the SiO 2 -AlN/MSR composite exhibits an extremely high withstand voltage of 7.3 kV, a high thermal conductivity of 0.553 W·m −1 ·K −1 , and an enhanced decomposition temperature of 475 °C. The superior insulating property and thermal conductivity are 4.9 and 1.3 times higher than the national standard requirement and pure MSR, respectively. This novel composite shows great potential for application in the fields requiring integrated superior insulating property, high-temperature resistance, and high thermal conductivity.
研究领域:
材料科学
·
复合材料工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2022
·
IF 4.804
Chen Chao,Mo Peicheng,Chen Jiarong,Hu Xixi,Hu Qiaofan,Lin Feng,Wu Yi
Using TiN-Ti-AlN as the binder, polycrystalline cubic boron nitride (PCBN) composites containing Y 2 O 3 and not containing Y 2 O 3 were prepared under high temperature and ultra-high pressure conditions, respectively. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the phase composition, microstructure and surface crack morphology of the composite material. At the same time, the compactness, microhardness and bending strength of the composite material were tested. The research results show that the phase composition of PCBN sample is mainly composed of BN, TiB 2 , TiN, AlN and Y 2 O 3 at an ultra-high pressure of 5.5 GPa and a temperature of 1500 °C. With the increase of Y 2 O 3 content, the relative density of PCBN first increases and then decreases, and the changes in mechanical properties also tend to be similar. As the content of Y 2 O 3 increases, it can be seen that the peak intensity of the main peak of TiB 2 also increases, indicating that the addition of Y 2 O 3 promotes the reaction between cBN and Ti. When the Y 2 O 3 content is 3.6%, PCBN has the best comprehensive mechanical properties, with a microhardness of 34.56 GPa and a bending strength of 890 MPa.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
·
IF 5.7
Yulan Yu,Guanghui Feng,Yujun Jia,Hejun Li
In this work, AlN whisker-reinforced (Zr, Hf)O 2 coating was prepared on SiC coated carbon/carbon composites by sol-gel and plasma spraying methods. Its cyclic ablation resistance was evaluated using an oxyacetylene torch with a heat flux of 2.38 MW/m 2 . After ablation, the coating showed apparently decreased crack sizes and quantity as compared with the one without AlN whisker addition, pointing out its better crack tolerance. Moreover, the coating had a thinner oxidized region based on the linear ablation rate (−0.042 µm/s), greatly lower than that of pure oxide coating (−0.922 µm/s). After detailed observation and characterization, probable protection mechanism was proposed.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Xiang Hou,Hao Wang,Qun Yang,Yanxia Chen,Linjiang Chai,Bo Song,Ning Guo,Shengfeng Guo,Zhongwen Yao
An Al-containing ODS steel was coated with a composite Cr-AlN layer by pack-cementation treatment. Constituent phases and microstructures of the coating layer were carefully characterized. The results show that the Cr-layer is a Cr-Fe solid solution with {Cr,Fe} 2 N 1-x particles and Cr 2 C particles, while the AlN-layer is composed of AlN particles and α-Fe matrix. The formation of Cr 2 C and {Cr,Fe} 2 N 1-x particles in the Cr-layer is due to the drag effect of the strong carbide-forming element Cr on the carbon in ODS steel and nitridation reaction of NH 4 Cl and Cr, Fe, respectively. During high-temperature pack-cementation, N atoms in the air diffuse into the ODS steel substrate and react with Al in the steel under the catalytic action of yttria , resulting in the formation of the AlN particles. Due to the limited diffusion depth of N and the high nitrogen concentration in the surface layer, the density and size of AlN particles are distributed in a gradient. The particle size is small and high on the side of the Cr-layer, while the particles on the side near the substrate are coarse and low in density. The composite coating greatly improves the surface hardness and friction resistance of the ODS steel.
研究领域:
材料科学
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表面工程
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冶金学
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产品关联
DOI
高影响因子
ENERGY
·
2023
·
IF 9
Lin Qiu,Kening Yan,Yanhui Feng,Xianglei Liu
The low thermal conductivity and easy leakage of phase change materials are the shortcomings that hinder their further application for thermal energy storage . It is crucial how to properly match skeleton materials and phases to improve heat transfer in order to solve the above problem. Here, we systematically investigate the effects of nano additives on the phase change and thermal properties of bionic hierarchical porous aluminum nitride-polyethylene glycol (PEG/AlN) composites. Alumina (Al 2 O 3 ) nanoparticles were found to have the largest enhancement effect for the thermal conductivity of PEG (84% for 4 wt% addition) compared to silica , titanium dioxide, and boron nitride . For these additives, the thermal conductivity and stability of the nano additives-enhanced PEG increase with the increase of their mass fraction. After 100 heating/cooling cycles, the thermal response curve shows that the Al 2 O 3 -enhanced PEG can maintain the phase transition behavior, and the measured phase transition temperature agrees well with the differential scanning calorimeter results. The thermal conductivity of the PEG/AlN enhanced with 4 wt% Al 2 O 3 is 20.41 W/m·K, and the melting point and phase change enthalpy are 55.93 °C and 81.05 J/g. In addition to the great improvement in thermal response, the heat storage rate also increases by 36.10%.
研究领域:
材料科学
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热能工程
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能源存储
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Gaohong Wu,Xiangjia Sun,Yanrong Liang,Jiaying Zheng,Yulan Xie,Zhaoping Chen,Jian Xu,Weidong Xiang,Xiaojuan Liang
To address the thermal management challenge in phosphor-in-glass (PiG) materials for laser lighting due to low glass matrix thermal conductivity, this study developed YAG:Ce 3+ -Al 2 O 3 PiG composites reinforced with Al 2 O 3 particles, achieving a thermal conductivity of 78.6 W/(m·K). A TiO 2 reflective layer optimized for reflection and light conversion was introduced between the AlN substrate and PiG layer. Systematic optimization of Al 2 O 3 content and preparation conditions yielded YAG:Ce 3+ -Al 2 O 3 PiG composites with exceptional performance: maximum luminous flux (LF) of 2515 lm under blue laser excitation, saturation threshold (ST) of 27.57 W/mm 2 , and luminous efficiency (LE) of 174.7 lm/W. LF and ST increased by 184.5 % and 167.4 %, respectively, compared to non-Al 2 O 3 counterparts. The surface temperature of 9 wt% Al 2 O 3 PiG reached 363.85 K, 34.4 % lower than the working temperature of the sample without Al 2 O 3 addition. Stable light emission and high photothermal stability confirm its potential as a high-brightness laser lighting material.
研究领域:
材料科学
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光学工程
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热管理
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固态照明
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
·
IF 5.7
Shuquan Yang,Lan Zhang,Meihui Xiao,Lin Chen,Jun Sun,Jianjun Ding,Xiaoxiao Li,Yi Gong,Kang Zheng,Xian Zhang,Xingyou Tian
Microwave devices with reduced dielectric loss and electronic components with increased integration density necessitate the higher performance of electronic packaging materials. The h-BN/AlN/CaCO 3 -MgO-B 2 O 3 -SiO 2 -Li 2 CO 3 glass composites were prepared via tape-casting and then sintered by pressureless and hot-pressing, respectively. The thermal conductivity of pressureless sintered composite was increased to 6.55 W/(m·K) by incorporating 3 wt% h-BN, and the thermal expansion of 4.47 ppm/K was achieved along with low dielectric constant of 5.76 and dielectric loss of 7.02 × 10 −4 at 24 GHz. In contrast, the hot-pressing sintered composite containing 4 wt% h-BN exhibited higher thermal conductivity of 10.3 W/(m·K) and lower dielectric loss of 4.77 × 10 −4 . The microstructure characterization indicated the construction of heat conduction networks, and XRD analysis illustrated the formation of crystallization in the glass. Such low-temperature co-fired ceramic (LTCC) with high thermal conductivity and low dielectric loss would be a promising candidate for electronic packaging and 5G communication applications.
研究领域:
材料科学
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电子工程
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陶瓷工程
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通信技术
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 104
·102542-102548
·
IF 3.289
Guanglei Wu,Yiqun Wang,Kuikui Wang,Ailing Feng
Modified aluminum nitride particle/polystyrene (AlN/PS) composite was prepared by a powder processing technique. The thermal conductivities, dielectric and thermal properties of composites with different mass fraction of modified AlN were investigated. Compared to the pure PS, the thermally conductive properties of AlN/PS composites improved from 0.189 W (m−1 K−1) to 0.418 W (m−1 K−1) when the content of AlN was 25 wt%. The thermal stability of the AlN/PS composite was improved with the increasing addition of AlN. The dielectric constant and dielectric loss of the 25 wt% AlN/PS composite was 3.58 and 0.0036 at 106 Hz, respectively. The dielectric constant of the AlN/PS composite showed a very small variation with the range of the frequency from 102 Hz to 106 Hz. The tensile strengths of the AlN/PS composite increased with increasing filler content when it was no more than 5 wt%, and then decreased with the further increase of the filler content, whereas the elongations at break showed the similar trends. SEM analysis showed that AlN could pack tightly, and thermally conductive AlN–AlN channels could be generated with further addition of AlN. The thermal conductivity of the AlN/PS composite with the increase of AlN content tended to be higher at higher temperatures. The thermal conductivity of the AlN/PS composites at the same AlN content tended to be higher at higher temperatures. Several theoretical models were used in comparison with experimental data of the thermal conduction of the composites.
研究领域:
材料科学
·
热传导工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Hao Zhou,Ziyan Zhao,Hui Zhang,Jinjing Yang,Anle Sun,Xuejian Liu,Zhengren Huang,Yan Liu
To expand the application of SiC/SiC joints under extreme conditions, Nano-Infiltration and Transient Eutectic (NITE) joining technology with AlN-Y 2 O 3 as a sintering additive was successfully developed. The rheological properties of the slurry and the microstructure evolution of the joints were systematically characterized by rheometer, SEM, EDS, EBSD , and TEM , respectively. Both room-temperature and high-temperature flexural strength was measured to evaluate the mechanical properties of the joints. An immersion test with concentrated nitric acids was performed to evaluate the corrosion resistance of the joints. The defect-free joining layer was composed of a dense α-SiC phase, a small amount of YAG(Y 3 Al 5 O 12 ) distributed in the triangular grain boundary, and a Y-Al-O glass phase from AlN-Y 2 O 3 . The mechanism of NITE joining could be attributed to the incoherent growth of the newly generated α-SiC in the joining layer along the α-SiC substrate. The maximum room-temperature strength of the joints was 320.5 ± 37.6 MPa. When the test temperatures were 1000 °C, 1200 °C, and 1400 °C, the flexural strength reached 238.7 ± 33.1 MPa, 215.5 ± 52.5 MPa, and 166.9 ± 52.0 MPa, respectively. After immersing the joints in a concentrated HNO 3 for 168 h, the flexural strength was 173.3 ± 12.6 MPa. The joints' excellent mechanical properties and corrosion resistance reveal great application potential under extreme conditions.
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
·
2020
·
IF 3.83
Yang Wu,Ruiming Yin,Kai Xu,Jing Li
Hydrolyzed AlN in traditional raw materials is not suitable for aqueous gel casting using DMAA (N,N-dimethylacrylamide) gelling agents. Therefore, a new hydrolysis-resistant AlCN was studied to replace hydrolyzed AlN. By adding the low toxicity organic monomers DMAA and MBAM (methylenebisacrylamide), the rheological properties of the slurry obtained under different conditions and the solidification and sintering properties of Sialon ceramics were studied. The results show that the best rheological properties can be obtained when the ball milling time is between 8 and 10 h and when the dispersant dose is 2%. When the ratio of DMAA to MBAM is 14:1, the flexural strength of the green body reaches a maximum of 15.29 MPa. When the sintering temperature increases from 1600 °C to 1750 °C, the density, Vickers hardness and fracture toughness of the sintered body gradually increase, reaching 3.195 g/cm 3 , 1549 HV, and 9.29 MPa m 1/2 , respectively. The flexural strength of the sintered body first increases and then decreases, reaching a maximum of 415 MPa at 1650 °C and a minimum of 303 MPa at 1750 °C.
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
·
2020
·
IF 3.83
Qinzhao Sun,Pu Mao,Lixue Zhang,Jiping Wang,Yingying Zhao,Fang Kang
Dielectric composites with a high dielectric constant and electric breakdown strength are highly desired for the excellent energy storage behavior of the microelectronic and electric power systems. Sandwich-structured composites with an insulating layer can provide a pathway to improve the dielectric and energy storage performance, and in general, the fillers design and volume control of the insulating layer are very important. Herein, we present a novel designed sandwich-structured aluminum nitride/potassium niobate/poly(vinylidene fluoride) (AlN/KNbO 3 /PVDF) nanocomposites by the solution-casting and hot-pressing process. The effect of the introduction of an insulating phase AlN in the two outer layers and a different KNbO 3 volume fraction in the middle layer on the dielectric properties and energy storage behavior of the sandwich-structured composites were investigated in detail. The results demonstrate that dielectric constant, electric breakdown strength, energy storage density and discharged efficiency of the AlN/KNbO 3 /PVDF sandwich-structured composites are significantly enhanced. Moreover, a high energy density of 10.54 J/cm 3 and a superior discharged energy efficiency of 70% at the electric breakdown strength of 337 MV/m are achieved in the sandwich-structured nanocomposites with 1 vol% KNbO 3 in middle layer and with 1 vol% AlN in the outer layers, which are much higher than the conventional single-layered KNbO 3 /PVDF composites. It is indicated that the introduction of insulating layers in sandwich-structure composites can improve the electric breakdown strength and discharge efficiency, as confirmed by analyzing results of the finite element simulations. This work may provide an effective approach to develop excellent performance dielectric composites for electrical energy storage applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Peng Li,Tianyu Shi,Xiaodong Li,Jiakai Cao,Lei Yang,Zhanggui Hu,Gang He
Aluminum nitride (AlN) has emerged as a promising filler for the fabrication of highly thermally conductive polymer composites due to its intrinsic high thermal conductivity and electrical insulation. Herein, the effects of oxygen content in combustion synthesized AlN and subsequent surface modification on the thermal and electrical properties of polydimethylsiloxane (PDMS) based composites were investigated. It is demonstrated that the thermal conductivity of the composite is enhanced with decreasing oxygen content in the AlN filler. Further functionalization with 3-aminopropyltriethoxysilane (APTES) yields a notable improvement in thermal transport, reaching 1.76 Wm −1 K −1 . Moreover, employing a binary hybrid filler system comprising Al 2 O 3 and AlN enables a substantial synergistic enhancement, elevating the thermal conductivity up to 4.2 Wm −1 K −1 .
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DOI
高影响因子
危险品化学品经营许可证（带存储）