JOURNAL OF MATERIALS RESEARCH
·
2024
·Vol. 39
·期 14
·2082-2094
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IF 2.7
Gao Chenyu,Deng Jikun,He Jiaxing,Wang Zechuan,Sheng Yuanyuan,Liu Junwu,Zhong Honghai,Tong Guoqing,Jiang Yang
A novel Cu/Ti 3 C 2 T X laminated composite foil was prepared using a combination of electroplating and electrophoretic deposition. The results indicate that the average thermal expansion coefficient of the Cu/ Ti 3 C 2 T X composite foil decreased by 11.26% compared to that of pure copper. Due to the high electron mobility of Ti 3 C 2 T X and the favorable Cu/ Ti 3 C 2 T X interface, the electrical conductivity of the Cu/ Ti 3 C 2 T X composite foil exceeded that of pure copper by 8.7%, reaching 6.2147 × 10 7 S·m −1 , and its thermal conductivity increased from 381.5 W/m·K to 423.5 W/m·K. The study revealed that a thinner, looser Ti 3 C 2 T X layer with fewer layers is more favorable for copper penetration and filling, enabling a continuous network-like structure and resulting in significantly improved thermal and electrical properties of the composite copper foil. These findings position the Cu/Ti 3 C 2 T X foil as a promising candidate for electronic encapsulation and super-conductivity. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Yang Leng,Yue Sun,Peixiao Sun,Miaojun Xu,Hongjian Zhang,Xiaoli Li,Bin Li
Thermal management materials are the solution to heat dissipation issues in electronic devices, which are considered vital to the device's reliability and lifetime. Therefore, it was of great significance to develop a new type of epoxy resin composites with flame retardant , thermal conductivity and toxicity reduction. Here, dendritic zinc oxide (D-ZnO) was designed and synthesized after annealing the metal-organic framework (MOF) precursor and then using it to fabricate a thermally conductive epoxy resin (EP) thermoset . The synthesized d -ZnO reached a high specific surface area of 40.389 m 2 g −1 , which is about 14 times higher than that of commercial ZnO (C-ZnO). Remarkably, the EP/D-ZnO thermosets reaches a thermal conductivity (TC) of 1.10 Wm −1 K −1 at a low filler loading of 10 wt%, which is more than 4.5 times more than pure EP. In the meantime, the TC of the d -ZnO composite was 120 % higher than that of the commercial ZnO composite at the same loading. The coefficient of thermal expansion (CTE) of EP/10wt% d -ZnO thermoset decreased by 68.6 ppm K −1 compared to pure EP. The excellent thermal diffusion performance could be attributed to the polarized interfaces of d -ZnO, which forms heat conduction pathways. Thus, with addition of functionalized d -ZnO, the peak CO production and peak CO 2 production were decreased from 0.036 gs −1 and 0.80 gs −1 for pure EP to 0.026 gs −1 and 0.50 gs −1 (EP/D-ZnO thermosets). The EP/D-ZnO thermosets reported by this strategy demonstrate great potential as next generation thermal management materials.
研究领域:
材料科学
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热管理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2017
·Vol. 101
·期 3
·1266-1278
·
IF 2.841
Lin Chen,YeHua Jiang,XiaoYu Chong,Jing Feng
Thermal barrier coatings (TBCs) are one of the most important materials in gas turbine to protect the high temperature components. RETa 3 O 9 compounds have a defect-perovskite structure, indicating that they have low thermal conductivity, which is the critical property of TBCs. Herein, dense RETa 3 O 9 bulk ceramics were fabricated via solid-state reaction. The crystal structure was characterized by X-ray diffraction (XRD) and Raman Spectroscope. Scanning electron microscope (SEM) was used to observe the microstructure. The thermophysical properties of RETa 3 O 9 were studied systematically, including specific heat, thermal diffusivity, thermal conductivity, thermal expansion coefficients, and high-temperature phase stability. The thermal conductivities of RETa 3 O 9 are very low (1.33-2.37 W/m·K, 373-1073 K), which are much lower than YSZ and La 2 Zr 2 O 7 ; and the thermal expansion coefficients range from 4.0 × 10 −6 K −1 to 10.2×10 −6 K −1 (1273 K), which is close to La 2 Zr 2 O 7 and YSZ. According to the differential scanning calorimetry (DSC) curve there is not phase transition at the test temperature. Due to the high melting point and excellent high-temperature phase stability with these oxides, RETa 3 O 9 ceramics were promising candidate materials for TBCs.
研究领域:
材料科学
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热物理
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2019
·
IF 0
Chao Qian,Tianwen Zhu,Weiwen Zheng,Runxin Bei,Siwei Liu,Dingshan Yu,Zhenguo Chi,Yi Zhang,Jiarui Xu
Surface hydroxylation was implemented on CaCu3Ti4O12 (CCTO) particles to improve their interface compatibility and dispersibility in polyimide matrix. The surface hydroxylated CCTO fillers (CCTO–OH) were obtained by treating the CCTO particles in the mixed solution of H2SO4 and H2O2. The experimental results showed that the CCTO–OH/polyimide (PI) composite films had higher dielectric permittivity and lower coefficient of thermal expansion (CTE) compared to those of the CCTO/PI composite films, which were mainly attributed to the good dispersion of CCTO–OH particles and the enhanced interfacial polarization between CCTO–OH particles and PI chains. Among these CCTO–OH/PI composite films, the composite film with 40 vol % CCTO–OH particle loading exhibited the highest dielectric permittivity (76.9, 102 Hz), and a low dielectric loss (0.2, 102 Hz) was maintained. The maximum discharge energy density of the CCTO–OH/PI composite film with 25 vol % CCTO–OH reached 1.31 J/cm3, which was almost twice that of pure PI (0.63 J/cm3). Further, the prepared CCTO–OH/PI composite films had excellent heat resistance and low CTE. The high-k property of the CCTO–OH/PI composites remained stable up to 300 °C, which is probably the most heat-resistant dielectric material reported in the literature and is absolutely critical for the manufacture of electronic devices facing extreme conditions.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Wei Chen,Alicia C. Garofalo,Haining Geng,Yan Liu,Dongwen Wang,Qiu Li
Cesium-based geopolymer is more refractory than K + and Na + based geopolymers after the transformation to ceramic material, whose thermal resistance feature is highly appreciated by some industries, especially in the engineering field where the materials in some cases are exposed to environments with high temperatures. In this study, cesium-activated geopolymer composites (CsGPc), with 5–35 wt% cordierite reinforcements, were prepared and evaluated on the high temperature performance. When 35 wt% cordierite was added, the compressive strength increased by 72% compared to the reference plain CsGP. Residual compressive strength (after heating at 1400 °C) of CsGPc with 35 wt% cordierite increased by 106% compared to the specimen before the thermal exposure . After thermal exposure up to 1400 °C, the geopolymer matrix was transformed into a pollucite-based ceramic composite. Amorphous phases in CsGPc gradually crystallized to form pollucite as the main phase with cordierite as secondary phase. The microstructure of CsGPc and the obtained ceramics showed a clear sintering process and crystallization of pollucite. Shrinkage was reduced and the coefficient of thermal expansion (CTE) varied from 4.50 to 1.89 × 10 −6 K −1 with the cordierite inclusion. The performance of obtained ceramic composites was superior compared to the initial CsGPc, which would be excellent for heat resistance applications.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-11
·
IF 2.8
Feng Jingmin,Zhang Yajuan,Lu Yang,Shan Yiting,Guo Xiang,Zhou Hongqing
In this study, CaO–B 2 O 3 –SiO 2 (CBS) glass–ceramics were prepared and compounded with different contents of ZrSiO 4 . The sintering behavior, phase composition, microstructure, dielectric properties, thermal properties, and mechanical properties of this CBS glass–ceramic composite ZrSiO 4 ceramic system were investigated. The results show that CBS glass–ceramic can be sintered densely at 750 °C. However, the crystallinity is unexpectedly low and the dielectric properties are greatly damaged. Surprisingly, the addition of ZrSiO 4 improved the dielectric constant of the composites and achieved a dielectric adjustable in the range of 6.0–7.8. When the composite was sintered at 830 °C for 15 min with 35% ZrSiO 4 addition, the bulk density of the composite increased to 2.93 g/cm 3 . The dielectric constant measured at a high frequency of 13 GHz was 6.93 and the dielectric loss of 1.66 × 10 –3 . Accordingly, the addition of ZrSiO 4 reduced the thermal expansion coefficient of the composite to 6.1 ppm/°C and increased the flexural strength of the composite to 248 MPa.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yingxin Li,Wei Qian,Yinqun Hua,Yunxia Ye,Fengze Dai,Jie Cai
Thermal barrier coatings with excellent thermal performance and corrosion resistance are essential for improving the performance of aero-engines. In this paper, (Y 3-x Yb x )(Al 5-x Sc x )O 12 (x = 0, 0.1, 0.2, 0.3) thermal barrier coating materials were synthesized by a combination of sol-gel method and ball milling refinement method. The thermal properties of the (Y 3-x Yb x )(Al 5-x Sc x )O 12 ceramics were significantly improved by increasing Yb and Sc doping content. Among designed ceramics, (Y 2.8 Yb 0.2 )(Al 4.8 Sc 0.2 )O 12 (YS-YAG) showed the lowest thermal conductivity (1.58 Wm −1 K −1 , at 800 °C) and the highest thermal expansion coefficient (10.7 × 10 −6 K −1 , at 1000 °C). In addition, calcium-magnesium- aluminum -silicate (CMAS) corrosion resistance of YS-YAG was further investigated. It was observed that YS-YAG ceramic effectively prevented CMAS corrosion due to its chemical inertness to CMAS as well as its unique and complex structure. Due to the excellent thermal properties and CMAS corrosion resistance, YS-YAG is considered to be prospective material for thermal barrier coatings.
研究领域:
材料科学
·
航空工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 21
·期 2
·829-843
·
IF 2.1
Yang Yang,Jiaqi Yan,Shujia Cheng,Gang Liu,Bensong Chen,Kang Zheng,Lin Chen,Xingyou Tian
Cordierite ceramic is usually used for diesel particulate filter owing to its excellent low thermal expansion coefficient and high thermal shock resistance properties. However, the co-exited intermediate spinel phase can deteriorate the thermal and mechanical performances of cordierite ceramic product, because the spinel phase has much higher thermal expansion coefficient comparing to that of cordierite. In this study, two methods are utilized to reduce the spinel impurity in the cordierite ceramic. On the one hand, rational reaction resources were introduced to decrease spinel production. The formation of intermediate spinel phase is systematically researched by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman characterizations and the results clarified the preference of path “Enstatite + Mullite → Cordierite” for less spinel production in comparison to path “Enstatite + Al 2 O 3 → Cordierite + Spinel.” Additionally, MgO was introduced as fluxing agent to promote liquid-phase sintering, thus facilitating the conversion of spinel. On the other hand, the sintering schedule was improved by introducing a holding temperature gradient to promote the diffusion of Si 4+ and further promote the conversion of spinel into cordierite. With these methods, the residual spinel phase is minimized, the resulting high-purity cordierite has a 47% reduction in the thermal expansion coefficient from 3.07 × 10 −6 /K to 1.63 × 10 −6 /K compared to the original cordierite sample.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 6
·066308
·
IF 1.449
Xie Hui,Yu Jiakang,Jiang Dapeng,Liu Jipeng
Graphite flakes (Gf) were coated with Cr7C3 by salt bathing coating, and the Cr7C3 coated Gf reinforced Al matrix composites were prepared by gas pressure infiltration. Surface morphology of uncoated and Cr7C3 coated Gf, the interfacial characteristics of Cr7C3 coated Gf/Al composites were observed by SEM. Surface of Cr7C3 coated Gf is smooth without defects, the Cr7C3 coating effectively improved the wettability. When volume fraction of Gf is below 50%, the experimental value of thermal conductivity (TC) is basically consistent with the calculated value of the EMA model. When volume fraction of Gf is over 50%, the growth of deviates from the EMA model curve. Coefficient of thermal expansion (CTE) of composite was predicted by Kerner model and Orientation Disc model, because Kerner model does not consider the anisotropy of Gf and inaccurately predict the change of CTE. However, the Orientation Disc model can predict the change of CTE better, but there is certainly deviation.
研究领域:
材料科学
·
热物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2020
·Vol. 35
·期 16
·2230-2238
·
IF 2.502
Zhou Ying,Gan Guoyou,Ge Zhenhua,Feng Jing,Song Peng
HfO 2 –Sm 3 TaO 7 ceramics are prepared through a solid-state reaction method. The X-ray diffraction and structural refinement show that the phase structures of HfO 2 –Sm 3 TaO 7 ceramics are an ordered orthorhombic phase and the space groups are belonging to Ccmm . The degree of the structural disorder increases with increasing HfO 2 content. The solid solution mechanism reveals that Hf 4+ exists in the form of interstitial ions that cause crystal expansion when the doping content is less than 4 mol%. When the doping concentration of HfO 2 ≥ 4 mol%, the Hf 4+ ions can substitute an equal number of Sm 3+ and Ta 5+ ions. The phase transition of Sm 3 TaO 7 ceramics is removed with increasing HfO 2 content, and the 8 mol% HfO 2 –Sm 3 TaO 7 ceramics have a high thermal expansion coefficient of 10.2 × 10 −6 K −1 at 1200 °C. The 2 mol% HfO 2 –Sm 3 TaO 7 ceramics have the lowest thermal conductivity (1.03 W/m K at 900 °C), which is lower than previous research of the 7–8 YSZ. The outstanding thermophysical properties of HfO 2 –Sm 3 TaO 7 ceramics indicate that they are potential thermal-barrier coating materials.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2025
·
IF 2.2
Hao Xu,Lin Chen,Jiang Tian,Baihui Li,Luyang Zhang,Jiankun Wang,Jing Feng
High-entropy ceramics (HECs) are widely studied to boost the properties of various materials, based on the high-entropy effects and high disorders in ionic radius and atomic weights. To further optimize the properties of RETaO 4 (RE is rare-earth) as thermal barrier coatings (TBCs), a diatomic site high-entropy engineering is applied to increase their disorders, subsequently boosting their thermophysical properties. Four RETaO 4 HECs are designed and synthesized in this work, including (Gd 1 ∕ 5 Dy 1 ∕ 5 Ho 1 ∕ 5 Er 1 ∕ 5 Y 1 ∕ 5 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (5HECs-1), (Gd 1 ∕ 5 Dy 1 ∕ 5 Ho 1 ∕ 5 Er 1 ∕ 5 Yb 1 ∕ 5 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (5HECs-2), (Gd 1 ∕ 6 Dy 1 ∕ 6 Ho 1 ∕ 6 Er 1 ∕ 6 Yb 1 ∕ 6 Y 1 ∕ 6 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (6HECs-1), and (Gd 1 ∕ 6 Dy 1 ∕ 6 Ho 1 ∕ 6 Er 1 ∕ 6 Yb 1 ∕ 6 Lu 1 ∕ 6 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (6HECs-2). It shows that the thermal conductivity (1.41–1.59 W ⋅ m − 1 ⋅ K − 1 , 9 0 0 ∘ C) is reduced, while thermal expansion coefficients are improved ( TECs = 1 0 . 4 4 – 1 0 . 8 7 × 1 0 − 6 K − 1 at 1 4 0 0 ∘ C), which are better than their single-RE ceramics. Furthermore, Young’s modulus is proportional to their A -site ionic radius, and RETaO 4 HECs have higher modulus than single-RE RETaO 4 and RENbO 4 ceramics. Accordingly, the diatomic site high-entropy engineering is effective in boosting the thermophysical properties of RETaO 4 , and this strategy can be tried in various oxide ceramics.
研究领域:
材料科学
·
热物理工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhiqi Li,Zhihao Wang,Xiaofei Ma,Shenglan Xiang,Wei Wen
High-entropy rare-earth oxide ceramics offer great potential for thermal barrier coatings (TBCs) due to their tunable thermal expansion coefficients (TECs) and low thermal conductivities. In this study, a series of high-entropy rare-earth zirconia-ceria ceramics, (La 0.2 Nd 0.2 Gd 0.2 Ho 0.2 Y 0.2 ) 2 (Zr 1-x Ce x ) 2 O 7 (x = 0, 0.125, 0.25), were synthesized and characterized. The samples are denoted as 5RZ (x = 0), 5RZC1 (x = 0.125), and 5RZC2 (x = 0.25), where "5 R" refers to the five rare-earth elements, "Z" to Zr, and "C" to Ce. The research systematically investigates both the evolution of the phase structure and its influence on physical properties. The study found that the 5RZ sample with appropriate dual-phase ratios inhibits grain growth by clamping the grain boundaries, thus maintaining the fine grain structure. Owing to this property, 5RZ displays a low thermal conductivity of 1.730 W·m −1 ·K −1 at 800 °C. While in the fluorite phase dominated 5RZC1 and 5RZC2, the phonon scattering and defect scattering effects bring about a reduction in thermal conductivity to 2.216 W·m −1 ·K −1 , and 1.599 W·m −1 ·K −1 , respectively. Meanwhile, the TECs decrease gradually with the increase in the proportion of the fluorite phase, from 11.52 × 10 −6 K −1 for 5RZ to 11.10 × 10 −6 K −1 for 5RZC2. Additionally, 5RZ, 5RZC1, and 5RZC2 also exhibited higher hardness (10.52 ∼ 12.05 GPa) and fracture toughness (1.46 ∼ 1.50 MPa·m 1/2 ). The research results reveal the evolution and regulation mechanisms of the dual-phase structure, providing both theoretical basis and practical guidance for the tunable design of thermophysical and mechanical properties in TBCs.
研究领域:
材料科学
·
热力学工程
✓ 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）