JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Keqiang Zhang,Kai Wei,Jiaxin Chen,Bo Liang,Daining Fang,Rujie He
Ceramics and their structures with tunable thermal expansion are deemed necessary to develop. In this study, multi-ceramic structures with tunable thermal expansion, including negative thermal expansion (NTE), zero thermal expansion (ZTE), and positive thermal expansion (PTE), were developed for the first time. Firstly, multi-ceramic triangle structures with tunable thermal expansion were designed based on ZrO 2 and Al 2 O 3 ceramics. Then, multi-ceramic triangle structures were fabricated by using the stereolithography additive manufacturing technology. Functionally gradient ceramic (FGC) layers were applied for releasing the thermal mismatch stress among the structure. Finally, the thermal expansion behavior of the multi-ceramic triangle structures were characterized and analyzed by using a homemade thermal expansion testing system. The proposed design, fabrication and characterization methods of multi-ceramic structures with tunable thermal expansion are believed to promote the engineering application.
研究领域:
材料科学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Chen Li,Ke Liu,Dequan Jiang,Cheng Jin,Tianyao Pei,Ting Wen,Binbin Yue,Yonggang Wang
Negative thermal expansion (NTE) and zero thermal expansion (ZTE) properties are of great significance for the long-life stable operation of precision equipment. However, there are still existing challenges in finding new materials that exhibit NTE or ZTE over a wide temperature range. Here, we report negative, zero, and positive thermal expansion in NiAs-type, defective Cr1−δTe, containing three compounds: hexagonal CrTe, monoclinic Cr3Te4, and trigonal Cr5Te8. CrTe shows the NTE behavior from 280 to 340 K with the volume coefficient of thermal expansion αV = −27.6 × 10–6 K–1. Cr3Te4 shows the ZTE behavior over a wide temperature range of 180–320 K (αV = 0.16 × 10–6 K–1). And Cr5Te8 holds the PTE behavior over the whole temperature range (αV = 38.5 × 10–6 K–1). All of the samples show obvious anisotropic thermal expansion on heating. Combined with the magnetic measurements, it can be confirmed that the NTE and ZTE properties in ferromagnetic Cr1−δTe originate from the magnetovolume effect (MVE). Such NiAs-type, defective compounds with similar compositions but different structures provide a new perspective for tuning the NTE properties of materials and searching for new materials with ZTE over a wide temperature range.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Xiaolong Shi,Hongbo Zou,Lianjie Yuan,Benshuai Chen,Ziang Zhang,Bin Lin,Shuai Yan
Mineral castings are used in the fabrication of precision measurement and machining platforms due to their favorable material properties. However, their high resin contents result in high coefficients of thermal expansion (CTE) and wear rates. This study introduces a novel mineral casting material incorporating β-eucryptite, an additive with negative thermal expansion (NTE). The effects of varying β-eucryptite contents on the thermal expansion and tribological properties of the mineral casting were investigated. Results demonstrated that the addition of β-eucryptite reduced the CTE of the mineral casting by 42.21% and achieved a low thermal diffusivity (Dmin = 0.61 mm 2 /s). Additionally, it decreased the wear rate by 73.83%. The experiment verified the effect of thermal expansion on the wear performance of materials. By reducing the expansion caused by frictional heat, the variation in surface roughness at the contact interface was minimized, leading to a reduction in wear. Highlights The addition of β-eucryptite reduces the CTE by 42.21%. Thermal diffusivity of mineral castings is 96.87% lower than that of cast iron. The addition of β-eucryptite reduces the wear rate by 73.83%. Low coefficient of thermal expansion reduces the wear rate.
研究领域:
材料科学
·
热力学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
XinWei Shi,Hong Lian,XiaoSheng Yan,Ruiqiong Qi,Ning Yao,Tao Li
Negative thermal expansion Zr 2 WP 2 O 12 (ZWP) powder prepared by hydrothermal method was used as fillers to tailor the thermal expansion coefficient (TEC) of the polyimide (PI)-based composites. A series of PI-based composites containing different loading (0–40 wt% or 0–19.6 vol%) of ZWP powder were fabricated by the in-situ polymerization technique. Their structures and properties were characterized by Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), Impedance meter, Thermal mechanical analysis (TMA) and Thermogravimetric analysis (TGA). The additions of ZWP steadily reduced the TEC of the PI matrix at all loadings studied. A 40 wt% (19.6 vol%) ZWP loading gives a 32.5% (about 15 × 10 −6 /K) reduction of TEC. The thermal stability of the ZWP/PI composites can be enhanced with the increment of ZWP powder. The independence of the dielectric constant on frequency is improved by introduction of ZWP particles to PIs. The dielectric loss displays good stability, which indicates that the ZWP/PI composites show potential applications in microelectronic and aerospace industries .
研究领域:
材料科学
·
复合材料
·
热力学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Zhang Peixian,Qiao Yongqiang,Zhao Kaiyue,Wang Qingjie,Zhao Huan,Guo Juan,Liang Erjun,Sun Tao,Zhang Jiangwei,Gao Qilong
Due to the high structural flexibility and controllable thermal expansion, cubic double ReO 3 -type negative thermal expansion (NTE) fluorides provide a solution for solving the prominent phenomenon of thermal expansion mismatch between materials. However, the expensive raw materials and complex synthesis steps limit its practical application. In this work, we have designed a more advantageous method for the synthesis of NTE material CaZrF 6 , and it is expected to be generalized to the synthesis of other double ReO 3 -fluorides. Intriguingly, a new orthorhombic phase CaZrF 6 has been synthesized via this method in a lower temperature. Unlike the strong isotropic NTE of the cubic phase CaZrF 6 , the orthorhombic phase shows the strong anisotropic positive thermal expansion (PTE). The combined analysis of temperature-dependent X-ray diffraction (XRD), Raman spectra, and first-principles calculations shows that the low frequency phonon vibration mode with negative Grüneisen parameter in cubic CaZrF 6 are strongly correlated with the transverse thermal vibration of F atoms and dominates the NTE of the material.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Zhiping Zhang,Yuenan Wang,Yang Lei,Fang Zhang,Xiaobing Chen,Hongfei Liu
Negative thermally expanded (NTE) (KMg) x Sc 2-x (WO 4 ) 3 (0 = x ≤ 1.5) ceramics have been prepared via solid-state reaction. X-ray diffraction (XRD) analysis reveals that (KMg) x Sc 2-x (WO 4 ) 3 undergoes a composition-induced phase transition as the (KMg) 3+ -substitution content increases. For x = 0.25, both hexagonal (KMg) x Sc 2-x (WO 4 ) 3 and orthorhombic Sc 2 (WO 4 ) 3 coexisted in the sample. For 0.25 < x ≤ 1, a single-phase, hexagonal (KMg) x Sc 2-x (WO 4 ) 3 , was obtained. When x is further increased to 1.25, monoclinic MgWO 4 impurity was detected in the sample. Meanwhile, as x increases, the grain size of (KMg) x Sc 2-x (WO 4 ) 3 ceramics grows up. Hexagonal (KMg) x Sc 2-x (WO 4 ) 3 ceramics show high densification and strong NTE property. Thermomechanical analysis indicates that the linear coefficients of thermal expansion (CTEs) of hexagonal (KMg) x Sc 2-x (WO 4 ) 3 ceramics decrease from −7.48 × 10 −6 °C −1 to −14.06 × 10 −6 °C −1 with the increase of x. High-temperature XRD analysis reveals that hexagonal (KMg) 0.5 Sc 1.5 (WO 4 ) 3 show an anisotropic NTE. The intrinsic linear CTEs are α a = α b = −6.74 × 10 −6 °C −1 , α c = 11.03 × 10 −6 °C −1 and the volumetric CTE is α v = −2.52 × 10 −6 °C −1 .
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
热学性能
·
结构与物性
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Junqi Li,Feiyu Qin,Yiping Lv,Xin Yang,Tianhang Wu,Xiaoling Wang,Wenhui Xu,Nianjie Liu,Jun Wang,Lei Hu,Jun Sun,Xiangdong Ding
Thermal expansion mismatch among packing epoxy, silicon chip and copper microbump, generates severe thermal stress in 3D packaging and system in package . This inherent issue generally leads to warpage and interface crack of integrated circuit (IC). Furthermore, low thermal conductivity is equally disadvantageous to heat dissipation in electronic packing materials, especially for high power density IC. Consequently, the thermal expansion mismatch and low thermal conductivity concurrently result in the dilemma of IC and speed up structural failure. Conventionally, amorphous silica with the low thermal expansion is incorporated into the epoxy to design an epoxy molding compound in order to reduce the giant thermal expansion of epoxy. However, commercial epoxy/silica composites cannot effectively solve the critical issues of thermal expansion mismatch and low thermal conductivity. Here, the Cu 2 V 2 O 7 (CVO) with negative thermal expansion (NTE) was introduced into epoxy to design the unconventional Epoxy/CVO composites, which demonstrates suppressed thermal expansion and high thermal conductivity . When the mass fraction of CVO researches up to 60 %, the linear coefficient of thermal expansion of this composite decreases from 94.5 ppm·K ‐1 of epoxy down to a low value of 25.8 ppm·K ‐1 . Concurrently, this composite achieves a high thermal conductivity of 1.31 W·m ‐1 ·K ‐1 . Moreover, the resistivity, tensile strength , elastic modulus and thermal hardness are measured to be 9.3 × 10 10 Ω·m, 13.7 MPa, 7.4 MPa and 80.2 HD, respectively, close to the values of the ideal epoxy molding compound. This work develops an untraditional Epoxy/NTE composite and offers a systematic investigation of their thermal, mechanical and dielectric properties , which is highly helpful for the development of advanced electronic packaging materials.
研究领域:
材料科学
·
高分子化学
·
热力学
·
电子封装
·
功能复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Xudong Wang,Ke Chen,Ziqian Li,Haoming Ding,Yujie Song,Shiyu Du,Zhifang Chai,Hui Gu,Qing Huang
Herein, a series of chalcogen-containing MAX phases, Hf 2 (Se x S 1−x )C, were successfully synthesized, whose lattice parameter change follows the Vegard’s law. The average coefficient of thermal expansion (CTE) can be continuously tuned from 7.59 μK −1 to 9.93 μK −1 when the occupancy rate x of Se changes from 0 to 1. The substitution of Se for S effectively soften the crystal structures that is reflected by long average M-A bond in Se-alloying Hf 2 (Se x S 1−x )C. However, the CTEs along a and c axes in all Hf 2 (Se x S 1−x )C MAX phases are almost same which may be find application in thermal barrier coating (TBC) that isotropic volume change is highly demanding.
研究领域:
材料科学
·
热物理学
·
固体化学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 44
·期 3
·1849-1858
·
IF 3.531
Xiaotao Zhu,Zeming Fang,Ying Yi,Zeru Wang,Yeqiao Meng,Qianfa Liu,Ke Wang
The mismatch of coefficient of thermal expansion (CTE) of components has created numerous reliability issues in electronic packages. Incorporating inorganic fillers into polymer matrices has been proven to be an effective way to reduce the CTE, but properly balancing CTE with other key properties of the composites is still a challenge. In the current work, negative thermal expansion Zr 2 WP 2 O 12 (ZWP) particles were prepared by a high-temperature solid-phase synthesis method. Polyphenylene oxide (PPO)-based composites with different volume fractions (0, 10, 20, 30 vol%) of ZWP particles were prepared and their thermal expansion and dielectric properties were characterized. PPO/silica composites with the same volume fractions of silica were also prepared and characterized for comparison. With the content of filler increased from 0 to 30 vol%, the CTE of the PPO/ZWP composites reduced from 74.2 to 45.4 ppm/°C, which is more significant than that of the PPO/silica composites (48.0 ppm/°C with 30 vol% silica). Meanwhile, the dielectric loss of PPO/ZWP composites decreased significantly from 0.0024 (0 vol% ZWP) to 0.0018 (30 vol% ZWP) at 10 GHz, which is better than PPO/silica composites (0.0019 with 30 vol% Silica). The PPO/ZWP composites exhibit excellent comprehensive properties, which may be promising materials for high-frequency applications in electronic packaging fields.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chang Zhou,Yongxiao Zhou,Saiyue Liu,Lianyu Zhang,Peiyu Song,Qiang Zhang,Biyuan Ma,Gaohui Wu
Negative thermal expansion particles can compensate metal matrix composites to achieve near-zero thermal expansion materials. However, there are huge thermal residual mismatch stresses in the particles due to the thermal expansion mismatch between matrix and reinforcement. The use of hybrid reinforcement is required to solve the stress concentration problem. In this study, the hybrid Al matrix composites reinforced with ZrW 2 O 8 and SiC reinforcements (SiCp, SiCnw) were fabricated by the pressure infiltration process. The effect of SiC content on microstructure, phase composition, thermal expansion and mechanical properties were examined by a combination of XRD , SEM, thermal dilatometer and bending tests. The results showed that the high-pressure phase (γ-ZrW2O8) content of hybrid metal matrix composites decreased with increasing SiC fraction. Among them, the composites containing 61.7 vol%ZrW 2 O 8 and 3.3vol%SiCnw achieved the best performance with a bending strength of 100–150 MPa and a near-zero thermal expansion (2.0–3.0 ×10 –6 K −1 ) in a wide range of − 50–120 °C, which was attributed to the synergetic hybrid effects of SiCnw and ZrW 2 O 8 . This work opens up a new frontier for the design and preparation of lightweight zero-thermal expansion materials.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
Acta Geochimica
·
2023
·Vol. 42
·期 6
·988-997
·
IF 1.6
Song Jiamei,Fan Dawei,Huang Shijie,Zhang Shanrong,Wu Mengzeng,Chen Wei,Zhou Wenge
The unit-cell parameters and volumes of geikielite (MgTiO 3 ) and ilmenite (FeTiO 3 ) were investigated at high temperatures up to 700 K and ambient pressure, using in-situ angle-dispersive synchrotron X-ray diffraction. No phase transition was detected over the experimental temperature range. Using (Berman in J Petrol 29:445–522, 1988. 10.1093/petrology/29.2.445) equations to fit the temperature-volume data, the volumetric thermal expansion coefficients at ambient conditions ( α V 0 ) of MgTiO 3 and FeTiO 3 were obtained as follows: 2.55 (6) × 10 –5 K −1 and 2.82 (10) × 10 –5 K −1 , respectively. We infer that the larger effective ionic radius of Fe 2+ (VI) (0.78 Å) than that of Mg 2+ (VI) (0.72 Å) renders FeTiO 3 has a larger volumetric thermal expansivity than MgTiO 3 . Simultaneously, the refined axial thermal expansion coefficients under ambient conditions are α a 0 = 0.74 (3) × 10 –5 K −1 and α c 0 = 1.08 (5) × 10 –5 K −1 for the a -axis and c -axis of MgTiO 3 , respectively, and α a 0 = 0.95 (5) × 10 –5 K −1 and α c 0 = 0.92 (12) × 10 –5 K −1 for the a -axis and c -axis of FeTiO 3 , respectively. The axial thermal expansivity of MgTiO 3 is anisotropic, but that of FeTiO 3 is nearly isotropic. We infer that the main reason for the different axial thermal expansivity between MgTiO 3 and FeTiO 3 is that the thermal expansion mode of the Mg-O bond in MgTiO 3 is different from that of the Fe–O bonds in FeTiO 3 .
研究领域:
材料科学
·
矿物学
·
固体物理
·
X射线衍射
·
热性能
✓ 已验证
DOI
高影响因子
COMPOSITE STRUCTURES
·
2025
·
IF 7.1
Binghao Lang,Xiaoyao Xu,Heng Yang,Xuefeng Yao
In this paper, design and characterization of controllable near-zero thermal expansion graphene rubber composites are studied systematically. First, a novel design approach for near-zero thermal expansion materials is proposed, integrating centripetal-structured graphene aerogels (prepared via directional freezing to form radially aligned lamellae) with silicone rubber. Second, graphene rubber composites are prepared by combining silicone rubber with graphene aerogel through the surface attachment method, and the coefficient of thermal expansion of the resulting composite could be accurately controlled by precisely adjusting the mass ratio between the two components. Finally, the experimental results indicated that the axial coefficient of thermal expansion of the composite material within the temperature range of 20-100°C is as low as 3.1 × 10 −7 /°C, when the mass ratio of silicone rubber to graphene aerogel is set at 6:1, while the radial coefficient measures 8.9 × 10 −6 /°C, demonstrating near-zero expansion. The reversible compressive strain of this material reaches an impressive 99%; the maximum stress is 1.97 MPa, and its performance remains stable even after undergoing 200 cycles of compression. This study shows the composite material, with near-zero thermal expansion and excellent mechanical properties, is promising for precision engineering and intelligent devices.
研究领域:
材料科学
·
纳米技术
·
机械工程
·
高分子科学
✓ 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）