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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 10
·51639
·
IF 3.125
Haixiang Hu,Yu Qiu,Zheng Lu,Chuxuan Tang,Hailin Yao,Ming Cheng
The logical coherence macro–micro experiments about the anti-swelling performance of polyetheramine-230 (PEA-230) on expansive natural soil are presented in this paper. Further, the expansion of the soil in the solution and water system is considered. Great significance in treating the expansive soil broadens the applied range of polyetheramine-230. The mechanism is assessed by X-ray diffraction (XRD) in the state of wet and dry montmorillonite (Mt), XRD of dry clay extracts from the soil, zeta potential measurement, thermogravimetric analysis, and scanning electron microscopy. The results prove the significant effect of controlling the expansion of expansive soil. PEA-230 strongly adsorbs on the surface of soil particles and intercalates into the layer structure. Further, the PEA-230/soil hybrids can be judged as usable engineering soil with low expansion characteristics. Additionally, the concentration of PEA-230 controls the treatment effect, and 1 wt% PEA-230 is a proper concentration to treat the expansive soil. In particular, PEA-230 has excellent characteristics such as small molecular weight, good water solubility, and good stability. Thus PEA-230 can be regarded as a great agent to treat in-situ expansive soil.
研究领域:
土木工程
·
材料科学
·
地质学
✓ 已验证
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
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yanxu Zhai,Lei Huang,Chengyou Wu,Luyao Jin
This study employs a co-calcination method, using Mg(OH) 2 and H 3 BO 3 to simulate the behavior of boron impurity (B) during the calcination of MgO expansive agent (MEA). The investigation included systematic monitoring of the characteristics and micro-morphologies of B-containing MEA (BMEA), the hydration process of cement pastes containing BMEA, and the compressive strength and expansion behavior of mortar specimens. The results indicate that, under the light-burned regime (LBR), B accelerates the hydration of MgO while delaying the hydration of cement, leading to reduced compressive strength, and enhanced expansion. Conversely, under the high-burned regime (HBR), B reduces the reactivity of MgO, thereby decreasing the expansion of the specimens during the first 35 days while increasing the expansion in the later stages. Through analyses of pore structure and micro-morphologies in BMEA-containing cement pastes, this study elucidates the differential impacts of BMEA on microstructural evolution under varying calcination temperatures, as well as the underlying mechanisms responsible for distinct expansion rates in specimens. These findings establish a theoretical foundation for the application of boron-containing magnesium slag in MEA production.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Aoliang Liu,Zhuo Gao,Guoshuai Cai,Jingjing Li,Chenchen Qi,Jiali Bian,Yunling Zou,Haijun Zhang,Mingchao Wang
The expandable graphite (EG)/silicone resin co -modified polyurethane-based intumescent flame retardant thermal-insulating coating was prepared with polyurethane as the matrix, ammonium polyphosphate (APP) serves as the acid supplier, pentaerythritol (PER) acts as the char precursor, and melamine (MEL) functions as the gas generator, EG as the synergist, and silicone resin as the modifier. The effects of EG and silicone resin on the flame-retardant thermal insulation properties, thermal reaction mechanism, and component-structure evolution of the coatings were comprehensively discussed. The addition of EG increased the amount of char generated and solved the problem of serious melting droplets in the char layer during the expansion process. The addition of silicone optimized the internal structure of the char layer and ensured its structural integrity and thermal stability. When the addition amounts of EG and silicone resin were 7.5 % and 10 %, respectively, the coating SP3–4 exhibited the best performance. The temperature on the reverse side of the substrate with SP3–4 coating was lowered to 174 °C, and the anti-ablation time was increased to >2 h. The limiting oxygen index (LOI) of SP3–4 was 30.5 %, while that of blank coating Z6 was 23.8 %. Compared to the blank Z6, SP3–4 exhibited a 91 % decrease in smoke generation rate and a 70.4 % reduction in total smoke production, and the char residue rate at 1200 °C was increased by 355 %, the Brunauer-Emmet-Teller (BET) surface area of the char residue was increased by 287.9 %, and the tensile strength was increased by 63.1 %.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiangfei He,Chao Peng,Lijuan Yue,Xiuli Han,Han Chen,Chunli Guo,Lichun Xu,Jianli Shao,Meiqing Guo
Due to its high reversible capacity, Fe 7 S 8 has emerged as a promising anode material for sodium-ion batteries (SIBs). However, its application is limited by slow reaction kinetics and significant volume expansion during the charging and discharging process, resulting in poor rate capacity and reduced cycling stability. To address these issues, a novel high-temperature gas-expansion method is proposed to uniformly incorporate Fe 7 S 8 nanoparticles into N and S co-doped porous carbon (Fe 7 S 8 @NSC). It effectively reduces the volume expansion of Fe 7 S 8 and improves its electron/ion conductivity. As a result, when used as an anode material in SIBs, Fe 7 S 8 @NSC demonstrates excellent rate performance, delivering a capacity of 500.0 mAh/g at a current density of 5 A/g. Additionally, it exhibits remarkable stability, maintaining 99.83 % of its capacity after 600 cycles at the same high current density.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
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
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Caili Dai,Chenglin Gu,Baoche Liu,Yahui Lyu,Xue Yao,Haonan He,Jichao Fang,Guang Zhao
Steam channeling is a commonly occurring phenomenon during steam flooding in heavy reservoirs. In this study, low-temperature expandable graphite was prepared to be employed as a steam plugging agent to resolve this problem. The preparation process was divided into two stages: (1) preoxidation and (2) deep oxidation and intercalation. The effects of the reagents and expansion temperature on the expansion capability were studied. An improved preparation formula for expandable graphite employed a mass ratio of graphite: H 2 O 2 :HClO 4 :KMnO 4 : acetic acid (HAc) as 1:2:6:0.5:1, and the expansion volume at 300 °C was 273 mL/g. Moreover, the initial expansion temperature was approximately 140 °C. In a water environment, the graphite particles demonstrated an expansion, which is less than that in a dry environment, and most layers maintained a good connection to ensure that the graphite sheets exhibited better anti-breaking strength. The Fourier transform infrared spectroscopy and X-ray diffraction analysis indicated that the intercalation reagents (HClO 4 and HAc) successfully entered the graphite layers, and the crystallinity of graphite decreased gradually during the reaction process. The oxidants (H 2 O 2 , KMnO 4 ) oxidized the edges of the graphite layers and slightly opened them, which provided the channels for the intercalation agents to enter the interlayer space. After expanding at 300 °C, a worm-like particle was formed. Through direct plugging, bridge plugging, and expansion capability, the low-temperature expandable graphite can control steam channeling. This study established a complete preparation technique of low-temperature expandable graphite that can be used for controlling steam channeling. This may serve as a reference for the preparation of steam plugging agents and an efficient development of heavy oil.
研究领域:
石油工程
·
材料科学
✓ 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
危险品化学品经营许可证（带存储）