JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 4
·1147-1150
·
IF 2.787
Gaoming Zhu,Xiaohong Wang,Peizhong Feng,Zhangsheng Liu,Jinan Niu,Farid Akhtar
MoB and SiC particulate reinforced MoSi 2 matrix composites were synthesized in situ from Mo, Si, and B 4 C powder mixtures by self-propagating high-temperature synthesis (SHS). The SHS MoSi 2 –MoB–SiC products were vacuum hot-pressed (HPed) at 1400°C for 90 min to fabricate high-density (> 97.5% relative density) bulk composites. Microstructure refinement and improvements in the Vickers hardness and fracture toughness of the HPed composites were observed with increasing B 4 C content in the reaction mixture. The HPed composite of composition MoSi 2 –0.4MoB–0.1SiC exhibited grain size of 1–5 μm, Vickers hardness of 12.5 GPa, bending strength of 537 MPa, and fracture toughness of 3.8 MPa.m 1/2 . These excellent mechanical properties indicate that MoB and SiC particulate reinforced MoSi 2 composites could be promising candidates for structural applications.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2663-2673
·
IF 3.094
Boo-Hyun Choi,Dae-Su Kim,Ku-Tak Lee,Bum-Joo Kim,Jeong-Su Kang,Sahn Nahm
Hydrothermally synthesized ZnS nanopowders comprising small and large particles were used to synthesize ZnS ceramics. Small particles (200 nm) existed in the gaps between the large particles (0.7 μm) and assisted the densification of the ZnS ceramics. ZnS ceramics sintered at low temperatures (<1000°C) exhibited small grains with large grain-boundary areas that provided diffusion paths for carbon ions from the graphite mold, resulting in carbonate absorption bands. ZnS ceramics sintered at high temperatures (≥1000°C) for a long time (≥2.0 hours) exhibited a dense microstructure with very large grains (>500 μm). The ZnS liquid phase, which was formed at approximately 980°C, assisted the densification and grain growth of the ZnS ceramics. A 3.0-mm-thick ZnS ceramic sintered at 1000°C for 16 hours showed a high Knoop hardness (321 kgf/mm 2 ) and a high transmittance of 71% in the wavelength range 6.0-12 μm without carbonate absorption bands.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Ku-Tak Lee,Boo-Hyun Choi,Jong-Un Woo,Jeong-Su Kang,Jong-Hoo Paik,Byoung-Uck Chu,Sahn Nahm
ZnS nanopowders annealed at low temperatures (≤550 °C) have a pure cubic structure, while a small amount of hexagonal phase formed in specimens annealed at temperatures ≥700 °C. The particle sizes of the ZnS nanopowders increased with the annealing temperature. ZnS ceramics that were sintered using ZnS nanopowders annealed at low temperatures (≤550 °C) exhibited low transmittance, because of their porous microstructure. ZnS ceramics that were synthesized using ZnS powders annealed at high temperatures (≥800 °C) containing large agglomerated particles, also exhibited low transmittance, due to the presence of a liquid phase. A carbonate absorption band was found from the ZnS ceramics with small grains, because carbon ions diffused from the graphite mold into the ZnS ceramics during sintering, probably through the grain boundaries, and formed carbonates. A ZnS ceramic that was sintered at 1020 °C using the nanopowders annealed at 750 °C exhibited dense microstructure, with a large transmittance, 68%, in the wavelength range 6.0–12 μm.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2015
·
IF 1.858
Zhaobing Cai,Guo Jin,Xiufang Cui,Yang Li,Yang Fan,Jiahui Song
In this work, a NiCrCoTiV HEA was fabricated by vacuum hot-pressing sintering after planetary ball milling. The microstructure and phase composition were studied by experiment and thermodynamic simulation. The results show that some discrepancies are found between the calculated and experimental results, and the main difference is the existence of TiO phase. Experimental results indicate that, the alloy consists of a BCC phase, an FCC phase, an eta (η) phase, a TiO phase and Ni 2 V 3 intermetallic compounds , and BCC phase is enriched with Cr and V elements, FCC phase is enriched with Co, Ti and Ni and heavily depleted by V and Cr, and eta phase is enriched with Ni, Ti, and Co elements. The thermodynamic simulation results suggest that the solidification simulation predicts the composition of BCC phase, FCC phase and eta (η) phase very well, but can't predict the presence of Ni 2 V 3 intermetallic compounds. Without regard to the composition of each phase, the results of the simulated equilibrium phase diagram seem to be much closer to the experimental results.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 8
·3876-3892
·
IF 9.6
Chai Fei,Zhao Fei-Ping,Hu Zhan,Wen Shi-Yi,Samia Ben-Hammouda,Fu Ze-Lin,Lai Xin-Ting,Liang Yan-Jie,Min Xiao-Bo,Chai Li-Yuan
Arsenic materials have attracted great attention due to their unique properties. However, research concerning iron–arsenic (Fe–As) alloys is very scarce due to the volatility of As at low temperature and the high melting point of Fe. Herein, a new Fe–As alloy was obtained by mechanical alloying (MA) followed by vacuum hot-pressed sintering (VHPS). Moreover, a systematic study was carried out on the microstructural evolution, phase composition, leaching toxicity of As, and physical and mechanical properties of Fe–As alloys with varying weight fractions of As (20%, 25%, 30%, 35%, 45%, 55%, 65%, and 75%). The results showed that pre-alloyed metallic powders (PAMPs) have a fine grain size and specific super-saturated solid solution after MA, which could effectively improve the mechanical properties of Fe–As alloys by VHPS. A high density (> 7.350 g·cm −3 ), low toxicity, and excellent mechanical properties could be obtained for Fe–As alloys sintered via VHPS by adding an appropriate amount of As, which is more valuable than commercial Fe–As products. The Fe-25% As alloy with low toxicity and a relatively high density (7.635 g·cm −3 ) provides an ultra-high compressive strength (1989.19 MPa), while the Fe-65% As alloy owns the maximum Vickers hardness (HV 0.5 899.41). After leaching by the toxicity characteristic leaching procedure (TCLP), these alloys could still maintain good mechanical performance, and the strengthening mechanisms of Fe–As alloys before and after leaching were clarified. Changes in the grain size, microstructure, and phase distribution induced significant differences in the compressive strength and hardness. Graphical abstract
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dong Huang,Qianli Liu,Peng Zhang,Chong Ye,Fei Han,Hongbo Liu,Zhihai Feng,Shipeng Zhu,Zhen Fan,Jinshui Liu,Hao Wang
A two directional high thermal conductive carbon fiber reinforced aluminum matrix composite with low interface damage is prepared by a vacuum hot-pressure diffusion method using the mesophase-pitch-based carbon fiber (CF MP ) cloth as fast heat conduction channels. The fiber/matrix interface is composed of an amorphous gradient transition layer between aluminum matrix and CF MP rather than Al 4 C 3 interface phase , thus endowing the continuous heat conduction channels in the composite. The composites deliver the high thermal conductivity of 305.5 W∙m −1 ∙K −1 in the X (Y) direction and the low volume density of only 2.53 g∙cm −3 when the fiber volume fraction reaches 30 vol%. The high thermal conductivity of the composite is attributed to the highly oriented fast heat transfer effect of the CF MP , the isotropic heat transfer effect of the aluminum matrix and the low-damage CF MP /aluminum interface. This study opens a new avenue to design and select the high thermal conductivity and lightweight thermal management materials for the aerospace field.
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
JOM
·
2022
·Vol. 74
·期 5
·2094-2105
·
IF 2.597
Zhou Tao,Dai Jie,Xiao Zhu,Qiu Wen-Ting,Lei Qian,Liu Xinwei,Qin Liuxin,Ma Muzhi
Combining short-process reduction and vacuum hot pressing, copper matrix composites with the graphite volume fraction of 55% and 70% were prepared by cuprous oxide and spherical graphite (Cu 2 O-Gr composites). Transmission electron microscopic (TEM) results show that some graphite particles in Cu 2 O-Gr composites change from spherical to finer flocculent or acicular shape, and the interface between the matrix and graphite is partially coherent. The reaction enhances interface bonding and modifies the interface morphology of graphite, leading to the good mechanical performance of the composites. Compared with the Cu-Gr composites prepared by conventional hot pressing, the Cu 2 O-Gr composites present higher density and strength and lower friction coefficients and wear rates. In the current-carrying friction experiments, the wear rate of the Cu 2 O-55Gr is nearly 25% lower than that of the Cu-55Gr. The short-process reduction contributes to better self-lubricating behaviors of the Cu 2 O-Gr composites, reducing the adhesive wear and abrasion wear.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
·
2025
·
IF 7.5
Xiuqi Wang,Zheng Lian,Dashi Lu,Mingyu Li,Hongjun Ji
The application of nanoparticle sintering technology for third-generation semiconductor packaging is usually hindered by the difficulty in volatilization of organic vehicles, the nanoparticle (NP) agglomeration of its solder paste zone, and poor mechanical properties due to the inherent pores/cracks. In this work, these obstacles can be overcome using ultrasonic-spraying Cu NP film and vacuum thermal-pressure sintering. This work first controlled the ultrasonic spraying process parameters (power, flow, pressure) to achieve uniform and stable atomization effects yielding a homogeneous Cu NP film. The Cu NP film was further employed to realize Cu die-Cu substrate interconnection, and the microstructure and mechanical properties of the sintering joints was emphatically analyzed. Results demonstrate that near-monolayer fine Cu sintering structures are successfully produced. The sintering joints have good interfacial bonding ratio (∼ 94 %) and low porosity (∼ 1.6 %), resulting in shear strengths of up to 120.1 MPa. Even when sintering at 250 °C, the shear strength can reach 96.1 MPa. Because of the "contact activation effect" and the removal of interfacial cracks , these ultrasonic-spraying samples are stronger than printing sintering joints (with cracks) under the same sintering processes . We expect this approach to improve the performance of the sintering joints and broaden the application of Cu NP films, the microstructure of which less dependent on paste composition and sintering procedure (temperature, pressure, and time, etc.).
研究领域:
材料科学
·
纳米技术
·
半导体封装
·
连接工艺
·
电子制造
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yakun Chen,Xiang Zhang,Enzuo Liu,Chunnian He,Yajing Han,Qunying Li,Philip Nash,Naiqin Zhao
In this study, a Cu matrix composite is synthesized reinforced by an in-situ three-dimensional graphene network (3D-GN) grown through chemical vapor deposition (CVD). Nano Cu powders and polymethylmethacrylate (PMMA) are employed as matrix and carbon source respectively. PMMA is dispersed on Cu powders after ball-milling. During the CVD process , carbon atoms from pyrolyzed PMMA diffuse and precipitate on Cu powders. By inheriting the morphology of Cu powders, carbon atoms build a 3D-GN in-situ on Cu powders. A bulk 3D graphene/composite with 0.5 wt% graphene is obtained by vacuum hot-press sintering. The favorable interfaces that crucial to the achievement of exceptional mechanical properties of a bulk composite are verified by TEM and SEM characterizations. A yield strength and tensile strength of 290 MPa and 308 MPa respectively are achieved of the composite. The structure of 3D-GN is well preserved in the bulk composite. We demonstrate that the 3D-GN serves as an effective obstacle to the propagation of dislocations by TEM further.
研究领域:
材料科学
·
金属基复合材料
·
纳米材料
·
固态物理
·
力学性能分析
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Yuwen Feng,Xiaoliang An,Hang Jia,Yu Zhang,Yue Qiao,Xi Chen,Zhendong Zhang,Xigao Jian,Cheng Liu
Multiwalled carbon nanotubes (MWCNTs) have demonstrated considerable potential for enhancing the mechanical performance of carbon fiber-reinforced high-performance thermoplastic polymer (CFRHPTP) composite. However, due to their tendency to aggregate within the thermoplastic matrix, overall performance improvements are limited. In order to address these issues, MWCNTs grafted with poly(bisphthalazinone ether sulfone ketone) (PBPESK@MWCNTs) were prepared by a diazotization reaction and then introduced into carbon fiber reinforced PBPESK (CF/PBPESK) composite laminates by dispersion in resin solution, which was immersed by CF to prepare prepregs, followed by a vacuum hot-pressing process. The structural and morphological characterization of PBPESK@MWCNTs was performed by Fourier transform infrared spectroscopy, Raman and X-ray photoelectron spectroscopy spectra, scanning electron microscopy (SEM), and transmission electron microscopy. The storage modulus and glass transition temperature of CF/PBPESK composites have been improved to 146 GPa and 322°C, respectively. Furthermore, the flexural strength, flexural modulus, and interlaminar shear strength of PBPESK@MWCNTs/CF/PBPESK composite were increased by 42.3%, 44.6%, and 42.9%, up to 1696 MPa, 162 GPa, and 70 MPa, respectively. Finally, the mechanism of reinforcement of composites by the introduction of PBPESK@MWCNTs has been revealed by SEM. Overall, this study highlights the potential of high-performance thermoplastic polymer-grafted MWCNTs as a strategy to enhance the mechanical performance of CFRHPTP composites to meet the application requirements.
研究领域:
材料科学
·
纳米技术
·
聚合物复合材料
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Xiaozhen Wang,Kan Liu,Yishi Su,Xiaoshu Wang,He Cao,Andong Hua,Qiubao Ouyang,Di Zhang
Thermal management materials with high thermal conductivity (TC), adjustable coefficient of thermal expansion (CTE) and excellent mechanical properties have promising applications in the electronic packaging and high-power density equipment fields. In this work, we have developed a novel strategy for tungsten-copper coated graphite flakes and aluminum nitride nanoparticles reinforced copper matrix composites (GFs(W–Cu)/AlN/Cu composites) fabricated by vacuum hot-pressing sintering. Herein, tungsten-copper coated graphite flakes (GFs(W–Cu)) were prepared by impregnation reduction and ultrasonic-assisted electroless plating , in which W–Cu coating improved interfacial bonding and realized metallurgical-physical synergy. Meanwhile, the AlN nanoparticles reinforced Cu flakes (AlN/Cu) were prepared by high energy ball milling, where AlN nanoparticles were evenly dispersed in the Cu matrix and played the role of pinning boundary and refining grain. Effects of nano-AlN with different volume fractions on the mechanical and thermal properties of GFs(W–Cu)/AlN/Cu composites were studied as well. As for the mechanical properties, the in-plane, through-plane flexural strength and tensile strength of GFs(W–Cu)/1.5AlN/Cu composite reached 276.7 ± 4.5, 390.6 ± 4.5 and 136.1 ± 3.0 MPa respectively, which increased by 96.8%, 283.7% and 120.7% than those of the GFs(W–Cu)/Cu composites. In terms of the thermal properties, the in-plane TC of GFs(W–Cu)/1.5AlN/Cu composite is 617.8 ± 12 Wm −1 K −1 , while the through-plane CTE ranging 25–200 °C is 4.9 ± 0.2 ppmK -1 . In conclusion, the GFs(W–Cu)/AlN/Cu composites provide a huge potential for design and application in the thermal management materials.
研究领域:
材料科学
·
热管理
·
复合材料
·
机械工程
·
冶金学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）