METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2021
·Vol. 52
·期 5
·3276-3287
·
IF 2.47
Li Shaolong,Che Yusi,Song Jianxun,Shu Yongchun,Xu Baoqiang,He Jilin,Yang Bin
A single-phase zirconium oxycarbide was successfully synthesized by carbothermal reduction route at 1600 °C for 8 hours under argon atmosphere using ZrO 2 and graphite powder as raw materials (the molar ratio of ZrO 2 to graphite is 1:2.6). Effects of temperature, reaction time and molar ratio of ZrO 2 to graphite on zirconium oxycarbide preparation were also investigated. The microstructure and composition of the products were characterized by X-ray diffraction, scanning electron microscopy, energy spectroscopy X-ray and ONH analyzer. The hot-pressed single-phase zirconium oxycarbide has good stability in molten NaCl–KCl. Subsequently, anodic dissolution of zirconium oxycarbide and the reduction mechanism of the dissolved zirconium ion in molten NaCl–KCl were investigated by a series of electrochemical technologies. The results show that the zirconium ion species dissolved in molten NaCl–KCl is Zr(II). Zr(II) is transferred from the anode to the cathode in the molten salt and is reduced to zirconium metal. Potentiostatic electrolysis at − 2.9 V was carried out using ZrC x O y as anode. CO gas was detected in the exhaust gas during the electrolysis, which can be explained as the combination of C and O atoms in ZrC x O y . The cathode deposit was detected to be zirconium metal. The results show that zirconium oxycarbide was a suitable anode material for the electrolytic synthesis of zirconium metal.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhixin Wang,Yaowu Wei,Huayun Sun,Junfeng Chen,Bingqiang Han
ZrC was synthesized using sol-gel-like methods and carbothermic reduction techniques, employing Zr(OPr n ) 4 and carbon black as raw materials and CaF 2 as catalyst. High-crystallinity ZrC were obtained after a 20-minute hold at 1550°C. The effects of CaF 2 content and heat treatment temperature on structural transformation of the precursor, phase evolution, microstructural evolution and elemental composition analysis, as well as to analyze the catalytic mechanism of CaF 2 were investigated. The results indicated that this method enables effective and uniform mixing of ZrO 2 and carbon black. Adding CaF 2 promoted the deoxygenation of ZrO 2 and ZrC x O 1-x to ZrC, reducing the initial formation temperature of ZrC to 1300°C. The carbothermal reaction was nearly complete at 1500°C, yielding a composition of ZrC 0.951 O 0.049 at 1600°C. Thermodynamic calculations showed that CaF 2 react with ZrO 2 to form an intermediate phase of ZrF 4 , altering the reaction mechanism and reducing the theoretical initial synthesis temperature of ZrC to 1000°C.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Mingyu Xiang,Jingjing Xie,Wei Ji,Hang Ping,Weimin Wang,Hao Wang,Jinyong Zhan,Yan Xiong,Zhengyi Fu
Zirconium carbide (ZrC 0.84 O 0.13 ) nanopowders were consolidated using plasma activated sintering with 0–8 wt% ZrH 2 as the sintering additive to improve the sinterability. Compared with pure ZrC sintering, ZrH 2 additive led to the higher sintering kinetics and lower sintering temperature . This improvement was attributed to the increased carbon-vacancy concentration in the non-stoichiometric ZrC in the presence of ZrH 2 additive during the sintering process. Fully dense and fine-grained ZrC ceramics (1.3 ± 0.2 μm) were achieved at 1650 °C with 6 wt.% ZrH 2 . The final product exhibited the Vicker’s hardness of 21.2 ± 1.0 GPa and fracture toughness of 2.2 ± 0.3 MPa m 1/2 .
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
·
2024
·
IF 5.1
Guocheng Ma,Huihui Zhang,Chengyu Wang,Haibo Wu,Ming Yuan,Xuejian Liu,Zhengren Huang
In this study, high-performance zirconium carbide (ZrC) ceramics prepared by gel-casting method were reported for the first time. A water-based slurry with 40 vol% solids was prepared using TMAH and PVP as dispersants, and the resulting green body had a flexural strength of 21.11 ± 1.84 MPa after curing, which was sufficient for machining. Dense ZrC ceramics (relative density >97 %) were obtained by sintering at 2000 °C under atmospheric pressure, and a 387 ± 23.21 MPa flexural strength and 15.48 ± 0.28 GPa hardness were achieved. This study offers a new strategy for preparing ZrC ceramics with complex structures.
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
JOM
·
2024
·
IF 2.1
Saleem Muhammad Farooq,Ashraf Ghulam Abbas,Javid Muhammad,Haleem Yasir A.,Haidry Azhar Ali,Farooq Sajid,Lei Ma,Bilal Muhammad,Habib Muhammad,Akhtar Muhammad Saeed,Khan Rashid,Wang Tianwu
Understanding the dielectric properties of materials in the THz frequency range is crucial for the advancement of THz devices. Despite their significance, the dielectric characteristics of zirconium carbide (ZrC) within this frequency range remain underexplored, in particular the impact of surface carbon and oxide layers typically found on carbide particles. While traditional studies mainly focus on particle size, this study emphasizes the pivotal role of particle morphology in determining dielectric properties. Milling was employed to increase the surface exposure of ZrC particles, which were initially covered with layers of carbon and oxides. The dielectric parameters, derived from experimental THz time-domain spectroscopy (THz-TDS) data, indicated that increased milling led to improved energy storage capabilities. This enhancement is attributed to increased electronic polarizability and charge disorder-induced ionic polarization due to the increased surface exposure. Furthermore, the dielectric properties displayed reduced dispersion after further milling attributed to the uniform particle sizes and shapes achieved through this process. Our findings underscore the critical influence of surface carbon and oxide layers on the dielectric properties of ZrC and similar carbide particles—an aspect often overlooked in studies that focus solely on particle size and shape, ignoring the distinct dielectric contributions of each surface layer.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Peng Yang,Fang Peng,Xiong Xiao,Jie Chen,Haidong Long,Ruiqi He,Wenjia Liang,Ling Ran,Peihong He
Pure polycrystalline zirconium carbide (ZrC) ceramics were fabricated using high-pressure and high-temperature (HPHT) methods, and a systematic and comprehensive study of their properties was conducted. ZrC ceramics sintered at 5.0 GPa pressure and 1300 °C displayed optimal properties, with a Vickers hardness of 27.4 GPa and an indentation fracture toughness of 4.3 MPa·m 1/2 , which are 29 % and 39 % higher than the reported experimental data, respectively. Additionally, they had an average grain size of approximately 425 ± 153 nm, a relative density near 98.5 %, a Young's modulus of 412 GPa and an oxidation onset temperature of 713 ℃. This study offers critical insights into the sintering of pure, polycrystalline and fine-grained ceramics and provides a preparation method for improving the mechanical properties of other new ultra-high temperature ceramics (UHTCs).
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2015
·Vol. 17
·期 12
·1066
·
IF 0.579
Zhuoming Xie,Rui Liu,Qianfeng Fang,Tao Zhang,Yan Jiang,Xianping Wang,Changsong Liu
W-(0.2, 0.5, 1.0)wt% ZrC alloys with a relative density above 97.5% were fabricated through the spark plasma sintering (SPS) method. The grain size of W-1.0wt% ZrC is about 2.7 μm, smaller than that of pure W and W-(0.2, 0.5)wt% ZrC. The results indicated that the W-ZrC alloys exhibit higher hardness at room temperature, higher tensile strength at high temperature, and a lower ductile to brittle transition temperature (DBTT) than pure W. The tensile strength and total elongation of W-0.5wt% ZrC alloy at 700 °C is 535 MPa and 24.8%, which are respectively 59% and 114% higher than those of pure W (337 MPa, 11.6%). The DBTT of W-(0.2, 0.5, 1.0)wt% ZrC materials is in the range of 500°C–600°C, which is about 100 °C lower than that of pure W. Based on microstructure analysis, the improved mechanical properties of the W-ZrC alloys were suggested to originate from the enhanced grain boundary cohesion by ZrC capturing the impurity oxygen in tungsten and nano-size ZrC dispersion strengthening.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Kezhi Li,Xuan Zhou,Zhigang Zhao,Chunyu Chen,Changcong Wang,Biyun Ren,Leilei Zhang
Zirconium carbide (ZrC) whiskers were successfully synthesized by a combination of microwave hydrothermal (MH) and carbothermal reduction . The precursors of ZrC whiskers were produced by MH, subsequently carbothermally reduced to ZrC whiskers at 1100–1600 °C in an Ar atmosphere. Effects of the reduction temperature and precursors with various carbon/zirconium (C/Zr) molar ratios on the synthesis of ZrC whiskers were investigated. The results showed that the carbothermal reduction occurred at 1100 °C, and terminated at a relatively low temperature (1400 °C). When the reduction temperature was 1500 °C and the C/Zr molar ratio was 5:1, the ZrC whiskers with the largest aspect ratio and the most uniform distribution were produced. The whiskers exhibited the diameters of 0.1–2 µm and the lengths of 5–30 µm. The synthesized ZrC whiskers with a single crystalline phase displayed cylindrical and pagoda-like morphologies. The growth of ZrC whiskers was considered to be governed by the Ostwald ripening and S-L-S mechanism.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Y. Jiang,J. Hou,P. Huang,J. Li,E.H. Wu,Z. Xu,Q.S. Liu,Zhuoming Xie,Qianfeng Fang
Hybrid tungsten composites reinforced with zirconium carbide (ZrC) nanoparticles and tungsten fibers were developed by the conventional powder metallurgy process (ball-mill mixing of powders and fibers followed by spark plasma sintering). The synergistic and mutual influences of the fibers and nanoparticles on tungsten were investigated in tensile behavior and fracture-energy tests. Aided by the ZrC nanoparticles, up to 30% of the fibers could be embedded in the tungsten matrix. The fracture energy was maximized by co-introducing 0.2 wt% ZrC particles with 20 wt% short tungsten fibers. The fracture-energy enhancement of the short fibers is contributed by pseudo-toughness from the fiber–matrix interface, inherent toughness from the fibers themselves, and grain refinement (by 50%) of the tungsten matrix. The fracture energy of the composite is very sensitive to the ZrC content, because the two-way action of ZrC weakens the pseudo-toughness of the interface energy.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Lijie Tan,Zhidan Zeng,Hongbo Lou,Fei Zhang,Xiehang Chen,Songyi Chen,Yuanyuan Xuan,Fang Peng,Qiaoshi Zeng
As a prototype refractory and hard transition-metal carbide, the stability of zirconium carbide (ZrC) under extreme conditions is critical for its applications. Despite the extensive theoretical studies, few experimental results are available until now. In this work, we carried out a comprehensive experimental study of ZrC in a large unexplored pressure–temperature region (up to ∼150 GPa and ∼2000 K) by combining in situ high-pressure and high-temperature synchrotron radiation X-ray diffraction with various ex situ characterization techniques. Our results demonstrate that ZrC (B1 phase) remains stable up to ∼154 GPa at room temperature or at ∼40 GPa up to 2000 K, rather than undergoing the predicted B1-to-B2 phase transition. However, under high pressure and temperature, ZrC is extremely active when water is present. It would react with even trace amount of absorbed water to form ZrO2 and CH4. Our results clarify the structural and chemical stability of ZrC at extreme conditions, which would guide the applications of ZrC and provide new experimental constraint for theoretical calculations.
研究领域:
材料科学
·
物理学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2018
·
IF 2.572
Yicheng Wu,Yannan He,Zhiqiang Yu,Xiaoyan Liu
The thermal conductive behavior of Zirconium diboride (ZrB 2 ) coated with different proportions nanoalumina (Al 2 O 3 ) in epoxy composites was investigated by the laser flash experimental and finite element analysis (FEA) methods. The coated ZrB 2 composite particles were categorized into the 3-1, 3-2, 3-3 and 3-4 systems, which corresponded to four different mass ratios of ZrB 2 particles to Al 2 O 3 particles, respectively. It could be found that the coated ZrB 2 composite particles were effective for increasing the thermal conductivity of the filled epoxy composites due to more effective formation of the conductive chain structure in the composites compared to the single-phase particles. In comparison, the system of 3-3 showed the most positive effect on improving the thermal conductive performance of epoxy composites. For composites with a 7 vol% of ZrB 2 /Al 2 O 3 composite particles of 3-3 system, its thermal conductivity was 0.65 W m −1 K −1 , increased by 20% and 79% relative to single-filled composites of ZrB 2 and Al 2 O 3 with same filled content, respectively. The predicted thermal conductive results of Al 2 O 3 coated ZrB 2 particles in epoxy matrix obtained by finite element analysis were in reasonable agreement with the experimental results.
研究领域:
材料科学
·
热物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2018
·Vol. 2018
·期 1
·1634814
·
IF 2.207
Lianbing Zhong,Guihong Geng,Yujin Wang,Feng Ye,Limeng Liu
A fully dense TaC ceramic was prepared by hot pressing using 10 mol% ZrC plus 5 mol% Cu as a sintering aid. Formation of (Ta, Zr)C solid solution (ss) by reaction between TaC and ZrC facilitated densification. Addition of Cu refined the microstructure and consequently improved flexural strength of the TaC ceramics. TEM investigation found ubiquitous precipitation of nanocrystallites at multigrain conjunctions. The nanocrystallites were (Ta, Zr)C solid solution with uniform dispersion in an oxygen-rich glassy matrix. Although formation of nanoprecipitates may not much affect the mechanical properties of the TaC ceramic, the structure suggested a new type of nanoceramic worth further research.
研究领域:
材料科学
·
陶瓷学
·
固态化学
·
显微结构分析
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）