JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Qingyi Kong,Sijia Huo,Lei Chen,Yujin Wang,Jiahu Ouyang,Yu Zhou
Fully dense (Zr, Ti)B 2 -(Zr, Ti)C-SiC ceramics were prepared by reactive hot-pressing using ZrB 2 , TiC, and SiC as the initial materials for the first time. Effects of SiC addition on the microstructure evolution and mechanical properties were reported. The in-situ reaction between ZrB 2 and TiC as well as the SiC addition leads to the grain refinement. Besides, elongated (Zr, Ti)B 2 plate-like grains are obtained due to the occurrence of a transient liquid phase, which leads to the crack deflection in the matrix effectively. Mechanical properties are improved significantly due to grain-refinement and solid solution strengthening, and plate-like grains toughening effects. The ZrB 2 -10 mol%TiC composite with 10 mol% SiC additional exhibits good comprehensive mechanical properties of the hardness of 20.2 GPa, the flexural strength of 803 MPa, and the fracture toughness of 5.7 MPa m 1/2 .
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shujie Yu,Xin Li,Bangwei Ye,Guomei He,Jiangxi Chen
To meet the demand of advanced space exploration technologies, ultra-high temperature ceramics (UHTCs) have emerged as advanced materials for applications under extreme conditions. In particular, TiC–TiB 2 –SiC ceramic nanocomposites synthesized using the polymer-derived ceramic approach stand out as promising UHTCs. However, the complex synthesis procedures and high material costs associated with some of the precursors limit their practical scalability. In this study, TiC–TiB 2 –SiC ceramic nanocomposites were successfully prepared from a newly developed single-source precursor (named TBS ) using tetrabutyl titanate (Ti(OBu) 4 ), phenylboronic acid (PhB(OH) 2 ), and diphenyl dimethoxysilane (Ph 2 Si(OMe) 2 ) as common and inexpensive starting materials. Notably, the use of Ph 2 Si(OMe) 2 instead of costly starting materials for the synthesis of SiC-based ceramics has been rarely reported. The structural evolution during the polymer-to-ceramic conversion was studied via Fourier transform infrared spectroscopy, and phase and chemical composition evolution were investigated using X-ray diffraction (XRD). In situ generated nanoscale TiC–TiB 2 –SiC multiphase ceramics were detected via XRD at annealing temperatures above 1300 °C. In the nanocomposites annealed at 1800 °C, the average grain sizes of TiC, TiB 2 , and β-SiC were 55, 35, and 63 nm, respectively. High-resolution transmission electron microscopy (HRTEM) analysis of the microstructures of the obtained ceramic nanocomposites further confirmed the formation of nanoscale TiC, TiB 2 , and β-SiC.
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高影响因子
JOM
·
2017
·Vol. 70
·期 2
·138-143
·
IF 1.86
Zheng Kai,Zou Xingli,Xie Xueliang,Lu Changyuan,Chen Chaoyi,Xu Qian,Lu Xionggang
This paper investigated the electrolytic production of Ti 5 Si 3 /TiC composites from TiO 2 /SiO 2 /C in molten CaCl 2 . The solid-oxide oxygen-ion-conducting membrane tube filled with carbon-saturated liquid tin was served as the anode, and the pressed spherical TiO 2 /SiO 2 /C pellet was used as the cathode. The electrochemical reduction process was carried out at 1273 K and 3.8 V. The characteristics of the obtained cathode products and the reaction mechanism of the electroreduction process were studied by a series of time-dependent electroreduction experiments. It was found that the electroreduction process generally proceeds through the following steps: TiO 2 /SiO 2 /C → Ti 2 O 3 , CaTiO 3 , Ca 2 SiO 4 , SiC → Ti 5 Si 3 , TiC. The morphology observation and the elemental distribution analysis indicate that the reaction routes for Ti 5 Si 3 and TiC products are independent during the electroreduction process.
研究领域:
材料科学
·
电化学
·
陶瓷与复合材料
·
冶金学
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DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Weiqiang Hu,Jun He,Zhenwen Yang,Jing Tan,Songhua Chen,Shaocun Liu,Zongqing Ma,Yongchang Liu
The little TiC was added into Mo alloys by facile ball milling and subsequent sintering. Interestingly, ultrafine Mo-TiC alloy (6.53 μm) possesses quasi-cleavage transgranular fracture morphology, which is differed from traditional intergranular fracture morphology of oxide-dispersion-strengthened molybdenum (ODS-Mo) alloy. The alloy interface with the lowest strength changes from Mo grain boundaries (GBs) to grain interior, hence the crack propagates along grain interior. For one thing, some C-deficient TiC (Ti 8 C 5 ) can adsorb adjacent impurity oxygen at sintering stage to generate in-situ TiO x , thereby purifying Mo matrix. For another thing, coherent interfaces between TiC/TiO x particles and Mo further strengthen Mo matrix. Moreover, a lot of TiC/TiO x particles within Mo grains could efficaciously accumulate dislocations and indirectly improve GBs strength. Compared to ball-milled Mo or ODS-Mo alloy reported in literatures, the sintered Mo-TiC alloys in present work possess a high hardness (468 HV 0.2 ), an excellent match of high strength (1287.3 MPa) and large ductility (18.1%).
研究领域:
材料科学
·
冶金学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yixin Guo,Sijia Huo,Qingyi Kong,Lei Chen,Yujin Wang,Xinghong Zhang,Yu Zhou
Monolithic ZrB 2 , ZrB 2 -SiC, ZrB 2 -TiC and ZrB 2 -SiC-TiC were fabricated by hot pressing. Contour maps depicting grain size and mechanical properties were generated on the ZrB 2 -SiC-TiC ternary diagram through experimental data and software fitting. These visual representations effectively establish the relationships between chemical composition and material properties, despite the similar high hardness of three main compounds. Notably, the average grain size of ZrB 2 -SiC-TiC is significantly reduced by an order of magnitude compared to monolithic ZrB 2 . Both strength and hardness exhibit a strong correlation with grain size, while the elastic modulus demonstrates insensitivity to microstructure changes. The evolution of toughness proves to be complex.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2026
·
IF 1.8
Meijun Yang,Yan Xiao,Zhimin Chang,Zhenhui Chen,Takashi Goto,Song Zhang,Rong Tu
Diamond/Cu composites are promising for thermal management but their poor wettability requires carbide coatings for interfacial modification. This work proposes a novel magnesiothermic reduction method for synthesizing TiC @diamond at low temperatures utilizing a MgCl2–KCl molten salt system with TiO2 as the Ti source. An ∼325 nm TiC coating forms on diamond at 750 °C for 2 hours without graphitization. Interfacial analysis shows a semi-coherent interface with specific crystallographic orientations ([110] TiC // [110] diamond, (1 − 1−1) TiC // (1 − 1−1) diamond). The TiC @diamond/Cu composite shows optimal performance: thermal conductivity (TC) of 689 W/(m · K), 63% International Annealed Copper Standard electrical conductivity and 98.55% relative density, representing increases of 280.66% in thermal conductivity, 90.91% in conductivity and 8.02% in relative density compared to uncoated composites. Its CTE (Coefficient of Thermal Expansion) at 300 °C drops from 17.98 × 10−6 to 6.92 × 10−6/K, a 61.5% relative reduction, significantly enhancing thermal dimensional stability.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Liuwei Zhao,Wenbin Qiu,Yixiang Sun,Longqing Chen,Hao Deng,Lei Yang,Xiaoman Shi,Jun Tang
Bismuth antimony telluride (BiSbTe) composites are the most studied thermoelectric materials around room temperature. However, the extension of commercial applications is mostly restricted by its inferior conversion efficiency and mechanical stability. In this work, we report that the introduction of nano-sized ceramic titanium carbide (nano-TiC) can achieve a high dimensionless figure of merit ( ZT ) value up to 1.3 at 400 K and an increment in hardness over 37.93% at room temperature in Bi 0.3 Sb 1.7 Te 3 (BST) composites. On one hand, nano-TiC creates BST/TiC interfaces so that total thermal conductivity is reduced. Meanwhile, the Seebeck coefficient increases due to the scattering of carriers through the TiC-driven energy filtering effect. On the other hand, the hardness increases substantially with the addition of TiC resulted from the pinning effect induced hardening by grain boundaries and secondary phases. The results indicate that nano-TiC dispersion into BST matrix is effective for the enhancement in both thermoelectric performance and mechanical properties, which is favorable to practical applications. Moreover, the method of introducing nano-sized ceramic materials can also be extended to other thermoelectric systems.
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DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2019
·
IF 2.547
Ji Wang,Kai Wang,Xueliang Pei,Mian Li,Qin Yuan,Yabin Zhu,Yitao Yang,Chonghong Zhang,Liu He,Shiyu Du,Zhifang Chai,Zhengren Huang,Qing Huang
Interphase failures of traditional chemical vapor infiltration (CVI) synthesized SiC composites can often be found under irradiation conditions. Exploring new interphases and the corresponding synthesized method to improve the composites performance in irradiation environments are therefore important. In this study, molten-salt method was introduced to fabricate well-distributed TiC/Ti 2 AlC coating on carbon fiber (C f ) fabric, and the coated C f fabric was subsequently used to synthesize SiC composites with layered carbides interphases via PIP process. SEM and TEM datum indicate that the interphases are well integrated with the carbon fibers and matrix. Irradiation behavior of the C f /SiC composite was then studied by a series doses of Si ion irradiation at 300 °C. SPM shows that the irradiation induced swelling of interphases and matrix increase with the increasing irradiation doses, while the carbon fibers shrink along the axial direction after the irradiation and the shrinkage of the fibers increases with the irradiation doses. TEM investigation shows that no cracking and debonding of the interphase were detected even after the highest irradiation dose (∼20 dpa). The microstructure of the interphase remains the same as the pristine sample. Above results might prove that the interphases synthesized by molten-salt method has a good resistance to irradiation induced debonding. This pioneering work shows a new approach to fabricate the interphases and explore new fiber/matrix interphase designs for fission/fusion applications.
研究领域:
材料科学
·
核能工程
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产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-12
·
IF 3.159
Liu Jingqi,Hu Ning,Liu Xuyang,Liu Yaolu,Lv Xuewei,Wei Liangxiao,Zheng Shoutao
Ti matrix composites reinforced with 1–5 wt% graphene oxide (GO) were prepared by hot-pressed sintering in argon atmosphere. The effect of sintering temperature on the microstructures and mechanical properties of the composite was also evaluated. The results show that TiC nanoparticles were formed in situ as interfacial products via the reaction between Ti and GO during sintering. With increases in GO content and sintering temperature, the amount of TiC increased, improving the mechanical properties of the composites. GO was also partly retained with a lamellar structure after sintering. The composite reinforced with 5 wt% GO exhibited a hardness of 457 HV, 48.4% higher than that of pure Ti at 1473 K. The Ti-2.5 wt% GO composite sintered at 1473 K achieved a maximum yield stress of 1294 MPa, which was 62.7 % higher than that of pure Ti. Further increasing the GO content to 5 wt% led to a slight decrease in yield stress owing to GO agglomeration. The fracture morphology of the composite reinforced with GO exhibited a quasi-cleavage fracture, whereas that of the pure Ti matrix showed a ductile fracture. The main strengthening mechanism included grain refinement, solution strengthening, and dispersion strengthening of TiC and GO.
研究领域:
材料科学
·
机械工程
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DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Zheng Yang Li,Li Bo Wang,Guo Cai Zhong,Sai Sai Li,Ai Guo Zhou
Titanium tin carbide (Ti2SnC) is a member a MAX phases, which are ternary carbides or nitrides with layered structure. Ti powders are normally used as Ti source to synthesize Ti2SnC. In this paper, TiH2, a relative cheaper Ti source, was used to synthesize Ti2SnC. Ti2SnC was synthesized from TiH2/Sn/TiC or TiH2/Sn/graphite powders by a tube furnace at different temperatures under Ar atmosphere. From the analysis of X-ray diffraction results, the lowest temperature to synthesize Ti2SnC was 1000 °C. Ti2SnC content increased with temperature, and high purity Ti2SnC was fabricated at 1200 °C. From scanning electron microscopy, as-synthesized Ti2SnC from TiH2/Sn/TiC was with plate-like structure. However, for Ti2SnC from graphite as carbon source, there was some stripe microstructure. Some large pores existed between the Ti2SnC particles. The existence of the pores make the mechanical properties of Ti2SnC block significantly reduced, its compressive strength was only 0.483 MPa or 0.35 MPa respectively for samples synthesized from TiC or graphite as carbon source. The low mechanical properties make the porous sample easy to be broken as powders.
研究领域:
材料科学
·
无机化学
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DOI
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Liuxiong Luo,Lin Su,Xuting Niu,Anyu Sun,Ouming Zhang,Tianyang Luan,Xinhui Cao,Shen Gong,Bing Liu
A computed in situ hetero-reaction map was developed to guide Pt-based alloy/carbide heterojunction design. • Semicoherent PtNiFeTi|TiC nano-heterojunctions were constructed on CNTs through microwave synthesis and annealing. • PtNiFeTi|TiC/CNT delivered 249 mV for OER and 25 mV for HER at 10 mA cm −2 in 1 M KOH. • An AEM water electrolyzer achieved 2.12 V at 1 A cm −2 and operated stably for ∼ 500 h. • Interfacial charge redistribution and d-band downshift account for the enhanced bifunctional activity and durability. Scalable green hydrogen production requires electrocatalysts that combine high activity with long-term stability at industrial current densities. Here, a computed in situ hetero-reaction map is proposed for efficient design of Pt-based multicomponent alloy/carbide nano-heterojunctions, built on descriptor-guided alloy screening and JMAK/Arrhenius thermodynamic-kinetic analysis. Guided by the map, strongly coupled PtNiFeTi|TiC/CNT heterojunctions are synthesized. In 1 M KOH at 25 °C, the catalyst delivers η 10 = 249 mV for OER (49.7 mV dec -1 ) and η 10 = 25 mV for HER (35.8 mV dec -1 ). In an anion-exchange membrane electrolyzer (60 °C, 1 M KOH), it achieves 2.12 V at 1 A cm −2 and operates stably for ∼ 500 h with only ∼ 0.26 V increase. Aberration-corrected Semicoherent interface between PtNiFeTi and TiC with an orientation relationship of PtNiFeTi [110] // TiC [110] is observed. DFT attributes the performance to interfacial charge redistribution and a downshifted alloy d-band center (−1.25 to −1.61 eV), optimizing key OER/HER intermediates. Overall, this work provides a practical route for rapid design and scalable fabrication of industrial-grade water-electrolysis catalysts. Data-guided in situ hetero-reaction mapping enables semicoherent PtNiFeTi|TiC nano-heterojunctions for durable AEM water electrolysis. Download: Download high-res image (210KB) Download: Download full-size image
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 4
·3596-3605
·
IF 2.986
Zhongren Zhou,Yingjie Zhang,Peng Dong,Yixin Hua,Qibo Zhang,Ding Wang,Jianguo Duan,Zhen Zhang
The molten salt electrolytic method for the preparation of titanium carbide and silicon carbide composites has been subjected to a systematic investigation by experimental analyses and thermodynamic calculations . It has been confirmed that the electrolysis of high titanium slag in the presence of mixed graphite powders generates intermediates CaTiO 3 , Ti 2 O 3 , TiO, Fe 3 Si and objective carbonous products TiC/SiC. It has been furthermore found that the deoxidization process depends critically on a number of process parameters, namely, electrolyte composition, graphitic regime, reaction temperature, cell voltage and reaction time. After careful optimization of these parameters, TiC/SiC nanocomposites with particle sizes of 10–174 nm has been produced by electrolysis of high titanium slag and graphite mixtures in molar ratio of 1:2 referred to Ti:C under 3.2 V at 900 °C for 6 h in 1 mol%CaO-CaCl 2 -NaCl molten salt and with particle sizes of 12 nm~207 nm in 1 mol%CaO-CaCl 2 electrolyte.
研究领域:
材料科学
·
电化学
·
陶瓷与复合材料
·
无机合成
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）