MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Yu Mei Zhou,Feng Lin Zhang,Peng Cheng Li,Kun Bai,Shang Hua Wu
AlMgB14 is a very hard and brittle material which need be modified for utilizing as cutting tool materials. In present study, TiB2 and Ni3Al were used to strengthen and toughen AlMgB14 material. The microstructure of the AlMgB14-TiB2-Ni3Al composites was analysized by scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy (EDX) and an X-ray diffractometer (XRD). The hardness and fracture toughness of the AlMgB14-TiB2Ni3Al composites were also examined. The results showed that the major phases in AlMgB14-Ni3Al composites were TiB2, AlMgB14, MgAl2O4 , Ni3Al and NiAl. With the increasing of the amount of Ni3Al, more intergranular fractured features can be found in the fractured surface of the composites, the hardness and fracture toughness of the composites were both decreased comparing to the synthesised AlMgB14. The AlMgB14-TiB2-4wt.% Ni3Al composite has a hardness of 28.1 Gpa and a fracture toughness of 3.14 MPa·m1/2.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2024
·
IF 6.1
Qianglong He,Wenchao Guo,Yunwei Shi,Aiyang Wang,Weimin Wang,Zhengyi Fu
In this study, B 4 C–TiB 2 –graphite ceramic composites were prepared via reactive hot-pressing sintering using B 4 C and TiC as the raw materials. The reaction process, microstructure, and mechanical properties were investigated. The solid-phase reaction is a diffusion-controlled process, wherein the B atoms diffuse into TiC and react to form TiB. Thereafter, TiB 2 is generated with the entry of subsequent B atoms. A core–shell structure is formed, wherein TiB 2 particles are wrapped by layered graphite. The products TiB 2 and graphite inhibit the growth of B 4 C matrix grains, which are instrumental in fine grain strengthening. In addition, the novel TiB 2 –graphite-agglomerated structure significantly improves the fracture toughness of the ceramic composites through crack deflection, bridging, and branching toughening mechanisms. Therefore, the comprehensive properties of B 4 C–TiB 2 –graphite ceramic composites are better than those of pure B 4 C ceramics. Specifically, the fracture toughness is approximately 6.77 MPa m 1/2 , which is considerably higher than that of pure B 4 C ceramics (2.47 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
Materials
·
2025
·Vol. 18
·期 4
·744
·
IF 3.2
Ya-Long Wang,Guo-Hua Zhang
Submicron-sized TiB2powders (300 nm–1 μm) were prepared by the reaction of TiC, B4C, and Ca assisted by molten CaCl2. The optimal reaction procedure (1200 °C and 25 wt.% CaCl2+ 25 wt.% Ca) was obtained by exploring the effects of the boronization reaction temperature and the addition of an amount of CaCl2. It was found that the introduction of CaCl2not only promoted the reaction but also effectively inhibited the volatilization of excess Ca. Furthermore, SEM images of the products showed that the morphology and particle size of TiB2were inherited from the carbothermal reduction product TiC, which was dominated by the “template/growth” mechanism. The process of the boronization reaction was that B atoms migrated from B4C and replaced the C atoms in the lattice of TiC.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Xiaorong Zhang,Zhixiao Zhang,Weimin Wang,Xiaoliang Zhang,Jingbo Mu,Guangsuo Wang,Zhengyi Fu
High-performance B 4 C composites toughened by TiB 2 -SiC agglomerates were fabricated via reactive hot pressing with B 4 C, TiC and Si as raw materials. The TiB 2 -SiC composite serves as a composite toughening phase formed in the B 4 C matrix through an in situ reaction; its agglomerates are composed of interlocked TiB 2 and SiC, which can remarkably improve the toughness of the B 4 C composites. The Vickers hardness , flexural strength and fracture toughness of the B 4 C-TiB 2 -SiC composite reached 35.18 ± 0.45 GPa, 567 ± 14 MPa, and 6.38 ± 0.18 MPa m 1/2 respectively. The special toughening structure of the TiB 2 -SiC composite introduced into B 4 C ceramics was evaluated for the first time in this study.
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
Journal of the Australian Ceramic Society
·
2024
·
IF 1.8
Wang Xingguo,Li Xin,Chen Bin,Tang Jian,Chang Shilun,Xu Chen
The reaction mechanism of TiB 2 synthesized by carbothermal reduction is unclear due to a lack of thermodynamic research. In this work, the phase diagrams of TiO 2 -B 2 O 3 -C system were analyzed at a large temperature range (900–1800 °C), illustrating that Ti 4 O 7 , Ti 3 O 5 , and TiC were the main intermediate products. According to the Gibbs free energy minimum principle, the synthesis pathways of the main intermediate products and the target product TiB 2 were discussed, respectively. Based on the thermodynamic research, the reaction mechanism of TiO 2 -B 2 O 3 -C system was proposed and verified by experimental research at 900–1500 °C. X-ray-pure TiB 2 powder was synthesized at 1500 °C for 30 min and the possible reaction mechanism could be divided into three stages: TiO 2 (anatase)→TiO 2 (rutile)→Ti 3 O 5 , TiC →TiB 2 .
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
高影响因子
HIGH PRESSURE RESEARCH
·
2020
·
IF 1.315
Xiaonan Wang,Qiang Tao,Yang Han,Qiuyang Hu,Jiaen Cheng,Hongsheng Jia,Pinwen Zhu
Obtaining both high hardness and toughness is a challenge in B4C-nano-adhesive composites. Solving the inhomogeneous distribution of nano-adhesives in B4C and forming the chemical bonding at grain boundary is an effective method. Here, we reported that the uniform distribution of titanium diboride (TiB2)-reinforced B4C composites synthesized by high-pressure and high temperature (HPHT). It is found that HPHT sintering can effectively inhibit the grain growth and increase the relative density. Moreover, HPHT sintering can cross high reaction energy barrier and effectively promote the formation of chemical bonding at grain boundary between B4C and TiB2. The optimal hardness and toughness value reach 30.0 ± 0.9 GPa and 7.87 MPa·m1/2, respectively. The improvement of hardness and toughness in the final products are ascribed to the strengthening of nanoTiB2 connection of B4C boundary and intergranular fracture mechanism. This work suggests a new way to achieve the uniform distribution of nanoTiB2 in B4C and form the chemical bonding at grain boundary, which is of great significance to the further development of TiB2-reinforced B4C composites with excellent mechanical properties.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Zhang Xin,Zhang Xuelian,Ren Zhuanghe,Hu Jianjiang,Gao Mingxia,Pan Hongge,Liu Yongfeng
In this paper, we report amorphous-carbon-supported TiB2 nanoparticles having sizes of 2–4 nm (nano-TiB2@C) as highly active catalysts for hydrogen storage in NaAlH4. Nano-TiB2@C was synthesized by a simple calcination at 550°C with Cp2TiCl2 and MgB2 (molar ratio of 1:1) as precursors. The addition of 7 wt% nano-TiB2@C reduced the onset dehydrogenation temperature of NaAlH4 by 100 to 75°C. A practically available hydrogen capacity of 5.04 wt% could be desorbed at 140°C within 60 min, and completely hydrogenated at 100°C within 25 min under a hydrogen pressure of 100 bar. Notably, the hydrogen capacity was almost unchanged after 20 cycles, which shows the stable cyclability, considerably higher than those of structures catalyzed by Ti halides or TiO2. The stable catalytic function was closely related to the in-situ-formed Ti–Al alloy, which considerably facilitated the dissociation and recombination of H–H and Al–H bondings.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Zhuang Li,Cun You,Zhihui Li,Xuepeng Li,Guiqian Sun,Xinglin Wang,Qi Jia,Qiang Tao,Pinwen Zhu
Continuously strengthening the mechanical properties of ultra-high temperature ceramics (UHTCs) is the future requirement. However, the mechanical properties of classical UHTCs HfB2 and ZrB2 are not satisfactory among transition metal light elements (TMLEs) compounds. TiB2 has superior mechanical properties compared to both HfB2 and ZrB2, but has inherent brittleness and limited oxidation resistance. In this work, a low content of solution strengthening was used to fabricate dense samples of Tix(Hf/Zr)1-xB2 (THZ) under high pressure and high temperature (HPHT). Compared to pure TiB2, Ti0.94(Hf/Zr)0.06B2 exhibits a significant increase of 38.8 % in oxidation resistance temperature (950 ℃) while Ti0.91(Hf/Zr)0.09B2 shows a notable increase of 28 % in fracture toughness (5.8 MPa·m0.5). Synergistic effect of dual-atom solid-solution results in local inner stress and anomalous lattice contraction. Finally, lattice-contraction was achieved to resist the oxygen invasion, thereby elevating the oxidation resistance threshold. Additionally, local inner stress induces crack deflection within individual grains, enhancing toughness through energy dissipation. This work provides a new strategy for fabricating robust UHTCs in TMLEs, which is significant for future applications.
研究领域:
材料科学
·
高温陶瓷研究
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Yang Du,Mingyin Kou,Jiguo Tu,Mingyong Wang,Shuqiang Jiao
The electrochemical behavior of TiB 2 anode is investigated in the present work in order to obtain the anodic behavior in molten CaCl 2 -CaO. The work reveals that the passivation film is generated on the surface of TiB 2 anode during the anodic polarization process, leading to a higher pitting potential than that of the Pt electrode. After 100 h potentiostatic electrolysis, the TiB 2 anode shows a corrosion rate as low as 1.38 × 10 -3 g cm -2 h -1 . The formation mechanism of the TiB 2 anode passivation film after electrolysis is determined as TiB 2 + O 2- → Ti(BO 3 ) + O 2- → TiO 2 + CaO → CaTiO 3 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 6
·2860-2867
·
IF 3.502
Da-Wang Tan,Zhen-Yong Lao,Zhan Zhang,Wei-Ming Guo,Shi-Kuan Sun,Hua-Tay Lin
B 4 C-TiB 2 ceramics (TiB 2 ranging 5~70 vol%) with Mo-Co-WC as the sintering additive were prepared by spark plasma sintering. In comparison with B 4 C-TiB 2 without additive, the enhanced densification was evident in the sintered specimen with Mo-Co-WC additive. Core-rim structured grain was observed around TiB 2 grains. The interface of the rim between TiB 2 and B 4 C phases demonstrated different feature: the inner borderline of the rim exhibited a smooth feature, whereas a sharp curved grain boundary was observed between the rim and the B 4 C grain. The formation mechanism is discussed: the epitaxial growth of (Ti,Mo,W)B 2 rim around the TiB 2 core may occur as a result of the solid solution and dissolution-precipitation between TiB 2 phase and the sintering additive. It was revealed that the fracture toughness increased as the content of TiB 2 content increased, alongside the decreased hardness. B 4 C-30 vol% TiB 2 specimen demonstrated the optimal combination of mechanical properties, reaching Vickers hardness of 24.3 GPa and fracture toughness of 3.33 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
MATERIALS CHEMISTRY AND PHYSICS
·
2015
·
IF 2.259
Yicheng Wu,Zhiqiang Yu,Yannan He,Xiaolei Yang
The heat conduction of TiB 2 –Al 2 O 3 /epoxy composites was discussed by comparisons of the finite element model (FEM), the self-consistent model, and experimental results. The experimental thermal conductive performance of epoxy composites was characterized by laser flash method. According to the calculated and experimental results, TiB 2 showed optimistic potential in improving thermal conductive performance of epoxy composites. With the addition of Al 2 O 3 particles, the thermal conductive performance of epoxy composites filled by TiB 2 –Al 2 O 3 composite fillers was improved remarkably at high volume fraction. After surface modification of ceramic fillers by silane coupling agents, the efficiency of the heat diffusion of epoxy composites was increased further. In comparison of the finite element analysis (FEA), the self-consistent model and experimental results, the thermal conductive values of FEA were in reasonable agreement with experimental values, and the calculated values from self-consistent models were lower than the experimental values slightly.
研究领域:
材料科学
·
工程热物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Korean Ceramic Society
·
2024
·
IF 2.7
Wang Zikang,Qian Miao,Shao Geyu,Xu Yuzhen,Song Qi
In this study, spark plasma sintering technology was used for fabricating B 4 C composite ceramics that contained 30 wt% (TiB 2 + SiC) by altering the sintering pressures (0 MPa, 50 MPa, and 80 MPa) at a comparatively low temperature of 1650 °C. This study showed how sintering pressure affected the densification behavior, microstructures, and mechanical characteristics of composite ceramics. Elevating the sintering pressure led to the inhibition of grain growth during the sintering process, ultimately resulting in the refinement of grains within the composite ceramics. At the same time, the quantity of internal pores in the composite ceramics was reduced, and the relative densities increased, so the flexural strength and hardness of the composite ceramics could be effectively improved. The quantity of microcracks and large aspect ratio second phase particles decreased with an increase in sintering pressure, which adversely affected the fracture resistance characteristics of the composite ceramics. In addition, the growth of B 4 C grains was hindered by TiB 2 and SiC generated by in-situ reactions, thus improving the mechanical characteristics of the composite ceramics. Comprehensive analysis showed that the composite ceramics had the best comprehensive mechanical properties when the sintering pressure was 80 MPa, displaying a relative density of 98.65%, a Vickers hardness of 30.71 GPa, a flexural strength of 531.19 MPa, and a fracture toughness of 5.78 MPa m 1/2 .
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）