JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 30
·12221-12235
·
IF 4.5
Lin Huaizhi,Zhang Biao,Xie Wenqi,Wei Zhilei,He Kai,Xia Hongyan,Shi Zhongqi
SiC-B 4 C ceramic skeleton reinforced graphite composites (MCMB/SiC-B 4 C) with extraordinary mechanical performance were fabricated by SPS method. The influence of sintering temperature and volume ratio of B 4 C/SiC on the microstructure and mechanical performance of the composites was studied. With the introduction of B 4 C in the composites, the B atom diffusion at the B 4 C/graphite interface can be activated when the sintering temperature exceeded 1700 °C, which can significantly improve the interfacial combination of the skeleton reinforcement and graphite matrix. Therefore, the relative density and mechanical properties of the composites can be improved. While the sintering temperature reached 1800 °C and the volume ratio of B 4 C/SiC was 4:6 (the total amount of ceramic reinforcement phase was 40 vol%), the composite exhibited the optimal comprehensive performance with bending strength of 202 MPa and fracture toughness of 3.29 MPa·m 1/2 . These values were 146% and 58% higher, respectively, than those of the composite without B 4 C. The developed graphite matrix composites are expected to be applied to extreme conditions such as high load, high temperature and oxidation environments.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yang Wang,Qiang Liu,Biao Zhang,Haoqian Zhang,Zhaoxin Zhong,Jian Ye,Yuhan Ren,Liying Shen,Feng Ye,Wen Wang
The bio-inspired 2024Al/B 4 C composites with a laminate-reticular hierarchical architecture were constructed by squeeze casting of 2024Al into loose freeze-cast ceramic scaffolds. This pressurized infiltration process provided a clean and well-bonded interface without physical gaps. By regulating the initial suspension concentration (20, 25, 30 and 35 vol%), the effects of different ceramic content on the microstructure, damage-tolerance behavior and toughening mechanisms of the composites parallel and perpendicular to the ice-growth direction were investigated. The strength and toughness in the longitudinal direction were greater than that in the transverse direction. The 2024Al/20 vol% B 4 C composite in the longitudinal direction yielded the highest flexural strength of 658 MPa, crack-initiation toughness ( K Ic ) of 18.4 MPa m 1/2 and crack-growth toughness ( K Jc ) of 27.5 MPa m 1/2 . The unique damage-tolerant properties were attributed to multiple toughening mechanisms, including crack deflection, branching and blunting, ductile-ligament bridging and multiple-crack propagation, as evidenced by the stable crack growth and rising R-curve behavior during fracture. The significantly decreased damage tolerance in the transverse direction was mainly due to inadequate toughening tools. On the other hand, both the flexural strength and fracture toughness reduced remarkably as the ceramic content increased. The 2024Al/35 vol% B 4 C composite fractured in a single-crack mode and the crack growth path was almost straight, showing a relatively low flexural strength (502 MPa) and crack-initiation toughness (9.1 MPa m 1/2 ). The toughening mechanism was discussed in terms of the relationship between structural characteristics and cracking mode.
研究领域:
材料科学
·
力学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Shuhan Dong,Yang Yang,Tingting Liang,Ruina Ma,An Du,Mingxu Yang,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Superhydrophobic coating technology is a promising anticorrosion method for metals. In this paper, a simple composite electrodeposition technique is proposed, in which micron-sized B 4 C particles are added to the electrolyte to construct Ni-B 4 C composite coating which exhibits a unique micro-nano structure. The addition of B 4 C particles promotes the construction of rough structure and enhances the corrosion resistance of the coating. When the B 4 C content is 3 g/L, the contact angle of the coating modified using a low surface energy material, reaches 162.5 ± 2°. The coating exhibits an excellent barrier effect against the corrosive medium. The superhydrophobic coating (M B-3 ) displays excellent corrosion resistance, and the corrosion protection efficiency reaches 99.53% in 3.5 wt% NaCl solution. The corrosion current density of M B-3 is 7.95 × 10 −8 A/cm 2 , which is three orders of magnitude lower than that of the pure Ni coating (M B-0 ). The addition of B 4 C promotes the growth of the coating, resulting in excellent shielding and stability.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 3
·1919-1927
·
IF 2.1
Rong Tu,Jiaojiao Li,Mingpu Jia,Qizhong Li,Meijun Yang,Song Zhang,Takashi Goto
B 4 C–CrB 2 composites were prepared by arc-melting using B 4 C and CrB 2 powders as raw materials. The eutectic composition of B 4 C–CrB 2 system was 30B 4 C–70CrB 2 (mol%) with a labyrinth-like irregularly layered eutectic microstructure, composed of B 4 C phase about 1–2 μm in thickness dispersing in CrB 2 matrix, much smaller than raw powders. The interface of the eutectic composite was well bonded, and there were edge dislocations at the interface to alleviate the interface mismatch. The eutectic temperature of B 4 C–CrB 2 composites was approximately 2200 K. At the eutectic composition, the B 4 C–CrB 2 composites showed the maximum Vickers hardness (24.6 GPa) and fracture toughness (4.3 MPa m 1/2 ) at room temperature.
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
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
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Fawei Wang,Liang Xu,Ji Zou,Jingjing Liu,Huayue Liang,Wei Ji,Weimin Wang,Zhengyi Fu
High entropy boride ceramics have great potential as structural materials serving in extreme environments. However, their applications are limited by the difficulty of sintering. In the present study, dense (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 ceramics with B 4 C additions were prepared through pressureless sintering at as low as 1900 °C. Calculations based on the CALPHAD approach predict that (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 starts to melt at about 3315 °C whilst B 4 C additions reduce the temperature and broaden the temperature region where solid and liquid coexist. Results showed that the introduction of B 4 C could trigger the densification of (Ti 0.2 Zr 0.2 Hf 0.2 Nb 0.2 Ta 0.2 )B 2 at a lower temperature and promote their densification significantly. The relative density of samples with 5 wt% of B 4 C additions sintered at 1900 and 2000 °C was 97.7 % and 99.7 %, respectively. While the sintering temperature was further increased to 2100 °C, the liquid phase was reactively formed, leading to the rapid grain coarsening in samples with B 4 C additions. Strengthened by well-dispersed B 4 C grains, the sample with 5 wt% B 4 C sintered at 2000 °C exhibited excellent mechanical properties with the Vickers hardness, flexural strength, and fracture toughness of 21.07 ± 2.09 GPa, 547 ± 45 MPa, and 5.24 ± 0.14 MPa m 1/2 , which are comparable or even higher than counterparts sintered under pressure.
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 MATERIALS SCIENCE
·
2021
·Vol. 56
·期 25
·13989-14000
·
IF 4.22
Wang Yang,Liu Qiang,Zhang Biao,Zhang Haoqian,Jin Yicheng,Zhong Zhaoxin,Ye Feng,Wang Wen
Freeze casting technique has become a promising way to assemble various components into multifunctional nacre-like materials. Surprisingly, although many ceramics materials have been processed by this approach, there are few studies reporting the structure–property-processing relationships of freeze-cast porous B 4 C ceramics. Here we generate bimodally lamellar porous B 4 C scaffolds by freeze casting and describe how processing parameters such as solid concentration and freezing front velocity control the architecture. The porosity, pore morphology and lamella thickness of B 4 C scaffolds can be tailored via altering such two parameters, which makes the scaffolds with excellent mechanical properties suitable as a support for the melt infiltration process. The pore morphology, structural characteristics, compressive mechanical response and fracture mechanism of the scaffolds are explored. Additionally, we have utilized a morphology map to identify the different structures such as lamellar and dendritic, which are formed by varying processing parameters. This study offers the freeze-cast scaffolds with custom-designed structure and mechanical properties for developing bioinspired multifunctional materials represented by B 4 C/Al composites.
研究领域:
材料科学
·
生物医学工程
✓ 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
Materials Today Communications
·
2021
·
IF 3.383
Aiyang Wang,Qianglong He,Wenchao Guo,Chun Liu,Tian Tian,Lanxin Hu,Lisheng Liu,Weimin Wang,Zhengyi Fu
B 4 C ceramics were strengthened by introducing the hard second–phase particles TiB 2 and SiC, and the effects of TiB 2 and SiC contents on the microstructure and properties of the composites were investigated. B 4 C–TiB 2 binary composites with TiB 2 contents of 10, 20, 30, and 40 vol% were prepared by hot pressing. The microstructure, mechanical properties, and electrical properties of the composites with different TiB 2 contents were investigated and compared. The results showed that the B 4 C–30 vol%TiB 2 composite obtained the best comprehensive properties, with a relative density, hardness, bending strength , fracture toughness , and conductivity of 97.9 %, 29.5 GPa, 590 MPa, 6.41 MPa m 1/2 , and 7.6 × 10 4 S/m. The compressive stress generated on B 4 C, crack deflection induced by TiB 2 , and conductive network formed by TiB 2 are of great significance in the context of the properties of the B 4 C–TiB 2 composites. In addition, B 4 C–TiB 2 –SiC ternary composites with SiC contents of 0, 10, and 20 vol% were also fabricated by hot pressing. The effect of SiC content on the microstructure and mechanical properties, and the effect of SiC on the antioxidant properties of the composites were investigated. The results showed that the B 4 C–30 vol%TiB 2 –10 vol%SiC composite had the best comprehensive properties, with a relative density, hardness, flexural strength, fracture toughness, and residual flexural strength (1600 ℃) of 98.8 %, 29.5 GPa, 621 MPa, 6.80 MPa m 1/2 , and 465 MPa. The inhibition of the growth of SiC to other grains, removal of oxide impurities, and repair of damage by SiC oxidation products play an important role in the performance of the B 4 C–TiB 2 –SiC composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Hanqing Zhao,Lingyu Meng,Feiyu Wang,Irfan,Ming Hu
Powder preparation is the key step in producing laser cladding coatings with desired properties. In this paper, quaternary TiO 2 -B 4 C-C-Cu composite powder with high sphericity and good densification has been successfully prepared by a powder fabrication process combining spray granulation with densification sintering. The effects of slurry characteristics, spray granulation process parameters, and densification sintering temperature on particle morphology and performance were studied. The formation mechanism of quaternary spherical TiO 2 -B 4 C-C-Cu composite powder was revealed by analyzing the process of heat transfer and water transfer in the droplets, and the optimization direction of the powder preparation was indicated. The optimized process parameters for the quaternary spherical TiO 2 -B 4 C-C-Cu composite powder are: slurry solid content of 52 wt%, dispersant content of 1.25 wt%, binder content of 2 wt%, inlet temperature of 180 °C, the airflow rate of 310 L/h, slurry feed rate of 4.5 ml/min, and the two-stage temperatures of densification sintering are 500 ℃ and 900 ℃ for 1 h, in turn. Under the optimized process, the fluidity of the powder reaches 112 s/50 g, the apparent density reaches 1.2 g/ml, and more than 70% of the particles are between 15–53 µm. The powder has been verified by laser cladding to prepare in-situ synthesized TiB 2 -TiC-Cu composite coatings , which could have a better prospect for potential application.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Shuai Wang,Yangyang Deng,Mingsheng Yang,Luyao Wang,Huaiqian Li,Pengfei Xing
Dense B 4 C–SiC–CrB 2 ternary composites were fabricated via reactive hot pressing with B 4 C and chromic silicides (84 wt% CrSi 2 +16 wt% CrSi) as raw materials. The effects of chromic silicides on the densification, phase components, microstructure and performance of the prepared composites were investigated. The reaction mechanism and toughening mechanism were also studied. The results indicated that the chromic silicides were the reactive sintering aids which reacted with B 4 C and C to introduce CrB 2 and SiC in the matrix in situ. Partial B 4 C, CrB 2 and SiC formed the eutectic liquid phase, which enhanced the densification of B 4 C. The addition of chromic silicides enhanced the densification and fracture toughness while reduced the hardness. The good comprehensive performances of 435 MPa flexural strength , 4.09 MPa m 1/2 fracture toughness and 33.11 GPa hardness were obtained in the composites fabricated with 10 wt% chromic silicides. The higher addition amounts of chromic silicides resulted in the larger-size SiC, which reduced the flexural strength. The transgranular fracture of SiC and partial CrB 2 , the existing phenomena such as microcracks , crack branching and crack deflection could cumulatively improve the fracture toughness of the materials.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）