JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Rong Tu,Nian Li,Qizhong Li,Song Zhang,Lianmeng Zhang,Takashi Goto
In order to improve the hardness and toughness simultaneously, B 4 C–HfB 2 –SiC ternary composites were synthesized by arc-melting using B 4 C, HfB 2 and β-SiC powders as raw materials. The ternary eutectic composition of 45B 4 C–15HfB 2 –40SiC (mol%) was first identified with a lamellar eutectic texture. HfB 2 about 500 nm in thickness and SiC about 700 nm in thickness were uniformly dispersed in B 4 C matrix of the eutectic composite, much smaller than raw powders. The Vickers hardness and fracture toughness of B 4 C–HfB 2 –SiC ternary eutectic were 35.7 GPa and 6.5 MPa m 1/2 at the eutectic composition, respectively.
研究领域:
材料科学
·
复合材料
·
陶瓷材料
·
高温材料
·
力学性能
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zhiwei Xu,Xiangxing Zhou,Ke Peng,Tiechui Yuan,Ruidi Li,Zhihui Zhou
In this study, fast hot-pressing sintering and the power of B 4 C and 1/3/5/7 wt% Al 2 O 3 were used to make B 4 C-Al 2 O 3 composite ceramics at 2000°C and 30 MPa. The toughening mechanism was thoroughly examined, and the impact of Al 2 O 3 content on the microstructures and mechanical characteristics of B 4 C-Al 2 O 3 composite ceramics was examined. The comprehensive mechanical properties of B 4 C-Al 2 O 3 composite ceramics were optimized by adding 3 wt% Al 2 O 3 , the relative density, flexural strength , fracture toughness, and Vickers hardness reached 99.38 %, 616.2 MPa, 5.45 MPa∙m 1/2 , and 35.91 GPa, respectively. The strengthening mechanism of B 4 C-Al 2 O 3 composite ceramics is that grain refinement and grain boundary movement are hindered by second-phase particles. And the toughening mechanism is crack deflection and Al 2 O 3 grain cracking.
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
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Youhong Sun,Jinhao Wu,Linkai He,Baochang Liu,Chi Zhang,Qingnan Meng,Xuliang Zhang
Diamond/WC-Fe-Ni composite is a potential composition for impregnated diamond drill bits. It is necessary to avoid the graphitization of the diamond from Fe and Ni under the powder metallurgy process. Boron carbide (B 4 C) was coated on diamond, and diamond/WC-Fe-Ni composites were consolidated by hot pressing at different temperatures. The influences of sintering temperature and interfacial structure on bending strength and wear behavior were investigated. The bending strength for diamond/WC-Fe-Ni composite was dependent on matrix densification and interfacial graphitization. Un-coated diamond was eroded by Fe-Ni matrix and partially converted to graphite during the sintering process at all sintering temperatures. In opposite, B 4 C coating was beneficial to matrix densification at a lower sintering temperature, and delayed the appearance of graphitization to around 1300 °C. Therefore, the diamond/WC-Fe-Ni composites with B 4 C coating exhibited larger bending strength and better wear behavior at a relative low sintering temperature.
研究领域:
材料科学
·
矿物工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Yang Wang,Qiang Liu,Biao Zhang,Junjie Ding,Haoqian Zhang,Yicheng Jin,Zhaoxin Zhong,Wen Wang,Feng Ye
The boron oxide and impurities existing on the surface of B 4 C powder are detrimental to the sintering of the green body, greatly limiting its application. Here, we utilize three powder pretreatment methods, including washing powder in acid solution, alkali solution and ethanol solution, to solve this problem. Furthermore, the produced freeze-cast porous B 4 C ceramics with unidirectionally aligned pore channels are studied in terms of the sinterability, pore morphology, microstructure and mechanical properties . The powder pretreatments contribute to the remove of boron oxide and impurities as well as the acceleration of densification process of the porous ceramics . The decreased porosity, wavelength and lamellar thickness, and high pore connectivity are the main reasons for the enhanced mechanical properties especially in the direction perpendicular to the freezing. By comparison, the purification with acid solution is established as the optimal technique for powder pretreatment. The research confirms that the pretreatment of B 4 C powder is essential for the removal of boron oxide and impurities to improve performance, thereby widening the application scopes of materials.
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
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Jiyun Zheng,Guogang Shu,Wei Wang,Qiulin Li,Wei Liu
Surface quality improvement by Cu activation and oxidation roughening process was studied during electroless coating Cu on boron carbide (B 4 C) particles. The surface morphology was characterized by scanning electron microscope (SEM) and the phase identification was determined by X-ray diffraction (XRD) analysis. Two aspects concluding surface activation and surface roughening were investigated to understand the effect of each on Cu coating. Cu activation process increased surface activity of B 4 C by pre-deposition Cu nano-crystals, which was effective and cost-saving when compared with conventional Pd activation method. The influence of activation pH on electroless Cu coating was discussed and a moderate pH 12 is suitable for Cu deposition. Surface roughening process availably promoted wettability of B 4 C particles with aqueous solution. Etched pits were formed on B 4 C surface and resulted in fresh surface exposed after oxidization roughening process, which was beneficial for Cu bonding and coating on B 4 C surface.
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
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2022
·Vol. 148
·期 3
·789-805
·
IF 4.755
Zhu Di,Huang Zhixiong,Shi Minxian,Qin Yan,Zou Zhenyue,Deng Zongyi
BPR has been widely used as ablative material for thermal protection on aircraft surface. In this study, model-free method was employed to study the kinetic models of BPR and ZrSi 2 /B 4 C-Ph composite. In addition, the thermal stability, chemical reaction and structure evolution during pyrolysis of ZrSi 2 /B 4 C-Ph composite were characterized by TGA, XRD, XPS, GC–MS and TG-MS. The results indicated that the pyrolysis of BPR includes three consecutive and overlapping stages. And the kinetic mechanism function f(α) , apparent activation energy E a and pre-exponential factor A of each stage were confirmed. Besides, the high char yield of ZrSi 2 /B 4 C-Ph composite is mainly attributed to the reaction of ZrSi 2 and B 4 C with gases released during BPR pyrolysis, which formed solid phases such as amorphous carbon, ZrO 2 , SiO 2 and B 2 O 3 .
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
·
2018
·
IF 3.794
Qianglong He,Aiyang Wang,Chun Liu,Weimin Wang,Hao Wang,Zhengyi Fu
B 4 C-TiB 2 -SiC composites were fabricated via hot pressing using ball milled B 4 C, TiB 2 , and SiC powder mixtures as the starting materials. The impact of ball milling on the densification behaviors, mechanical properties , and microstructures of the ceramic composites were investigated. The results showed that the refinement of the powder mixtures and the removal of the oxide impurities played an important role in the improvement of densification and properties. Moreover, the formation of the liquid phases during the sintering was deemed beneficial for densification. The typical values of relative density, hardness, bending strength , and fracture toughness of the composites reached 99.20%, 32.84 GPa, 858 MPa and 8.21 MPa m 1/2 , respectively. Crack deflection, crack bridging, crack branching, and microcracking were considered to be the potential toughening mechanisms in the composites. Furthermore, numerous nano-sized intergranular/intragranular phases and twin structures were observed in the B 4 C-TiB 2 -SiC composite.
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 EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Xiaorong Zhang,Zhixiao Zhang,Yuming Liu,Aiyang Wang,Shi Tian,Weimin Wang,John Wang
In this work, we systematically studied the effects of powder characteristics (B 4 C, TiC and Si powders) on the existential form of toughening phases (SiC and TiB 2 ) as well as the overall microstructure and properties of B 4 C–TiB 2 –SiC composites fabricated by reactive hot pressing. The particle size of the TiC powder plays a largely determining role in the development of novel toughening phases, the TiB 2 –SiC composite structure, that are formed in the B 4 C matrix, while the Si particle size affects the agglomerate level of the SiC phase. The TiB 2 –SiC composite structure and SiC agglomerates enhance the fracture toughness, but decrease the flexural strength . Both the microstructure and mechanical properties of B 4 C–TiB 2 –SiC composites can be effectively tuned by regulating the combinations of the particle sizes of the starting powders. The B 4 C–TiB 2 –SiC composites demonstrate flexural strength, fracture toughness and Vickers hardness in the respective range of 567–632 MPa, 5.11–6.38 MPa m 1/2 , and 34.8–35.6 GPa.
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 EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Shoulong Lai,Jinhao Zang,Weixia Shen,Guofeng Huang,Chao Fang,Yuewen Zhang,Liangchao Chen,Qianqian Wang,Biao Wan,Xiaopeng Jia,Zhuangfei Zhang
The B 4 C-diamond composite with high hardness and toughness was first prepared by high-pressure sintering of B 4 C and diamond powders at 5 GPa and 1600 °C. The effect of the diamond fraction on the densification, microstructure and mechanical properties of B 4 C-diamond composite were investigated. The results indicated that the hardness of the as-prepared composite ceramics increased gradually with the increase in diamond content. The composite having 40 vol% diamond exhibited excellent comprehensive mechanical properties with a relative density of 98.3%, a density of 2.86 g/cm 3 , Vickers hardness of 39.8 GPa and fracture toughness of 8.1 MPa·m 1/2 . The use of superhard diamond enhanced the fracture toughness of the B 4 C while maintaining its lightweight and high hardness. The main toughening mechanisms were crack bridging, crack deflection and pull-out of homogeneously dispersed diamond grains. Superhard second phase dispersion high-pressure sintering provides a new technical route to improve the properties of advanced composites.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Guoqin Jiang,Zongyi Deng,Minxian Shi,Wei Zhang,Yang Liu,Wenjing Cao,Linqin Gao,Yanbin Wang,Zhixiong Huang
Carbon fiber/phenolic resin (CF/Ph) composites are widely used as outer surface thermal protection materials in hypersonic vehicles because of their excellent ablation resistance. As the flight speed of the vehicle increases, the problem of CF being prone to oxidation in high-temperature aerobic environments becomes more severe, hindering the adaptation of CF/Ph to more extreme service environments. In this study, ZrSi 2 -B 4 C was introduced into carbon fibre/boron phenolic resin (CF/BPR) to improve its ablation resistance. At 2.4 MW/m 2 , the linear ablation rate (LAR) and mass ablation rate (MAR) of the composites were as low as −0.032 mm/s and 0.0186 g/s, respectively. At 3.6 MW/m 2 , the LAR and MAR were as low as −0.005 mm/s and 0.0273 g/s, respectively. These findings indicate that the ceramizable composites exhibit excellent ablation resistance under both low and high heat flux conditions. The ablation mechanism of the composites was revealed. The in situ ceramization of ZrSi 2 and B 4 C formed a Zr-Si-B-C-O ceramic layer, which hindered the thermal oxidation and aerodynamic erosion of CF and PyC.
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
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2021
·Vol. 35
·期 6
·1031-1037
·
IF 0.957
Cao Yaoqin,He Qianglong,Wang Weimin
B 4 C-TiB 2 -SiC composites with excellent properties were prepared by reactive hot-pressing using B 4 C, TiC, and Si powders as the raw materials. The phase transition process was investigated by heating the powder mixture to different temperatures and combined with XRD tests. TiB 2 and SiC phases were synthesized through an in situ reaction, and the mechanical and thermal properties were improved simultaneously. Microstructure and mechanical properties were also studied, and the 60wt% B 4 C-21.6wt% TiB 2 -18.4wt% SiC composite showed a relative density of 99.1%, Vickers hardness of 34.6 GPa, flexural strength of 582 MPa, and fracture toughness of 5.08 MPa·m 1/2 . In addition, the values of thermal conductivity and thermal expansion coefficient were investigated, respectively.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Qi Song,Zhao-Hui Zhang
As a kind of structural ceramic , ultrahigh hardness B 4 C ceramics are sensitive to flaws, especially surface flaws , which cause mechanical property degradation. The present study intended to achieve flaw self-healing with the pre-oxidation treatment method at 1073 K for 15–60 min, which effectively improved the flexural strength of the B 4 C– TiB 2 – SiC composite ceramic. The changes in surface morphology and flexural strength over pre-oxidation time were studied in detail, and schematic diagrams of pre-oxidation strengthening process were systematically proposed. The research results indicated that the pre-oxidation treatment could heal pores and cracks because glassy oxide B 2 O 3 , which has a low melting point, could flow and fill flaws on composite ceramic surfaces efficiently and, in turn, significantly improve mechanical performance. The flexural strength of the composite ceramic reached a maximum of 684 MPa at the optimum pre-oxidation time of 45 min, which was an increase of 28.77% compared with that of the untreated composite ceramic. Further increasing the pre-oxidation time resulted in a decrease in flexural strength due to pores forming on surfaces again, which was induced by the production of more CO gas and the intensive evaporation of the B 2 O 3 glass phase.
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）