JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·2041-2052
·
IF 2.956
Yehong Cheng,Yang Lyu,Wenbo Han,Ping Hu,Shanbao Zhou,Xinghong Zhang
The design of bioinspired architectures is effective for increasing the toughness of ceramic materials. Particularly, a dual composite equiaxial architecture is ideal for fabricating weak interface-toughened ZrB 2 -SiC ceramics with isotropic performance. In this paper, ZrB 2 -SiC-Graphene@ZrB 2 -SiC dual composite ceramics were synthesized via an innovative processing technique of granulating-coating method. ZrB 2 -20 vol.% SiC containing 30 vol.% Graphene was selected as weak interface to realize multiscale toughening and improve the thermal shock resistance of ZrB 2 -SiC ceramic materials. The incorporation of ZrB 2 -SiC-Graphene weak interface into the ZrB 2 -SiC matrix improved the damage tolerance and critical thermal shock temperature difference. The design of equiaxial structures moderated the anisotropy of performance in different planes. The graphene sheets incorporated in the ZrB 2 -SiC-Graphene interface phase played a key role in multiscale toughening, including macroscopic toughening of crack deflection and microcracks, and microscopic toughening of graphene bridging and pull-out.
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
CORROSION SCIENCE
·
2015
·
IF 4.422
Dong Huang,Mingyu Zhang,Qizhong Huang,Liping Wang,Liang Xue,Xian Tang,Kejian He
C/C–ZrB 2 –ZrC–SiC composites were fabricated by polymer infiltration and pyrolysis (PIP) with a preform of C f /ZrB 2 . The ZrB 2 powders were sprayed onto fabric layer by layer before the fabric is needled. After introduction of resin carbon and ZrC–SiC into the preform, a ceramic coating on the matrix and fibres was formed in the composites. The plasma ablation test indicates that the composites possess a good ablation resistance after ablation for 180 s and 240 s. The SiO 2 –ZrO 2 barrier layer, high temperature Zr–Si–O glass layer and heat dissipation all contribute to the good ablation resistance of the composites.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Chuntao Ge,Qian Kou,Wenjuan Qi,Saijun Xiao,Weiliang Jin,Jun Zhang,Hongmin Zhu,Jie Li
Electrophoretic deposition of ZrB 2 nanoparticles in high-temperature molten salts can be used for the preparation of ZrB 2 coatings, and its related investigation is still in its early stage. In this paper, a dense and adhesive ZrB 2 coating has been produced by electrophoretic deposition in NaCl–KCl–AlCl 3 molten salts containing ZrB 2 nanoparticles at 983 K, showing good mechanical properties and high-temperature oxidation resistance . Moreover, the effect of ZrB 2 nanoparticles concentration (10–100 g/L) on the preparation of ZrB 2 coatings by electrophoretic deposition has been explored. The dependence of the consumed charge on the ZrB 2 deposition amount under various ZrB 2 nanoparticles concentration has been demonstrated. It is assumed that at a low ZrB 2 concentration (10–60 g/L), the increase of the deposition amount of ZrB 2 corresponds linearly to the increase of the consumed charge; while at a high ZrB 2 concentration (70–100 g/L), due to the possible occurrence of agglomeration and sedimentation during the electrophoretic migration, the charge consumed to form a unit weight of ZrB 2 deposits is higher than that at a low ZrB 2 concentration. It is important to select an optimal ZrB 2 concentration to achieve a high deposition efficiency. The study in this paper can provide guidance for the selection of an optimal ZrB 2 nanoparticle concentration in the process of preparing ZrB 2 coatings by molten salt electrophoretic deposition.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 11
·4870-4875
·
IF 2.956
Wei-Ming Guo,Li-Xiang Wu,Jun-Jie Yu,Ling-Yong Zeng,Shi-Kuan Sun,Jing-Xi Li,Shang-Hua Wu,Hua-Tay Lin,Cheng-Yong Wang
Based on the previous work on Si 3 N 4 –ZrB 2 [Wu et al. J Eur Ceram Soc ;2017,37:4217], the influence of ZrB 2 addition on the phase and microstructure evolution of Si 3 N 4 –ZrB 2 composites was emphatically investigated, and the mechanical properties were compared with pure Si 3 N 4 ceramics. It was revealed that the ratio of β- to (α+β)-Si 3 N 4 significantly increased from 14.3% in pure Si 3 N 4 ceramics to 39.8% in Si 3 N 4 with 15 vol% ZrB 2 addition, indicating that the introduction of ZrB 2 promoted α- to β-Si 3 N 4 phase transformation. As a consequence, the microstructure of the composite showed the bimodal distribution, containing both elongated and equiaxed Si 3 N 4 grains. For the pure Si 3 N 4 , Vickers hardness, fracture toughness and flexural strength was 22.8 GPa, 7.6 MPa m 1/2 , and 334.5 MPa, respectively. In contrast, the composite of Si 3 N 4 –30 vol% ZrB 2 simultaneously possessed an excellent combination of mechanical properties: 19.5 GPa in hardness, 9.8 MPa m 1/2 in toughness and 702.0 MPa in strength. Present study suggested that Si 3 N 4 -based ceramics with high hardness, high toughness, and high strength could be obtained by the combination of appropriate ZrB 2 content and low hot-pressing temperature.
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
·
2018
·
IF 3.057
Yuehua Lin,Jinghang Liu,Shaolei Song,Jingbo Liu,Sajid Bashir,Yun Guo,Qiang Zhen
The microstructure evolution of rod-shaped ZrB 2 in situ synthesis of ZrB 2 -SiC composite powder was studied under different heat treatment. TG-DSC, XRD , SEM, EDS, TEM, and HRTEM were used to describe the preparation, phase composition and morphology of rod-shaped ZrB 2 . As a result, tiny ZrB 2 rod grew out of the liquid phase and adopts a layered growth process. As the rod grew in the longitudinal and transverse directions, the surrounding liquid phase was consumed, and the adjacent rods began to grow in parallel or cross grow to form multiple structures.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2011
·
IF 1.472
Xinghong Zhang,Yang Hou,Ping Hu,Wenbo Han,Junting Luo
The dispersion and co-dispersion behavior of ZrB 2 and SiC nanopowders in ethanol solution was studied by sedimentation test, particle size measurement and transmission electron microscope (TEM) analysis. The dispersion behavior of ZrB 2 and SiC nanopowders in ethanol solution was strongly dependent on the pH values, types and amounts of dispersant. PEI was found to be effective for the dispersion of both ZrB 2 and SiC nanopowders in ethanol solution. With the addition of PEI, the isoelectric points of ZrB 2 and SiC nanopowders in ethanol solution were at pH 10 and pH 9.5, and shift to pH 13 and pH 12.3, respectively. The stability of ZrB 2 suspension increased with the dispersant content increasing until reached 0.7 wt% and well-dispersed SiC slurry can be obtained with more than 2.5 wt% PEI. The suitable pH value for the dispersion of ZrB 2 and SiC nanopowders should be lower than 12 and 10, respectively. The well co-dispersed ZrB 2 and SiC nanocomposite powders can be achieved by using 1 wt% or more PEI below pH 10.
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 AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 6
·2131-2137
·
IF 2.787
YeHong Cheng,Yushi Qi,Ping Hu,Shanbao Zhou,Guiqing Chen,Jiadong An,Kunfeng Jin,Wenbo Han
To avoid introduction of milling media during ball-milling process and ensure uniform distribution of SiC and graphite in ZrB 2 matrix, ultrafine ZrB 2 –SiC–C composite powders were in-situ synthesized using inorganic–organic hybrid precursors of Zr(OPr) 4 , Si(OC 2 H 5 ) 4 , H 3 BO 3 , and excessive C 6 H 14 O 6 as source of zirconium, silicon, boron, and carbon, respectively. To inhabit grain growth, the ZrB 2 –SiC–C composite powders were densified by spark plasma sintering (SPS) at 1950°C for 10 min with the heating rate of 100°C/min. The precursor powders were investigated by thermogravimetric analysis–differential scanning calorimetry and Fourier transform infrared spectroscopy. The ceramic powders were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The lamellar substance was found and determined as graphite nanosheet by scanning electron microscopy, Raman spectrum, and X-ray diffraction. The SiC grains and graphite nanosheets distributed in ZrB 2 matrix uniformly and the grain sizes of ZrB 2 and SiC were about 5 μm and 2 μm, respectively. The carbon converted into graphite nanosheets under high temperature during the process of SPS. The presence of graphite nanosheets alters the load-displacement curves in the fracture process of ZrB 2 –SiC–G composite. A novel way was explored to prepare ZrB 2 –SiC–G composite by SPS of in-situ synthesized ZrB 2 –SiC–C composite powders.
研究领域:
材料科学
·
陶瓷
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 19
·2300391
·
IF 3.6
Yuting Duan,Jincui Ren,Chaofeng Lv,Xinyi Li,Yisheng Wu
ZrB 2 –SiC coatings are prepared on the surface of graphite by slurry brushing method to improve the oxidation resistance. Effects of ZrB 2 content and polyvinyl butyral (PVB)–ethanol solution concentration on microstructure and static oxidation behavior of the ZrB 2 –SiC coatings are investigated at 1200 °C in air. The results indicate that increasing ZrB 2 content improves the oxidation resistance of the coatings. When ZrB 2 content increases from 30 to 45 wt%, weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from −0.92% to −1.67%. Increasing binder solution concentration raises component content in the coatings. As PVB–ethanol binder concentration increases from 0.025 to 0.075 g mL −1 , weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from 0.32% to −0.38%. Excellent oxidation resistance of ZrB 2 –SiC coating is attributed to self-sealing ability of B 2 O 3 and borosilicate glass. The composite glass can inhibit oxygen diffusion by filling defects in the coating promptly. The borosilicate glass phase can enhance the fluidity of the composite glass. ZrO 2 and ZrSiO 4 particles restrict the growth of the microcrack, which improves the oxidation resistance of ZrB 2 –SiC coating.
研究领域:
材料科学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY LETTERS
·
2016
·Vol. 65
·期 1
·1-9
·
IF 1.758
Liu Xiaoyan,Wu Yicheng,Yu Zhiqiang
The tribological behaviors of epoxy composites filled with organic functionalized ZrB 2 –Al 2 O 3 were environmentally investigated and compared with those with as-received fillers under both dry and oil sliding conditions in this work. The worn surfaces and the transfer films on the counterparts were characterized by scanning electronic microscope (SEM), and the frictional temperature rising was investigated by infrared thermometer. The results demonstrated that the coefficient of friction (CoF), the wear rate, as well as the frictional temperature rise of the epoxy composites were all decreased due to the introduction of ZrB 2 –Al 2 O 3 fillers. And with the increase in filler content, similar variation tendencies of CoF and wear rate of epoxy composites were observed under the different sliding conditions. Besides, the organic functionalization of ZrB 2 –Al 2 O 3 fillers, which made the epoxy composites exhibit lower CoF and wear rate than those with as-received fillers, lowered the frictional temperature as well. In comparison, the epoxy composites filled with 5 vol% modified fillers presented better tribological properties, suggesting a stronger interfacial bonding between modified fillers and epoxy matrix. The dominant wear mechanisms of filled composites under dry and oil sliding conditions could be inferred as the combination of adhesive wear and abrasive wear and the fatigue wear, respectively, on the basis of SEM images of worn surfaces.
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
·
2020
·
IF 4.495
Yehong Cheng,Yaxiong Liu,Yumin An,Ning Hu
Graphene derivative materials exhibit excellent mechanical and thermal properties, which have been extensively used to toughen ceramics and improve thermal shock resistance . To overcome the thermal agglomeration of graphene oxide (GO) during heating and drying process, ZrB 2 -SiC particles decorated GO hybrid foam with uniformly anchored ceramic particles was synthesized by electrostatic self-assembly and liquid nitrogen-assisted freeze-drying process. Densified rGO/ZrB 2 -SiC ceramics with varying microstructure, thermal physical and mechanical properties were obtained by adjusting the content of decorated ceramic particles. Although the flexural strength of rGO/ZrB 2 -SiC ceramics have an attenuation compared with that of ZrB 2 -SiC ceramic, the thermal conductivity , work of fracture and thermal shock resistance are greatly improved. rGO/ZrB 2 -SiC ceramics exhibit delayed fracture and increasing R-curve behavior during the crack propagation . The novel preparation technology allows for the well dispersion of rGO in ZrB 2 -SiC ceramics and can be easily extended to other ceramic or metal materials systems.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
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
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2012
·
IF 2.003
Rujie He,Ping Hu,Xinghong Zhang,Chen Liu
Complex-shaped ZrB 2 –SiC ultra high temperature ceramic components were successfully fabricated by gelcasting technique and pressureless sintering. When 0.4 wt% poly(acrylic acid) (PAA) was used as dispersant and the pH value was 10, an aqueous ZrB 2 –SiC–B 4 C–C slurry with a high solid loading up to 50 vol% but low viscosity (3.1 Pa s at 60 s −1 ) was prepared. For gelcasting process, the suitable monomers content (AM and MBAM) and the mass ratio of monomers (AM/MBAM) were selected as 3 wt% and 15:1, respectively. After pressureless sintering at 2100 °C for 2 h, ZrB 2 –SiC ceramics (using B 4 C and C as sintering additives) finally achieved about 98% density. Investigation of the mechanical properties revealed a flexural strength of 405±27 MPa and a fracture toughness of 4.3±0.3 MPa m 1/2 . Complex-shaped ZrB 2 –SiC ceramic components with homogeneous microstructure were also successfully produced. This study confirms that gelcasting is a reliable process for the fabricating of complex-shaped ultra high temperature ceramic components with satisfied properties.
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
危险品化学品经营许可证（带存储）