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16 results on '"Feng, Shangshen"'

7. Preparation and characterization of monoclinic rod-shaped ZrO 2 whiskers via sulfate flux

Author

Jianbo Wu, Li Zhang, Zhang Ping, Mengxian Zhang, Feng Shangshen, Hu Cheng, Fang Yihang, and Zhao Xianrui

Subjects
Materials science, Process Chemistry and Technology, Whiskers, Recrystallization (metallurgy), 02 engineering and technology, Anisotropic growth, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, Chemical engineering, chemistry, Materials Chemistry, Ceramics and Composites, Selected area diffraction, Sulfate, 0210 nano-technology, High-resolution transmission electron microscopy, Dissolution, Monoclinic crystal system
Abstract

Monoclinic rod-shaped ZrO2 whiskers were prepared in liquid conditions using a sulfate flux with ZnSO4 and Na2SO4 in an alumina crucible. TG-DSC, XRD, SEM, TEM, HRTEM, SAED and EDS were employed to characterize the structure, morphology and growth mechanism of the as-synthesized whiskers. The results demonstrated that both the heating temperature and holding time influence the formation of ZrO2 whiskers. When the heating temperature and holding time were 900 °C and 30 min, the ZrO2 whiskers were elongated along the [ 0 1 ¯ 1 ] direction, had an average length and diameter of 600 nm and 70 nm, and exhibited a well-crystallized, one-dimensional structure and smooth surface with no distinct defects. The growth of the whiskers was dominated by the liquid-solid (LS) growth mechanism, affording anisotropic growth through dissolution/recrystallization.

Published
2018

10. In situ production of ultra-fine Ti(C,N)–TiB2–Co cermets by reactive hot processing from the Co–Ti–C–BN system

Author

Mengxian Zhang, Feng Shangshen, Xianrui Zhao, Feng Xu, and Dun Wen Zuo

Subjects
Materials science, 020502 materials, Metallurgy, chemistry.chemical_element, 02 engineering and technology, Cermet, 021001 nanoscience & nanotechnology, Microstructure, Differential scanning calorimetry, 0205 materials engineering, chemistry, Chemical engineering, Cemented carbide, Relative density, 0210 nano-technology, Tin, Carbon, Solid solution
Abstract

In this paper, ultra-fine Ti(C,N)–TiB 2 –Co cermets were prepared by reactive hot processing from the Co–Ti–C–BN system. Microstructure observation indicated that Co and TiB 2 uniformly distributed in the ultra-fine Ti(C,N) matrix. Carbon contents in the reactants had a great influence on the porosity and properties of synthesized cermets. In the range of 11.76–13.79 at.% carbon, dense samples were obtained. With increasing carbon contents, the relative density and hardness decreased due to the existence of residual carbon. The wear resistance of dense Ti(C,N)–TiB 2 –Co cermets were better than that of YT15 cemented carbide. In addition, the reaction process in the Co–Ti–C–BN system was explored by differential scanning calorimeter and X-ray diffraction. Results revealed that Ti(C,N) was synthesized through the solid solution of carbon into TiN, and the addition of Co to Ti–C–BN mixtures promoted the production of Ti(C,N) by the formation of Co–Ti liquid.

Published
2016

11. Influence of applied pressure on the microstructure and properties of Ti(C,N)–TiB2–Co cermets prepared in situ by reactive hot-pressing

Author

Mengxian Zhang, Dun Wen Zuo, Feng Shangshen, Xianrui Zhao, and Feng Xu

Subjects
010302 applied physics, In situ, Materials science, Metallurgy, 02 engineering and technology, General Chemistry, Cermet, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Hot pressing, Microstructure, 01 natural sciences, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, 0210 nano-technology
Published
2016

15. Effect of ZrO2 whiskers on the microstructure and mechanical properties of a Ti(C,N)‐based cermet cutting tool material.

Author

Fang, Yihang, Zhao, Xianrui, Zhang, Mengxian, Zhang, Ping, Cheng, Hu, Xue, Shuangxi, Zhang, Li, Wu, Jianbo, and Feng, Shangshen

Subjects
CUTTING (Materials), CUTTING tools, SPECIFIC gravity, MICROSTRUCTURE, FLEXURAL strength, CRYSTAL whiskers
Abstract

ZrO2‐whisker‐reinforced Ti(C,N)‐based cermets were designed and prepared via a vacuum hot‐pressing process. The ZrO2 whisker characteristics and the phase, microstructure and mechanical properties of the cermets were investigated, and the relevant toughening mechanisms were examined. The results indicate that the ZrO2 whiskers retain their morphology and significantly improve the mechanical properties of the cermets. The relative density and hardness decreased slightly with increasing ZrO2 whisker content. At a whisker content of 7.5 wt.%, the fracture toughness and flexural strength reached their maximum values of 7.825 MPa·m1/2 and 1094 MPa, respectively. This enhancement in the mechanical properties is due to stronger bonding between the interfaces through dimples, tearing ridges and whisker pull‐out, in addition to the inhibition of crack propagation via crack deflection, crack branching and crack bridging. [ABSTRACT FROM AUTHOR]

Published
2019
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