Zhang Zhiyi’s research while affiliated with North University of China and other places

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Publications (7)


DEVELOPMENT AND APPLICATION OF ULTRASONIC INSPECTION EQUIPMENT FOR THE WELD OF STEAM GENERATOR OUTLET NOZZLE IN AP1000 NPP
  • Article

December 2019

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16 Reads

The Proceedings of the International Conference on Nuclear Engineering (ICONE)

ZHU Xingli

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ZHOU Lifeng

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ZHANG Zhiyi

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Cai Jiafan

For AP1000 NPP, the connection weld between the steam generator and main pump is the only butt weld for the main equipment. This weld works in high temperature, high pressure, high vibration etc.. It has important significance and necessity to ensure its integrity by in-service inspection. The outlet nozzle of the steam generator is a highly radioactive area and is usually inspected from the outside. According to requirements of ASME-2004, ultrasonic inspection should be carried out more than 1/3 of thickness from inner wall , so ultrasonic probes must approach the weld from inner wall of the nozzle, one kind of special inspection equipment should be developed. It is difficult to design the inspection equipment because of the high irradiation environment, risk of internal contamination, small inlet size for equipment, large nozzle diameter to be inspected. Besides, it has a long distance between equipment installation and inspected weld, and is crossed-axis in space. In order to meet inspection needs, developed inspection equipment has 10 moving joints and multiple parts, each part is connected by fast connection structure. Installation personnel install inspection equipment outside of the steam generator manhole, then remotely control 10 moving joints to achieve inspection equipment's carrying, positioning, fixing and scan process, completing ultrasonic testing of the weld internally. Inspection equipment has been applied to Unit 1 and 2 of Sanmen NPP and Unit 2 of Haiyang NPP in China.


The schematic synthesis process for the FeNi/rGO nanocomposites
a XRD patterns of GO, FeNi alloys, and FeNi/rGO nanocomposites. b Raman spectra of GO and FeNi/rGO nanocomposites
XPS spectra of FeNi/rGO nanocomposites. a Survey spectrum; b Fe 2p spectrum; c Ni 2p spectrum; d C 1s spectrum
SEM microscopy of a pure FeNi alloys and b FeNi/rGO nanocomposites
The frequency dependence of complex permittivity (a, b) and complex permeability (c, d) for the pure FeNi alloys and FeNi/rGO nanocomposites

+4

The Distinctly Enhanced Electromagnetic Wave Absorption Properties of FeNi/rGO Nanocomposites Compared with Pure FeNi Alloys
  • Article
  • Publisher preview available

February 2019

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117 Reads

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18 Citations

Journal of Superconductivity and Novel Magnetism

An Dong

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Zhang Zhiyi

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Wang Yanhui

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[...]

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Liu Yaqing

FeNi/rGO nanocomposites were successfully synthesized by a facile one-pot method and demonstrated via powder X-ray diffraction, Raman spectra, X-ray photoelectron spectroscopy, and the scanning electron microscope. The electromagnetic wave absorption properties of the FeNi/rGO nanocomposites exhibit enhanced properties and wide absorption bandwidth compared with that of FeNi alloys. The minimum reflection loss of FeNi/rGO nanocomposites with a thickness of 3.0 mm can reach − 39.86 dB at 11.12 GHz, and the absorption bandwidth is up to 4 GHz. It is believed that the FeNi/rGO nanocomposites can be a best candidate for excellent electromagnetic wave-absorbing materials and widely used in practice. © 2018 Springer Science+Business Media, LLC, part of Springer Nature

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Effect of carbon black nature on dynamic mechanical properties and reinforcement of NR vulcanization by latex techniques

January 2017

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87 Reads

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4 Citations

Rubber Chemistry and Technology

The influence of the structure and size of carbon black on the static mechanical and dynamic mechanical properties of filled natural rubber (NR) compounds is investigated in detail. A new process for the production of carbon black master batches with enhanced mechanical properties has been developed. The unit operations in the process are the preparation of carbon black slurry in the presence of a suitable surfactant, addition of the slurry to the fresh NR latex under stirring, coagulation of the mixture by the addition of acid, dewatering of the coagulum, and drying to obtain carbon black–incorporated NR. The competence of the new technique is established by comparing the characteristics of the carbon black–incorporated NR by the mill mixing process (control). The mechanical properties, including tensile strength, modulus, tear strength, and hardness, are superior for the vulcanization prepared by the latex-suspension coagulation techniques. The improvement shown by the vulcanization prepared by...

Citations (2)


... The magnetic materials mainly include pure metal (iron, cobalt and nickel, etc.), metal oxides (iron oxide, ferrite and nickel oxide, etc.) and metal alloys (iron-cobalt alloy, iron-nickel alloy and cobalt-nickel alloy, etc.). FeNi alloy exhibits excellent initial permeability, relative permeability, as well as low coercivity and repeated magnetization loss, and shows great potentials in EMI shielding applications [34][35][36]. ...

Reference:

High-Efficiency Electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular Honeycomb Structures
The Distinctly Enhanced Electromagnetic Wave Absorption Properties of FeNi/rGO Nanocomposites Compared with Pure FeNi Alloys

Journal of Superconductivity and Novel Magnetism

... Using a similar strategy, Dong et al. [27] were able to effectively diminish the interaction between carbon blacks and improve the interaction between carbon blacks and rubber molecule chains, hence improving the dispersion of carbon blacks. Furthermore, it was shown that while the hardness and elongation at break showed the opposite pattern, the mechanical characteristics increased first and then dropped as the size of the carbon black particles increased. ...

Effect of carbon black nature on dynamic mechanical properties and reinforcement of NR vulcanization by latex techniques
  • Citing Article
  • January 2017

Rubber Chemistry and Technology