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Your search keyword '"Sun, Zhiyuan"' showing total 88 results
Start Over Author "Sun, Zhiyuan" Publisher elsevier bv
88 results on '"Sun, Zhiyuan"'

34. High temperature anti-oxidative and tunable wave absorbing SiC/Fe3Si/CNTs composite ceramic derived from a novel polysilyacetylene

Author

Wen Yang, Sun Zhiyuan, Guangwu Wen, Bo Xiao, Y.F. Hou, Songsong Wu, Xiaoxiao Huang, and Shuai Qi

Subjects
Electromagnetic field, Materials science, Composite number, Nanoparticle, 02 engineering and technology, Carbon nanotube, 01 natural sciences, law.invention, law, 0103 physical sciences, Materials Chemistry, Ceramic, Composite material, 010302 applied physics, chemistry.chemical_classification, Process Chemistry and Technology, Reflection loss, Polymer, 021001 nanoscience & nanotechnology, Microstructure, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry, visual_art, Ceramics and Composites, visual_art.visual_art_medium, 0210 nano-technology
Abstract

With the rapid development of high power electromagnetic (EM) equipment and high-speed aircraft, the powerful and high oxidation-resistance absorbers are fundamentally desirable for the EM field. Herein, a novel high temperature anti-oxidative SiC/Fe3Si/CNTs composite is synthesized by a facile polymer derived ceramic (PDC) route from a Fe-containing polysilyacetylene (PSA). The microstructure of as-prepared SiC/Fe3Si/CNTs composite absorber is featured by micro-sized SiC ceramic grains with spherical Fe3Si nanoparticles and carbon nanotubes (CNTs) attached to. The vector network analyzer tests show a tunable wave-absorbing performance by adjusting the thickness of layer, and the effective bandwidth (the reflection loss

Published
2019

49. Preparation of high performance soft magnetic alloy Fe-4Si-0.8P by metal injection molding

Author

Fei Fang, Xuanhui Qu, Sun Zhiyuan, Lu Huifeng, Rui Li, Ma Jidong, and Mingli Qin

Subjects
010302 applied physics, Full density, Materials science, General Chemical Engineering, Metallurgy, Sintering, 02 engineering and technology, Coercivity, 021001 nanoscience & nanotechnology, 01 natural sciences, Metal injection molding, Mechanics of Materials, Electrical resistivity and conductivity, Permeability (electromagnetism), 0103 physical sciences, Magnetic alloy, 0210 nano-technology, Saturation (magnetic)
Abstract

Fe-4Si-0.8P soft magnetic alloy was prepared by metal injection molding (MIM). Ferrophosphorus liquid phase sintering promoted densification and enhanced magnetic properties. The sample with nearly full density, the saturation induction of 1.59 T, maximum permeability of 2467, coercive force of 130 A/m and resistivity of 81.2 μΩ·cm was obtained at 1300 °C for 4 h. Competitive properties contributed toward achieving low magnetic losses. Therefore, MIM Fe-4Si-0.8P can be widely used in the field of magnetic materials.

Published
2017

50. Material removal mechanism in ultrasonic vibration assisted polishing of micro cylindrical surface on SiC

Author

Bing Guo, Qingliang Zhao, and Sun Zhiyuan

Subjects
0209 industrial biotechnology, Materials science, Scanning electron microscope, Mechanical Engineering, Abrasive, Diamond, Polishing, 02 engineering and technology, engineering.material, 021001 nanoscience & nanotechnology, Industrial and Manufacturing Engineering, Vibration, 020901 industrial engineering & automation, Machining, Lubrication, engineering, Surface roughness, Composite material, 0210 nano-technology
Abstract

In consideration of the high hardness of the mold insert material SiC, ultrasonic vibration was introduced in the abrasive polishing (AP) of the linear micro cylindrical surface aiming to enhance the surface quality while improving the machining efficiency. However, the interaction behavior in between the material and polishing tool under ultrasonic vibration has not been studied so far. In this paper, the material removal mechanism of ultrasonic vibration assisted polishing (UVAP) on micro cylindrical SiC surface was investigated to fulfill a fundamental understanding of this process in comparison to the conventional polishing without employing ultrasonic vibration. The collection method of high frequency friction forces was firstly proposed to analyze the friction behavior on the SiC cylindrical surface. Then the relationship between ultrasonic vibration, friction force and micro cylindrical surface quality was studied respectively. The experimental results indicated that when the ultrasonic vibration was applied, the friction force decreased accordingly corresponding to a better surface quality. In addition, the lubrication condition was discussed in UVAP process based on the establishment of the stribeck curve. Furthermore, the wear coefficients were calculated through measuring the material removal depth, the surface morphologies were measured by a scanning electron microscopy in revealing the different material removal modes under various different polishing parameters. Through computation and analysis, it shows that the lower polishing force and relative lower speed as well as the higher vibration frequency and amplitude could result in a lower surface roughness and less polishing marks of micro cylindrical surface on SiC. Finally, the cylindrical arrays were successfully polished with the optimized parameters on precision diamond ground SiC surfaces.

Published
2016

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