Shouyang Zhang
Northwestern Polytechnical University
Composite numberPolarized light microscopyChemical vapor infiltrationIsothermal processCeramicComposite materialFlexural strengthMaterials scienceScanning electron microscopeLayer (electronics)CoatingPyrolysisChemical engineeringThermal expansionCarbonFiberChemical vapor depositionPyrolytic carbonReinforced carbon–carbonMicrostructureThermal conductivity
70Publications
19H-index
1,344Citations
Publications 71
Newest
Abstract High-entropy oxides (HEOs) are considered promising thermal barrier coating (TBC) materials due to their unique thermophysical performances induced by the entropy effects. In this work, (La0.2Ce0.2Pr0.2Sm0.2Eu0.2)2Hf2O7 high entropy hafnate, as a thermal barrier coating (TBC) material, was successfully synthesized by solution combustion method for the first time. From the X-ray diffraction, scanning electron microscopy, and transmission electron microscopy results, it is confirmed that ...
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#1Tiyuan WangH-Index: 5
#2Hejun LiH-Index: 68
Last. Shouyang ZhangH-Index: 19
view all 7 authors...
The microstructure of pyrolytic carbon significantly affects the performance of aircraft brake discs. In this study, to explore the effect of precursor on the microstructure of pyrocarbon, two types of pyrocarbon films were grown on the quartz glass substrates by isothermal isobaric chemical vapor infiltration using methane and acetaldehyde as precursors. The microstructures of both the films and their formation mechanisms were investigated and compared. The thicknesses of the pyrocarbon films f...
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#1Tiyuan Wang (NPU: Northwestern Polytechnical University)H-Index: 5
#2Qiang Song (NPU: Northwestern Polytechnical University)H-Index: 26
Last. Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
view all 8 authors...
Abstract Carbon fiber (CF)/epoxy composites with hybrid nanofillers were prepared by electrophoretic deposition (EPD) of silicon carbide nanowires (SiCnws) on CFs, followed by in-situ grafting of graphene via chemical vapor deposition (CVD). The effects of SiC nanowires/graphene hybrid nanofillers on interlaminar shear strength (ILSS), flexural property, and through-thickness thermal conductivity of CF/epoxy composites were investigated. Due to the incorporation of SiCnws and graphene, the inter...
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#1Song Tian (Chongqing Jiaotong University)H-Index: 6
#2Yulei Zhang (NPU: Northwestern Polytechnical University)H-Index: 31
Last. Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
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Abstract HfC nanowires modified carbon fiber cloth laminated carbon/carbon (HfCnw-C/C) composites were fabricated by in situ growth of HfC nanowires on carbon cloths via catalytic CVD, followed with lamination of the cloths and densification by pyrolytic carbon (PyC). Morphologies, thermal conductivity, coefficient of thermal expansion (CTE), and ablation resistance of the composites were investigated. Due to the loading of HfC nanowires, the matrix PyC with low texture was obtained; the thermal...
1 CitationsSource
#1Tiyuan Wang (NPU: Northwestern Polytechnical University)H-Index: 5
#2Shouyang Zhang (NPU: Northwestern Polytechnical University)H-Index: 19
Last. Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
view all 6 authors...
Abstract The present study explored the effect of medium texture (MT) content on flexural properties and thermal expansion coefficients (CTES) of carbon/carbon (C/C) composites with multilayered pyrolytic carbon. The specimen with 39% MT exhibited maximum flexural strength of 221.55 MPa, increasing by 52% compared with pure high texture. While the flexural strength decreased when the MT content exceeded 39%. The excellent strength can be attributed to crack deflection between multilayered textur...
2 CitationsSource
#1Tiyuan Wang (NPU: Northwestern Polytechnical University)H-Index: 5
#2Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
Last. Shouyang Zhang (NPU: Northwestern Polytechnical University)H-Index: 19
view all 7 authors...
Abstract In order to explore the dependence of mechanical properties on the microstructure of high-textured (HT) pyrolytic carbon (PyC), the microstructure and properties of HT PyC specimens prepared by isothermal isobaric chemical vapor infiltration (ICVI) and thermal gradient chemical vapor infiltration (TCVI) processes were investigated. The HT PyC of ICVI was uniform and exhibited a more distinct long-range order compared to that of TCVI. Besides, a spatial gradient in texture existed within...
9 CitationsSource
#1Tiyuan Wang (NPU: Northwestern Polytechnical University)H-Index: 5
#2Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
Last. Wei Li (NPU: Northwestern Polytechnical University)H-Index: 99
view all 5 authors...
Abstract In order to investigate the effect of microstructural evolution on the micromechanical behavior of pyrolytic carbon (PyC), the microstructural parameters and evolution of high texture (HT) and medium texture (MT) PyC after heat treatment from 1600 °C to 2450 °C were studied comparatively. The micro-indentation test was also performed to reveal the micromechanics. In terms of microstructure, after heat treatment, the HT matrix was directly delaminated into many nano-layers accompanied by...
4 CitationsSource
#1Chunxia Hu (NPU: Northwestern Polytechnical University)H-Index: 3
#2Hejun Li (NPU: Northwestern Polytechnical University)H-Index: 68
Last. Ni Li (California State University, Los Angeles)H-Index: 1
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A complete mechanism of methane pyrolysis is proposed for chemical vapor infiltration of pyrocarbon with different textures, which contains a detailed homogeneous mechanism for gas reactions and a lumped heterogeneous mechanism for pyrocarbon deposition. This model is easily applied to simulate gas compositions and pyrocarbon deposition in a vertical hot-wall flow reactor in the temperature range of 1,323–1,398 K without any adjusting parameters and presents better results than previous mechanis...
3 CitationsSource
#1Shengyue Gu (NPU: Northwestern Polytechnical University)H-Index: 7
#2Shouyang Zhang (NPU: Northwestern Polytechnical University)H-Index: 19
Last. Wei Li (NPU: Northwestern Polytechnical University)H-Index: 206
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Abstract Y 2 Hf 2 O 7 possesses low thermal conductivity and high melting point, which make it promising for a new anti-ablation material. For evaluating the thermal stability and the potential applications of Y 2 Hf 2 O 7 on anti-ablation protection of C/C composites, Y 2 Hf 2 O 7 ceramic powder was synthesized by solution combustion method and Y 2 Hf 2 O 7 coating was prepared on the surface of SiC coated C/C composites using SAPS. Results shown that the coating exhibits good ablation resistan...
9 CitationsSource
#1Shengyue Gu (NPU: Northwestern Polytechnical University)H-Index: 7
#2Shouyang Zhang (NPU: Northwestern Polytechnical University)H-Index: 19
Last. Wei Li (NPU: Northwestern Polytechnical University)H-Index: 99
view all 5 authors...
Abstract Y2Hf2O7 coating was prepared by SAPS on the surface of SiC coated C/C composites with distinct spraying power. The effect of spraying power on the microstructure, phase composition and bonding force was investigated. Meanwhile, thermal shock test has been conducted to evaluate the performance of the coating in extreme environments. Results show that Y2Hf2O7 coating prepared under 50 kW possesses optimal microstructure and combination state. The bonding force of the interface between Y2H...
3 CitationsSource