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Your search keyword '"Yan, Liwen"' showing total 228 results
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228 results on '"Yan, Liwen"'

23. Preparation and Properties of Elastic Mullite Fibrous Porous Materials with Excellent High-Temperature Resistance and Thermal Stability.

Author

Zhang, Xiang, Zhang, Xueying, Wang, Zhongyan, Xue, Yunjia, Guo, Anran, Yan, Liwen, Hou, Feng, and Liu, Jiachen

Subjects
POROUS materials, ELASTICITY, THERMAL stability, THERMAL resistance, MULLITE, THERMAL insulation
Abstract

Mullite fiber felt is a promising material that may fulfill the demands of advanced flexible external thermal insulation blankets. However, research on the fabrication and performance of mullite fiber felt with high-temperature resistance and thermal stability is still lacking. In this work, mullite fibers were selected as raw materials for the fabrication of mullite fibrous porous materials with a three-dimensional net structure. Said materials' high-temperature resistance and thermal stability were investigated by assessing the effects of various heat treatment temperatures (1100 °C, 1300 °C, and 1500 °C) on the phase composition, microstructure, and performance of their products. When the heat treatment temperature was below 1300 °C, both the phase compositions and microstructures of products exhibited stability. The compressive rebound rate of the product before and after 1100 °C reached 92.9% and 84.5%, respectively. The backside temperature of the as-prepared products was 361.6 °C when tested at 1500 °C for 4000 s. The as-prepared mullite fibrous porous materials demonstrated excellent high-temperature resistance, thermal stability, thermal insulation performance, and compressive rebound capacity, thereby indicating the great potential of the as-prepared mullite fibrous porous materials in the form of mullite fiber felt within advanced flexible external thermal insulation blankets. [ABSTRACT FROM AUTHOR]

Published
2024
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24. High-Emissivity Double-Layer ZrB 2 -Modified Coating on Flexible Aluminum Silicate Fiber Fabric with Enhanced Oxidation Resistance and Tensile Strength.

Author

Li, Wei, Zhang, Xueying, Yan, Liwen, Guo, Anran, Du, Haiyan, and Liu, Jiachen

Subjects
SILICATE fibers, ALUMINUM silicates, TENSILE strength, THERMAL insulation, GLASS coatings, SURFACE coatings
Abstract

Fibers crystallize and become brittle at high temperatures for a long time, so the surface coating must maintain long-lasting emission performance, which requires superior antioxidant properties of the high-emissivity fillers. To improve the radiation performance of the coating and the tensile strength of the fiber fabric, a double-layer coating with high emissivity was prepared on the surface of flexible aluminum silicate fiber fabric (ASFF) using MoSi2 and SiC as emissive agents. The incorporation of borosilicate glass into the outer coating during high-temperature oxidation of ZrB2 results in superior encapsulation of emitter particles, effectively filling the pores of the coating and significantly reducing the oxidation rate of MoSi2 and SiC. Furthermore, the addition of an intermediate ZrO2 layer enhances the fiber bundle's toughness. The obtained double-coated ASFF exhibits an exceptionally high tensile strength of 57.6 MPa and a high bond strength of 156.2 kPa. After being subjected to a 3 h heating process, the emissivity exhibits a minimal decrease of only 0.032, while still maintaining a high value above 0.9. The thermal insulation composites, consisting of a flexible ASFF matrix and a ZrB2-modified double-layer coating, exhibit significant potential for broad applications in the field of thermal protection. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Thermal lithospheric thickness and bottom boundary morphology of the North China Craton after thermal subsidence

Author

Yan, Liwen, He, Lijuan, Wu, Jinhui, and Chen, Chaoqiang

Abstract

The present day’s thermal lithospheric thickness is usually calculated by one or two-dimensional steady-state heat conduction equation. Using the latest measured heat flow data of the North China Craton(NCC) and the one-dimensional steady-state heat conduction equation, the calculated thermal lithospheric thickness of the NCC is between 34.8-190 km. There are some regions, whose lithosphere is very thin, and the lithosphere adjacent to them is very thick, so the bottom boundary of the lithosphere fluctuates greatly. The last thinning of the NCC stopped at~24 Ma and then entered the thermal subsidence period. To study whether the fluctuates of the bottom boundary of the lithosphere can be maintained during the long-term thermal subsidence process, a thermal subsidence model was established. The modeling results show that after the thermal subsidence of 24 Ma, the fluctuates of the bottom boundary of the lithosphere are difficult to maintain, and the present day’s thermal lithospheric thickness of the NCC should not exceed 73 km, and the maximum surface heat flow value of the NCC is 75.6 mW·m-2 due to the deep thermal state. The high heat flows anomaly in the NCC is more caused by shallow activities and cannot reflect the deep thermal state. After correction, the current thermal lithospheric thickness of the North China craton is ~73-190 km, and the bottom boundary of the lithosphere changes gently., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

Published
2023

47. Thermal effect of Emeishan basalt on Paleo-heat flow of the Sichuan Basin: numerical modeling

Author

Wu, Jinhui, He, Lijuan, Yan, Liwen, and Chen, Chaoqiang

Abstract

The Sichuan Basin is an important hydrocarbon-bearing basin in China, and its southwestern part is located in the outer zone of the Emeishan Large Igneous Province. The thermal influence of Emeishan basalt on hydrocarbon development in the Sichuan Basin has been of great interest. Recent paleo-heat flow recovery calculations have yielded the presence of high paleo-heat flows greater than 100 mW/m2 duirng the Permian at some points in the basin, which are thought to be related to Emeishan basalt. In order to understand the causes of these high paleo-heat flows and the thermal effects of basaltic magma overflowing to the surface on the lower strata, the thermal effects of Emeishan basalt were simulated by 2D finite element method. The following conclusions are drawn: (1) The changes in surface heat flow generated by the intrusion of Emeishan basaltic magma into the bottom of the lithosphere and the bottom of the crust are both inconsistent with the high paleo-heat flow of >100 mW/m2 during the Permian of the Sichuan Basin, and magma intruded into the interior of the crust can cause such high paleo-heat flows.(2) The thermal disturbance caused by different thicknesses of magma at the surface to the lower strata at different depths was calculated. The thicker the magma at the surface and the shallower the overlying strata, the greater the thermal disturbance of the magma to the strata, while the adjacent strata are unaffected. The thermal influence on the hydrocarbon source rocks can thus be inferred., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

Published
2023

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