研究目的
To synthesize hollow ZrO2 ?bers with low thermal conductivity and high phase stability using a cogon ?ber template, leveraging its hollow structure and amorphous silicon and silicates content to improve thermal insulation and prevent phase transitions.
研究成果
Hollow ZrO2 ?bers with low thermal conductivity and high phase stability were successfully synthesized using a cogon ?ber template. The hollow structure reduced thermal conductivity, and amorphous silicon and silicates from the template prevented phase transitions at room temperature and in humid environments, enhancing mechanical stability. This method offers a new approach for designing heat-insulating materials.
研究不足
The study is limited to speci?c sintering conditions (1000°C, 1 h) and Y2O3 doping levels up to 8 mol%. The use of natural cogon ?bers may introduce variability in composition. Aging tests were conducted only at 134°C for 6 h, which may not cover all real-world conditions. Optimization of parameters like sintering temperature and time could be explored further.
1：Experimental Design and Method Selection:
The study used a template method with natural cogon ?bers to fabricate biomorphic ZrO2 ?bers. Zirconium oxychloride octahydrate and yttrium nitrate hexahydrate were dissolved in aqueous ethanol to form a precursor solution. Cogon ?bers were immersed in this solution, dried, and sintered to obtain the ?bers.
2：Sample Selection and Data Sources:
Natural cogon ?bers were selected as the template. Various molar ratios of Y2O3 doping (0-8 mol%) were tested.
3：List of Experimental Equipment and Materials:
Equipment included a vacuum drying chamber, mu?e furnace, XRD (Bruker-AXS D8 Advance), SEM (Quanta 250 FEG), TEM (2100F), thermal conductivity measuring apparatus (DRS-III), mercury porosimeter (PoreMaster-60 GT), EDS (Oxford), XPS (ESCALAB 250XI), TG-DSC (SDT Q600), FTIR (Magna 560), and universal testing machine (CMT5105). Materials included ZrOCl2·8H2O, Y(NO3)3·6H2O, cogon ?bers, and ethanol.
4：5). Materials included ZrOCl2·8H2O, Y(NO3)3·6H2O, cogon ?bers, and ethanol. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Cogon ?bers were immersed in precursor solution for 1 h, dried at 60°C for 12 h, and sintered at 1000°C for 1 h at 10°C/min. Characterization involved phase analysis, microstructure observation, thermal conductivity measurement, pore size distribution, EDS, XPS, TG-DSC, FTIR, and mechanical testing.
5：Data Analysis Methods:
XRD for phase identi?cation, SEM/TEM for morphology, thermal conductivity apparatus for heat properties, mercury porosimeter for pore analysis, EDS/XPS for elemental composition, TG-DSC for thermal behavior, FTIR for chemical bonds, and universal testing machine for mechanical strength.
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X-ray diffractometer
D8 Advance
Bruker
Phase analysis of biomorphic ZrO2 fibers
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Scanning electron microscope
Quanta 250 FEG
FEI
Microstructure observation of fibers
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Transmission electron microscope
2100F
Joel
High-resolution imaging and diffraction analysis
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X-ray photoelectron spectroscopy
ESCALAB 250XI
Thermo
Binding energy characterization of elements
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Thermal conductivity measuring apparatus
DRS-III
Xiang Ke Yi Qi
Measurement of thermal conductivity at various temperatures
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Mercury porosimeter
PoreMaster-60 GT
Quantachrome
Pore size distribution measurement
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Energy dispersive X-ray spectroscopy
Oxford
Elemental composition and distribution analysis
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Thermogravimetric-differential scanning calorimeter
SDT Q600
TA
TG-DSC analysis for thermal behavior
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Fourier transform infrared spectrometer
Magna 560
Nicolet Instrument Corporation
FTIR analysis for chemical bonds
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Universal testing machine
CMT5105
SANS
Compressive strength measurement
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