Development of mullite fibers and novel zirconia-toughened mullite fibers for high temperature applications

Reinders, Leonie; Pfeifer, Stephanie; Kröner, Sarah; Stolpmann, Heiko; Renfftlen, Achim; Greiler, L. Charlyn; Clauß, Bernd; Buchmeiser, Michael R.

doi:10.1016/j.jeurceramsoc.2020.12.048

Cited by 31 publications

(10 citation statements)

References 38 publications

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“…Different types of alumina-silica fibers have been profusely studied and used in oxide/oxide composites. [14][15][16] For typical alumina-silica fiber (ALF 2880D) composed of γ-A1 2 O 3 , amorphous SiO 2 and B 2 O 3 , the tensile strength degraded remarkably from 1.37 to .82 GPa as the heat exposure temperature increased from 1200 to 1300 • C. 17 The Young's modulus and tensile strength of another aluminasilica fiber (ALF 2220S) were both degraded remarkably from 145 to 110 GPa, and from 1.03 to .52 GPa, respectively, as the heat-treatment temperature increased from 1200 to 1400 • C. 18 Gai et al prepared an aluminum oxide-mullitehafnium oxide composite ceramic fiber and characterized its high temperature property, the results showed that the tensile strength retention was 75.48% and 71.49% after heat treatment at 1100 and 1200 • C for .5 h, respectively, and was 61.57% after heat treatment at 1100 • C for 5 h. 19 Zhang et al studied the room-temperature strength of an alumina fiber after treating at different temperatures, and observed the fibers maintained a tensile strength of 1.2 GPa after heating below 1200 • C, but after heating over 1200 • C, the strength remained only about 60%. 20 Scholz et al reported the development of an aluminosilicate fiber with mullite composition and found that thermal treatment was delicate in terms of microstructure formation of the fiber, filaments with a maximum sintering temperature of 1300 • C showed higher tensile strength compared to those sintered at 1350 • C. 21 It can be seen that high temperature exposure has a great influence on the properties of alumina-silica fibers.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal exposure on the microstructure and strength of an alumina‐silica ceramic fiber

Yang

Zhao

Sun

et al. 2023

Int J Applied Ceramic Tech

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The microstructure and mechanical properties of an alumina‐silica ceramic fiber after thermal exposure at 1100–1300°C were investigated by X‐ray diffraction, nuclear magnetic resonance, scanning electron microscopy, transmission electron microscopy analyses and room temperature tensile strength test. The results showed that the fiber was composed of γ‐A12O3 and amorphous SiO2. A phase reaction of γ‐A12O3 and amorphous SiO2 occurred when thermal exposure temperature exceeded 1150°C, and a new mullite phase formed. The grain size of the newly formed mullite increased with the increase of exposure temperature. Both the phase transition and grain growth of mullite had a significant impact on the mechanical properties of the fiber. Tensile strength of the fiber decreased slightly when thermal exposure temperature was below 1150°C, while the strength retention of the fiber decreased sharply to 65.36% as exposure temperature rose to 1200°C. A higher dispersion of tensile strength was also observed at higher exposure temperatures, as revealed by the Weibull statistical model.

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Section: Introductionmentioning

confidence: 99%

Effect of thermal exposure on the microstructure and strength of an alumina‐silica ceramic fiber

Yang

Zhao

Sun

et al. 2023

Int J Applied Ceramic Tech

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“…However, due to the presence of organic ligands in the precursors, their decomposition during heat treatment tends to destroy the structure of the fibers, which is the main reason for the difficulty in obtaining high-performance continuous fibers. Although researchers have prepared a series of high-temperature-resistant oxide submicron fibers and continuous fibers such as Al 2 O 3 [22], ZrO 2 [23][24][25][26], HfO 2 [27], TiO 2 [28], Y 2 O 3 [29], SiO 2 [30,31], mullite [32,33], Al 2 TiO 5 [34], and Y 3 Al 5 O 12 [35] through the precursor method. Due to the large differences in the structure of ligands, metal element types, and fiber diameters, the heat treatment methods of various fibers are also very different.…”

Section: Introduction mentioning

confidence: 99%

Development of lutetium oxide continuous fibers with excellent mechanical properties

Xie¹,

Peng²,

WANG³

et al. 2023

Journal of Advanced Ceramics

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The difficulty of reducing the diameter of lutetium oxide (Lu 2 O 3 ) continuous fibers below 50 μm not only limits the flexibility of the sample but also seriously affects their application and development in high-energy lasers. In this work, a Lu-containing precursor with high ceramic yield was used as raw material, fiberized into precursor fibers by dry spinning. The pressure-assisted water vapor pretreatment (PAWVT) method was creatively proposed, and the effect of pretreatment temperature on the ceramization behavior of the precursor fibers was studied. By regulating the decomposition behavior of organic components in the precursor, the problem of fiber pulverization during heat treatment was effectively solved, and the Lu 2 O 3 continuous fibers with a diameter of 40 μm were obtained. Compared with the current reported results, the diameter was reduced by about 50%, successfully breaking through the diameter limitation of Lu 2 O 3 continuous fibers. In addition, the tensile strength, elastic modulus, flexibility, and temperature resistance of Lu 2 O 3 continuous fibers were researched for the first time. The tensile strength and elastic modulus of Lu 2 O 3 continuous fibers were 373.23 MPa and 31.55 GPa, respectively. The as-obtained flexible Lu 2 O 3 continuous fibers with a limit radius of curvature of 3.5-4.5 mm had a temperature resistance of not lower than 1300 ℃, which established a solid foundation for the expansion of their application form in the field of high-energy lasers.

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“…However, current commercial continuous alumina fibers with fine-grained microstructures cannot meet the growing demand in markets and aerospace, such as long-term use in higher temperatures, steam, and other environments 19,20 . In fact, one commonly retorts to adding the second phase to improve the high-temperature stability of alumina fibers 8,[20][21][22][23][24][25][26] . Although the high-temperature resistance of the second-phase doped alumina fibers fabricated by these methods is improved, their tensile properties are greatly reduced compared to those of pure alumina fibers [27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Towards achieving ultrahigh thermal stability of fine-grained alumina fibers via segregation-induced ordered superstructures

Liu

et al. 2023

Preprint

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High-strength materials often rely on their fine crystal structure, but the tendency of these crystals to coarsen at high temperatures poses a significant challenge in cutting-edge fields. Enhancing thermal stability while maintaining mechanical properties has become a complex issue in material development. In alumina ceramic fibers, we had observed that the ordered superstructures induced by segregation at the grain boundary networks of α-Al2O3 significantly enhanced the thermal stability of alumina grains without compromising their tensile strength. This led to a remarkable increase in heat-resistant temperature for fine alumina grains, which could exceed 1250 °C and thus greatly expanded the upper limit of alumina materials in high-temperature fields. Simultaneously, the phase-field simulation revealed that ordered superstructures likely reduced alumina's grain boundary diffusion coefficient to nearly match its volume diffusion coefficient. It was foreseeable that these structures would become a promising strategy for enhancing the high-temperature stability of alumina ceramic materials in the future.

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Development of mullite fibers and novel zirconia-toughened mullite fibers for high temperature applications

Cited by 31 publications

References 38 publications

Effect of thermal exposure on the microstructure and strength of an alumina‐silica ceramic fiber

Effect of thermal exposure on the microstructure and strength of an alumina‐silica ceramic fiber

Development of lutetium oxide continuous fibers with excellent mechanical properties

Towards achieving ultrahigh thermal stability of fine-grained alumina fibers via segregation-induced ordered superstructures

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