Mechanism of grain refinement and growth for the continuous alumina fibers by MgO addition

Wu, Chaozhong; Liu, Qiang; Chen, Rui; Wang, Juan; Liu, Wensheng; Yao, Shuwei; Ma, Yunzhu

doi:10.1016/j.ceramint.2022.11.025

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…Continuous alumina green fibers were prepared from the concentrated aluminum carboxylate and then combined with dry spinning. The preparation details were shown in our previous report 57,58 . Taking lanthanum nitrate hexahydrate as lanthanum source and adding lanthanum source in the solution reaction step, the addition amounts of lanthanum oxide (La2O3) were 0 wt.%, 0.25 wt.%, 0.5 wt.%, 0.75 wt.%, 1 wt.%, 3…”

Section: Sample Preparationmentioning

confidence: 99%

“…and Origin from more than 600 grains of alumina fibers to calculate their grain size distribution. The tests with respect to grain statistics and densities were also described in our previous report 57 . In order to investigate the microstructure and element distribution of grain boundaries, the FIB samples were prepared by double beam…”

Section: Microstructural Characterizationsmentioning

confidence: 99%

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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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Section: Sample Preparationmentioning

confidence: 99%

Section: Microstructural Characterizationsmentioning

confidence: 99%