Microtopographic evolution and damage characteristics of sapphire fiber under high temperatures
DOI:
10.1364/ao.545536
Publication Date:
2025-01-06T21:00:23Z
AUTHORS (8)
ABSTRACT
Sapphire fibers exposed to air exhibit performance degradation during
high-temperature in-situ testing.
Therefore, analyzing the damage characteristics of sapphire fibers
under high-temperature conditions and developing effective protective
measures are essential. This study investigates the damage
characteristics and microtopographic evolution of sapphire fibers
annealed at temperatures ranging from 1400°C to 1600°C, with 100°C
intervals. The high-temperature damage characteristics of the sapphire
fibers were analyzed using a size threshold filtering method combined
with thresholding and connected component labeling techniques. The
results indicate that both the size and density of bubble-like damage
on the sapphire fiber increase with higher annealing temperatures.
Furthermore, the O: Al (oxygen: aluminum) ratio was calculated to
study the high-temperature damage products of the sapphire fibers. The
findings suggest that the damaged products exist as a mixture of
hydrated alumina. Additionally, transverse etched lines, initially
present on the pristine sapphire fiber surface, transform into
longitudinal etched lines during annealing due to the release of
internal stress. The width of these longitudinal etched lines
increases progressively with higher annealing temperatures. To prevent
damage at high temperatures, a vacuum annealing method was employed,
and gradient annealing effectively suppressed the expansion of etched
lines. This study provides further insight into the damage mechanisms
and microtopography evolution of sapphire fibers under
high-temperature conditions while also providing a theoretical
foundation for the packaging and protective technologies used in
high-temperature applications of sapphire fibers.
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