Abstract
Observation of melt instability during the growth of Ti: Al 2O 3 fibres by the laser-heated miniature pedestal growth technique is reported. This instability takes the form of oscillations of the melt temperature and free surface, with a frequency of 0.68 Hz. The onset of oscillation has been found to depend on the Ti concentration [Ti] and its source is attributed to oscillatory convention, likely to be Marangoni in nature, arising from changes in the melt surface tension properties due to the presence of Ti. Under typical growth conditions an upper limit of [Ti] has been found for stable growth. This has been calculated to be 5.8±0.5 wt %.
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