492
Y. V. Naidich et al.
Fig. 31.3 Leucosapphire area covered by titanium film dependence on annealing time at various
temperatures (1300–1600
◦ ´)
Figure 31.5 shows diagrams for kinetics of disintegration of titanium film
deposited onto zirconium dioxide surface during its annealing at different temperatures within 1400 ÷ 1600
◦ C range with exposition at each temperature from 2 to
20 min.
During the annealing of a zirconium film at a leucosapphire surface, the first
changes in the structure of the film in the form of small cracks appeared only after 5min annealing at 1400
◦ C. The number of cracks increased after 10 min of exposure
at that temperature, and, after 20-min annealing, the zirconium film was already
noticeably dispersed (Fig. 31.6a). After 2-h annealing at 1500
◦ C, the film began to
disperse, and, at the same time, long but not wide cracks appeared in it. A further
increase of the annealing time at this temperature up to 5 and 10 min intensified the
process of cracking and dispersion of the nanofilm which significantly intensified
after a 20-min exposure (Fig. 31.6b). As a result of annealing at 1600
◦ C, the film
began to be dispersed vigorously from the first minutes of annealing, i.e., from 2 to
5 min of exposure. After 10 min of annealing at 1600
◦ C, the film was dispersed
almost completely (Fig. 31.6c), and the process of its decomposition after 20-min
exposure was completed when the film residues covered only about 20% of the
surface of the leucosapphire (Fig. 31.7).
Figure 31.7 shows diagrams for kinetics of disintegration of zirconium film
on the leucosapphire surface during its annealing at different temperatures
(1400 ÷ 1600
◦ C) with exposition at each temperature from 2 up to 20 min.
The initial zirconium film at the zirconium dioxide (single crystal) surface
remained solid up to 5-min annealing at 1400
◦ C, with only isolated cracks in it
apparently due to the difference in the thermal coefficients of the linear expansion
Y. V. Naidich et al.
Fig. 31.3 Leucosapphire area covered by titanium film dependence on annealing time at various
temperatures (1300–1600
◦ ´)
Figure 31.5 shows diagrams for kinetics of disintegration of titanium film
deposited onto zirconium dioxide surface during its annealing at different temperatures within 1400 ÷ 1600
◦ C range with exposition at each temperature from 2 to
20 min.
During the annealing of a zirconium film at a leucosapphire surface, the first
changes in the structure of the film in the form of small cracks appeared only after 5min annealing at 1400
◦ C. The number of cracks increased after 10 min of exposure
at that temperature, and, after 20-min annealing, the zirconium film was already
noticeably dispersed (Fig. 31.6a). After 2-h annealing at 1500
◦ C, the film began to
disperse, and, at the same time, long but not wide cracks appeared in it. A further
increase of the annealing time at this temperature up to 5 and 10 min intensified the
process of cracking and dispersion of the nanofilm which significantly intensified
after a 20-min exposure (Fig. 31.6b). As a result of annealing at 1600
◦ C, the film
began to be dispersed vigorously from the first minutes of annealing, i.e., from 2 to
5 min of exposure. After 10 min of annealing at 1600
◦ C, the film was dispersed
almost completely (Fig. 31.6c), and the process of its decomposition after 20-min
exposure was completed when the film residues covered only about 20% of the
surface of the leucosapphire (Fig. 31.7).
Figure 31.7 shows diagrams for kinetics of disintegration of zirconium film
on the leucosapphire surface during its annealing at different temperatures
(1400 ÷ 1600
◦ C) with exposition at each temperature from 2 up to 20 min.
The initial zirconium film at the zirconium dioxide (single crystal) surface
remained solid up to 5-min annealing at 1400
◦ C, with only isolated cracks in it
apparently due to the difference in the thermal coefficients of the linear expansion