Method for altering color of white coral by laser
A coral and laser technology, used in special decorative structures, decorative arts, clothing, etc., can solve the problems of cumbersome dyeing process, easy to fall off, and cannot be stored for a long time.
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Embodiment 1
[0022] Cut the white coral into thin slices with a thickness of 1mm with a crystal cutter, and then clean the surface with an ultrasonic cleaner;
[0023] Place the white coral sample on the rotating platform, and use the laser as the heat source for irradiation preheating. The single-sided scanning irradiation method is adopted. The laser spot area covers the entire surface of the white coral sample. The rotation speed of the rotating platform is 24rad / min. The warm-up time is 60s, and the power density of the laser is 9w / cm 2 ;
[0024] After preheating, increase the power density of the laser to 16w / cm 2 After continuing to irradiate for 120s, turn off the laser light source, cool to room temperature in the air, and process a light brown-red coral sample.
[0025] It can be seen from Figure 1 that the characteristic peaks of the Raman spectrum of white coral before laser irradiation (figure b) almost completely correspond to the Raman spectrum of calcite minerals; white c...
Embodiment 2
[0027] Cut the white coral into thin slices with a thickness of 1.5mm with a crystal cutter, and then clean the surface with an ultrasonic cleaner;
[0028] Put the white coral sample on the rotating platform, and use the laser as the heat source for irradiation preheating. The irradiation adopts a single-sided scanning irradiation method. The laser spot area covers the entire surface of the white coral sample. The rotation speed of the rotating platform is 24rad / min. The irradiation preheating time is 40s, and the laser power density is 10w / cm 2 ;
[0029] After preheating, increase the power density of the laser to 18w / cm 2 After continuing to irradiate for 60 s, turn off the laser light source, cool to room temperature in the air, and process a light brown-red coral sample.
[0030] It can be seen from Figure 2 that the change of Raman spectrum reflects the structural change inside the coral, which leads to the change of diffraction. As shown in the X-ray diffraction dia...
Embodiment 3
[0032] Cut the white coral into thin slices with a thickness of 2mm with a crystal cutter, and then clean the surface with an ultrasonic cleaner;
[0033] Put the white coral sample on the rotating platform, and use the laser as the heat source for irradiation preheating. The irradiation adopts a single-sided scanning irradiation method. The laser spot area covers the entire surface of the white coral sample. The rotation speed of the rotating platform is 24rad / min. The irradiation warm-up time is 45s, and the laser power density is 8w / cm 2 ;
[0034] After preheating, increase the power density of the laser to 17w / cm 2 After continuing to irradiate for 60 s, turn off the laser light source, cool to room temperature in the air, and process a light brown-red coral sample.
[0035] It can be seen from Figure 3 that the surface morphology of white coral after laser irradiation shows that the surface quality is improved, there is no microstructural damage such as particle impuri...
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