Since Sc2O3 products have unique physicochemical properties, they have achieved good application development in many high-tech and industrial sectors since the 1980s. At present, Sc2O3 has been widely used in the fields of alloys, electric light sources, catalysts, activators and ceramics.
Application in alloys
At present, aluminum scandium alloy has the advantages of low density (Sc of 3.0 g/cm3, Al of 2.7 g/cm3), high strength, high hardness, good plasticity, corrosion resistance and thermal stability. Therefore, it has been well used in structural parts such as missiles, aerospace, automobiles, and ships. And it has gradually turned to civilian applications, such as sports devices (hockey and baseball bats), computers and mobile phone shells. As a result, aluminum scandium alloy is of practical value.
Scandium plays a role in metamorphism and grain refinement in the alloy, which makes the Al3Sc type of the new phase exhibit excellent performance. These alloys cannot be replaced by other materials due to their special characteristics. Therefore, from the perspective of development, it is expected to become a major material in the future.
Application in new electric light source materials
After conversing pure Sc2O3 to ScI3, a new third-generation electric light source material can be made along with NaI. It can then be processed into a scandium -sodium halogen lamp for illumination. Under the action of high-voltage electricity, the spectral lines of scandium is blue and the spectral lines of sodium is yellow. The two colors cooperate to produce light similar with sunlight. The light has the advantages of high luminosity, good light color and energy saving, long life and strong fog breaking power.
Application in laser materials
Adding Sc2O3 (purity ≥ 99.9%) into gadolinium gallium garnet (GGG) can made gadolinium gallium scandium garnet (GGSG), which is composed of Gd3Sc2Ga3O12 type. The third-generation laser made by it has a transmission power that is 3.0 times higher than that of the same-volume laser, and has reached the standard of high-powered and miniaturized laser devices. At the same time, the laser oscillation output power and the performance of the laser are improved. At present, the application of this kind of laser in military technology is increasingly widespread, and it gradually turned to the civilian industry. From the perspective of development, its potential for military and civilian use will be greater in the future.
Application in electronic materials
Pure Sc2O3 can be used as an oxidation cathode activator for a color TV tube cathode electron gun, which works well. A layer of one-millimeter thick Ba, Sr, Ca oxide layer is sprayed on the upper end of the cathode of the color tube, and a 0.1 mm thick Sc2O3 is dispersed thereon. In the oxide layer cathode, Mg, Sr reacts with Ba to promote the reduction of Ba, and the released electrons are more active, emitting large current electrons and causing the phosphor to emit light. The use of a Sc2O3 coated cathode increases the current density by 4 times, making the TV picture clearer and increasing the life of the cathode by a factor of three. The amount of Sc2O3 used for each 21-inch developing cathode was 0.1 mg. At present, this cathode has been used in some countries in the world. For example, it is used in Japan to increase market competitiveness and promote sales of TV sets.
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