Property of Sapphire/Ruby
Composition | Al2O3 |
---|---|
Structure | Hexagonal crystal |
Mechanical property | Tensile strength: 0.5GPa Bending strength: 0.5 to 0.7GPa Compressive strength: 3.0 to 3.4GPa Young’s modulus: 350 to 470GPa Hardness: HK1,500 to 2,000 * Values for reference |
Feature |
|
Sapphire/ruby in the rough
Crystal structure of sapphire
Example of processing shape of sapphire/ruby
As Sapphire/ruby is a hard and bristle material, it is extremely difficult to process. To the contrary, it is able to shape a smooth and sharp edge, which is characteristic of single crystal materials.
Sapphire has such an excellent optical property as it becomes colorless and transparent when having polished, and is used as a material of observation and a sensor window.
Ruby has almost same physical property as sapphire, but it becomes red by getting mixed with chromium oxide. When you need to confirm visibility while using, ruby is more suitable than sapphire.
Processing sapphire/ruby
Sapphire
- Ra0.0169
Polishing inner surface: Roughness of surface Ra0.0169.
Ruby
- In the center of concave R of cup shape, micro hole is processed.