sapphire crystalIt is a widely used material with high temperature resistance, good thermal conductivity, high hardness, transparency to infrared radiation, and good chemical stability, widely used in the industrial field. At the same time, it is also a widely used single crystal substrate material, which is currently the substrate choice for blue, purple, white light emitting diodes (LEDs) and blue laser (LD) industries, and is also an important superconducting thin film substrate.
1、 Characteristic description
1. Chemical properties: Stable in nature, generally insoluble in water, not corroded by acids or bases, and can only be corroded by phosphoric acid and molten potassium hydroxide at high temperatures (300 ℃).
2. Physical properties: The Mohs hardness is level 9, with good transparency, thermal conductivity, and electrical insulation, as well as wear resistance and wind erosion resistance. The melting point is 2050 ℃, the boiling point is 3500 ℃, and the working temperature can reach 1900 ℃.
2、 Application
Sapphire glass is widely used in many fields such as science and technology, national defense and civil industry, electronic technology, etc.
3、 Production process
Preparation of raw materials → Filling of raw materials and installation of seed crystals → Vacuum pumping of the furnace body → Heating of the furnace body (with molybdenum and tungsten insulation covers) → Melting of raw materials → Welding of seed crystals → Growth of crystal necks → Crystal growth → Separation of crystals from crucibles (most of which are high-temperature resistant) → Cooling → Removal of crystals.
Sapphire glass generally refers to synthetic sapphire, which, like tungsten titanium alloy and high-tech ceramics, is a wear-resistant material. Due to its high strength, high temperature resistance, wear resistance and other characteristics, sapphire can be processed in a series of ways to exert its unique value. Therefore, it is often used to replace other optical materials in the production of optical components and infrared optical windows.
