The Kyropoulos process (KY process) for sapphire crystal growth is currently used by many companies in China to produce sapphire for the electronics and optics industries.
High-purity, aluminum oxide is melted in a crucible at over 2100 degrees Celsius. Typically the crucible is made of tungsten or molybdenum. A precisely oriented seed crystal is dipped into the molten alumina. The seed crystal is slowly pulled upwards and may be rotated simultaneously. By precisely controlling the temperature gradients, rate of pulling and rate of temperature decrease, it is possible to produce a large, single-crystal, roughly cylindrical ingot from the melt.
After single crystal sapphire boules are grown, they are core-drilled into cylindrical rods, The rods are sliced up into the desired window thickness and finally polished to the desired surface finish.
Use as substrate for semiconducting circuits
Thin sapphire wafers were the first successful use of an insulating substrate upon which to deposit silicon to make the integrated circuits known as silicon on sapphire or "SOS", Besides its excellent electrical insulating properties, sapphire has high thermal conductivity. CMOS chips on sapphire are especially useful for high-power radio-frequency (RF) applications such as those found in cellular telephones, public-safety band radios, and satellite communication systems.
Wafers of single-crystal sapphire are also used in the semiconductor industry as substrates for the growth of devices based on gallium nitride (GaN). The use of sapphire significantly reduces the cost, because it has about one-seventh the cost of germanium. Gallium nitride on sapphire is commonly used in blue light-emitting diodes (LEDs).
Used as a window material
Synthetic sapphire (sometimes referred to as sapphire glass) is commonly used as a window material, because it is both highly transparent to wavelengths of light between 150 nm (UV) and 5500 nm (IR) (the visible spectrum extends about 380 nm to 750 nm, and extraordinarily scratch-resistant. The key benefits of sapphire windows are:
* Very wide optical transmission band from UV to near-infrared
* Significantly stronger than other optical materials or glass windows
* Highly resistant to scratching and abrasion (9 on the Mohs scale of mineral hardness scale, the 3rd hardest natural substance next to moissanite and diamonds)
* Extremely high melting temperature (2030 °C)
Properties of sapphire
|Max. use temperature||1800-1900oC|
|Tensile strength||250-400 MPa|
|Compressive strength||2000 MPa|
|Young's Modulus||350-400 GPa|
|Bending strength||450-860 MPa|
|Rapture Modulus||350-690 MPa|
|Linear expansion rate (at 293-323 K)||5.0*10-6K-1(⊥ C)|
|Thermal conductivity (at 298 K)||30.3 W/(m*K)(⊥ C)|
|32.5 W/(m*K)(∥ C)|
|Specific heat (at 298 K)||0.10 cal*g-1|
|Resistivity (at 298 K)||5.0*1018 Ω*cm(⊥ C)|
|1.3-2.9*1019 Ω*cm(∥ C)|
|Dielectric constant (at 298 K, in 103-109 Hz interval)||9.3 (⊥ C)|
|11.5 (∥ C)|
As a prominent manufacturer and exporter who focus on watches and watchparts R&D, manufacturing and sales, we welcome OEM/ODM orders. Our main products including Watches, Watch Parts such as: case, face, glass, straps, bezel inserts, hands, etc., which are all manufactured by high grade raw material and designed in compliance with high quality standard.
We regard "High-quality, Reasonable prices and satisfactory after-sales" as our tenet, offer clients with not-only top notch products but also best after-sale services. All our products are acclaimed for its durability, stylish look and high performance in this domain. Warmly welcome potential buyers to contact us, and looking forward to establishing long term mutually beneficial relationship with you!.
Our Related Sapphire Products
Q1: How can I get the price and consult for product details?
A1: Send enquiry via Email, Skype, Wechat or Call us directly.
Q2: What is your main product? OEM/ODM ?
A2:Thermal interface material, Sapphire Glass products, Die cut service for industrial etc.
&OEM/ODM is available. For details, please kindly contact the sales persons.
Q3: How is your quality of products and quality guarantee policy?
A3: 100% full test before shipping and 100% compliance with the request of clients.
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A3: Usually in 10-30days after 100％ T/T, Western Union, L/C, Paypal,Etc.