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Alumina Ruby Bearing

Alumina Ruby Bearing

Product Details

Place of Origin: Chongqing, China

Payment & Shipping Terms

Minimum Order Quantity: 100pcs

Price: 1USD-50USD

Packaging Details: Caron, Air bubble films

Delivery Time: 4-8weeks

Payment Terms: T/T, Western Union

Supply Ability: 10000PCS per month

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Specifications
Highlight:

alumina Ruby Bearing

,

Hexagonal crystal Ruby Bearing

,

alumina micro ball bearings

Material:
Sapphire
Growing Method:
CZ
Use:
Jewlery, Watch Case, Watch Glass
OEM:
Yes
Delivery Port:
Chongqing
Delivery Time:
According To Quantity
Color:
Ruby
Size:
Customized Size
Material:
Sapphire
Growing Method:
CZ
Use:
Jewlery, Watch Case, Watch Glass
OEM:
Yes
Delivery Port:
Chongqing
Delivery Time:
According To Quantity
Color:
Ruby
Size:
Customized Size
Description
Alumina Ruby Bearing

Convex Head Synthetic Bearing For Instrumentation Components

 

 

Sapphire, which is derived from the Latin Spphins, which means blue; it belongs to the corundum group of minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires.

 

The main component of sapphire is alumina (Al2O3). Corundum contains trace elements such as iron (Fe) and titanium (Ti), and presents colors such as blue, sky blue, and light blue, among which the bright sky blue is the best.

 

Sapphire precision parts are generally used in the wear-resistant and high-temperature parts of instruments, meters, and equipment.

 

Sapphire has a hardness of 9 on the Mohs level, second only to diamond, and has good wear resistance. At the same time, it has excellent chemical stability and can resist almost any acid and alkali corrosion. In addition, the maximum temperature of sapphire reaches 2060℃. It is precisely because of the above advantages of sapphire that sapphire is used in instrumentation equipment, which can significantly increase the service life and withstand various harsh environments.

 

Gem bearings are sliding bearings made of hard materials such as gemstones. A natural or synthetic gem (usually a sapphire) that, after careful grinding, is carefully ground out in a conical hole and can be used as a bearing for the head-turning shaft or for other precision instruments.

 

Gem bearings are mainly used in instrumentation. Instrument bearings bear a small load, but to rotate high accuracy, good sensitivity, long service life. Gemstones have small friction, high hardness, corrosion resistance, low coefficient of thermal expansion, high performance of pressure strength, to meet the requirements of the use of instrument bearings. The materials for making gem shafts include corundum, agate, microcrystalline glass, etc. Corundum is the body of alumina, natural and man-made. Natural corundum impurities are more, uneven texture, so artificial corundum is the most widely used.

 

The working surface is a gem bearing with an inner concave sphere, or a small inner concave sphere (i.e. a double spherical surface) with a small radius at the center of the inner concave sphere.

 

 

General Chemical Formula Al2O3
Cystal System Hexagonal system
Melting Temperature 2040℃
Thermal Thermal Expansion Parallel to C-axis:6.7*10-6
Perpendicular to C-axis:5.0*10-6
Specific Heat 0.18 Cal/gm°K(25℃)
Mechanical Density 3.98-4.1g/cm3
Hardness 9 Moh's Scale
(Hv)≥1700kg/mm2
Modulus of Elasticity 340-380Gpa
Compressive Strength 2.1Gpa
Tensile Strength 0.19Gpa
Optical Index of Refraction Parallel to C-axis:1.769
Perpendicular to C-axis:1.769
Index of IR Transmission 85%
Electrical Electrical Resistance >1016Ω/cm(25℃)
Dielectric Constant 7.5-10
Chemical Erosion Resistance Can not be corroded by adid or alkali at mormal temperature, only can be corroded by HF at 300℃

 

Alumina Ruby Bearing 0

 

Why US?

 

1. We’re the rare source manufacturer of color sapphire boule, and the most professional factory of sapphire processing, especially the special watch case.

2. We have our own sapphire grown equipent with CZ and KY method.

3. Professional customized production according to the drawing provided by clients.

4. Precision work of sapphire processing and polishing.

5. Experienced technicians and skilled workers.

 

FQA

1. Are you a trading company or factory?

We are a professional factory of sapphire products, also a trading company .

 

2.Can you do customized products?

Yes, we specialized in customized production or OEM work.

CAD,3D drawing are needed.

 

3.Could you provide samples?

Yes, we could provide samples with a charge, but if you place the order with a quality above 100pcs, the sample charge will be refunded.

 

4.What’s the delivery time?

It depends on the type of products and the quality.

For watch case, the regular time is around 5-8 weeks for 200pcs according to the difficulty of the processing.

 

5.How about the payment?

T/T payment is prefered.

 

6.How about the delivery?

Mostly by air, like DHL, Fedex.

 

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