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Alumina Ceramic Rings

All sizes of alumina ceramic ring can be customized with high mechanical strength resistance, excellent strength in high temperature and thermal stability. It is including alumina ceramic baffle ring, alumina ceramic thrust seal ring and so on.
They are made from 95%, 99% or 99.7% alumina. The alumina ceramic rings are anti-abrasive, anti-corrosive, so they are often used in circulating pumps, fountain pumps, as well as other kinds of pumps.

Product Features:

1) High hardness, high strength, high wear and chemical corrosion resistance, low expansion coefficient
2) Good wear-resistant
3) High corrosion-resistant
4) Long Time warranty
Various sizes available, and we can customize as your requirement

Product Parameters:

Alumina ceramic ring
Max. diameter 3mm-400mm Height 1mm-40mm
Precision process CNC machining,grinding, lapping Min. tolerance +/-0.01mm
Roundness 0.05mm Flatness 0.02mm
Surface roughness Ra 0.2-0.6μm Liner straightness 0.01mm
Surface finish Glazed, polishing or metallized
Visual quality
1. No cracks,  no dark dots, no contamination and sharp edges
2. Evenly distributed glaze with very smooth surface
Property Units  
Al2O3 Content % 96 98 99.5 99.7
Density g / cm3 3.70 3.80 3.90 3.92
Color White White Ivory Ivory
Compressive Strength @ 25 C Mpa 2229 2091 2512 2350
Tensile Strength @ 25 C MPa 200 200 248 252
Flexural Strength @ 25 C MPa 331 276 324 320
Elastic Modulus @ 25 C GPa 290 331 366 380
Hardness : Knoop Rockwell (Gpa) Kg/mm2
R45N
(11.7)   1196
79
(12.5)   1276
77
(14)   1428
85
(15) 1510 90
Thermal Conductivity @ 25 C W / m-Deg K 20.8 28.1  

30.7

31.6
Coefficient of Thermal Expansion @ 25-1000 C 1 X 10-6 /
Deg C
7.9 8.5 8.1 8.0
Specific Heat @ 25 C cal / g / Deg C .184 .184 .182 .180
Maximum Working Temp. Deg C 1650 1650 1700 1700
VolumeResitivity       @25C   @700 C ohm-cm
ohm-cm
1 X 10-13
1 X 10-8
1X 10-13
2.2 X 10-9
1 X 10-13
6 x 10-7
1 X 10-13
6 x 10-7
Dielectric Strength
(@Thickness)   100Mils
ac volts
per mil
350 340 335 330
Dielectric Constant   1Mhz
@25C
e’ / eo 8.6 9.4 9.7 10.0
Dissipation Factor 1 Mhz
@25C
Tan Delta .0004  

.0003

 

.0003

.0002

Application and After-Sales Service:

We offer full range of ceramic washer, spacer, seal ring and other parts for industry applications like bushing, pump seal ring, shaft ring, etc.

Our alumina ceramic rings/loops are exported to USA, Canada, Europe, and South America and Southeast Asia.

After-sales service:

Accept any repair of the product, help to improve technology for customer. And also provide long-term technical help and support for you.

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