Xiamen Unipretec Ceramic Technology Co., Ltd.

China Manufacturer with main products: Alumina Ceramic, Zirconia Ceramic, Silicon Nitride, Boron Nitride, Ceramic Grinding Media, Ceramic Cutting Blade, Ceramic Dosing Pump,...

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Alumina Ceramic Sleeves

FOB Price: 1.00 - 2.00 USD/Piece
Supply Ability: 10,000 Piece/Pieces per Month
Shipping: 30 days, Xiamen Port
Payment Terms: L/C, T/T, Western Union
In Stock
Export Markets: North America, South America, Eastern Europe, Southeast Asia, Mid East, Eastern Asia, Western Europe
Place of Origin: Fujian in China
Packaging Details: wooden case

Quick Details

  • Brand Name: UNIPRETEC
  • Model Number: N/A
  • Density: 3.65-3.90 g/cm3
  • Color: white, ivory
  • Alumina Content: 95%, 99%
  • Water Absorption: 0%
  • Moh's Hardness: 9
  • Compressive Strength: 2000 - 2500 Mpa
  • Flexural Strengh: 280 - 350 Mpa


Alumina is the most popular ceramic material resulting from nearly endless availability in different purities, starting with approx. 92 % ending up with 99.99 % qualities and the specific material characteristics. Combining a medium level bending strength with excellent wear resistance, high hardness and relatively good thermal conductivity Alumina is versatile useable. Especially in electrical applications and high temperature operations the excellent insulating behavior and dielectric strength favor Alumina for use up to 1750 °C.

Hardness is paired with high brittleness, therefore Alumina is not suited in highly loaded machinery applications. From time to time a customizing and modification in design-engineering can succeed.

Characteristics of Alumina include:

* Electrically insulating
* High thermal conductivity
* High strength and stiffness

* Available in a range of purities

* Excellent resistance to strong acids and alkalis at elevated temperatures

Key Features of Some Advanced Technical Ceramics

Characteristics Unit 95 Al2O3 99 Al2O3  ZrO2 SSiC SiSiC B4C HPS3N4
Color white ivory white black black black dark gray
Density g/cm3 3.65 3.88 6.05 3.12 3.06 2.51  3.25
Young's Modulus Gpa 280 350 205 400 320 420 310
Vickers Hardness Gpa 14 20 12 25 22 36 22
Flexural Strength Mpa 280 300 900 400 300 370 850
Compressive Strength Mpa 1700 2000 2500 2200 2000 2900 2800
Thermal Conductivity W/(m?K) 25 30 2.2 100 130 35-40 27
Thermal shock resistance ΔT(C°) 220 180-200 400 350 220 130 450-650
Max. Working Temperature 1500 1700 850 1500 1300 1500 1200
Volume Resistivity ( 20  ) Ω?cm >10^15 >10^14 >10^12 >10^6 >10^6



Applications of Alumina Ceramics

Plasma torch insulator
A stainless steel fabrication company needed a custom-made plasma torch, which called for a custom-made insulator with provision for cooling air flow. It had to be a precision fit in the housing, Here is the result of extrusion followed by grinding.

High Pressure Seal
This is a ceramic seal for a high pressure pump. The smaller component fits into the bevel in the larger ring, with the mating faces polished to a 50 nanometre Ra (N2) finish.

How to create a turbulent flow
Combustion is more efficient when the gases are pre-mixed. A designer of a very large burner had the problem of mixing the gases in a short path length relative to the diameter. We collaborated on the design and came up with a three-dimensional grid of tubes. The assembly is 820 mm long and 350 mm high.

Optical connector substrate
Tiny precision optical components can only retain their alignment if mounted on a stiff platform. In this case, meatl was not stiff enough and the thermal expansion would be too great. The solution was Macor , exploiting its excellent machinability. Note the precisely located 2.0 mm diameter through holes, and the 1.0 mm thick web in the bottom of the deepest pocket. We CNC machined this with conventional tooling.

Heat Shield
A research laboratory in a multinational metals company needed a structural support for some instrumentation. The support needed to carry the weight of the instruments while shielding them from radiant heat. The solution: a precision machined disc, 170 mm in diameter with view ports.

Corrosion Resistant Liner
These liners are used in a plasma arc furnace operating at 1600 deg. Centigrade. The liners provide protection against hydrogen chloride vapour, far outlasting any metal that was tried. The outside diameter, the length and the step are machined to a precise fit in a metal sleeve.

High Power Insulators
These insulators are used in a high power, high voltage, radio frequency generator. The outside diameter is precision ground. Note the delicate thickness: 3 mm! Alumina was chosen for its excellent electrical properties under extreme conditions.

Hot Ball Mill
Our client needed to react mineral samples at a temperature of 1000 deg C, with continuous aeration and tumbling. We made a ball mill shell with a capacity of 4 litres. It withstands continuous rolling with a load of 3 kg of minerals. This is an application of our special creep-resistant alumina.

Wire Guides
High purity alumina is well known as an outstandingly hard and abrasion resistant material. So, when one of Australia's largest manufacturers of wire cable came to us for a set of alumina wire guides, we were not surprised. We were surprised when they said they needed 160 guides of a completely new design custom-made in two days! Thanks to our skilled staff and excellent diamond machining, the order was shipped in 28 hours.

Frictionless clutches
A company came to us looking for a material that could be used for clutch plates. The clutch could be stationary for days between uses, so any lubricating oil would drain away. The clutch would then burn out on start-up. We suggested highly polished alumina, which can run dry with no detectable wear after very heavy sliding loads. The coefficient of friction was as low as 0.03, so there was almost no change in friction when the oil finally arrived. The clutch was a complete success - but it did require enormous springs to get the normal force high enough to transmit the torque.

Controlled Bluntness
The tips of the multiple blades of a highly specialised cutting shear had to be just fine enough to follow a soft, irregular surface, but blunt enough to be sure that they would not cut or puncture it. We came up with a precision extruded section having two concave grooves along it with controlled root radii of 0.18 and 0.16 mm. The outstanding abrasion resistance of alumina allows a perfectly formed bead to be formed on hundreds of tips.

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