Alumina Ceramic

Alumina(Al₂O₃) Ceramic

Alumina or Aluminum Oxide, a nonporous ceramic, is widely used in many applications due to its excellent performance in harsh environments and outstanding price/performance ratio. Aluminum oxide ceramic is electrically and mechanically strong.

strongly acid and alkali corrosion resistant
high hardness, wear and abrasion resistant
high dielectric strength, electrical insulated
max. service temperature up to 1,800 degree C

Alumina Ceramic Introduction

According to purity difference, alumina is sorted into various grades. Unipretec provides high purity alumina materials including 95% alumina, 96% alumina, 99% alumina, 99.5% alumina, 99.8% alumina. A grade is chosen for different using environment to ensure the alumina components meet the specific using requirement and cost-effective at the same time.

95% alumina ceramic (A950) - this purity grade Alumina(Aluminum Oxide) provides excellent mechanical strength as well as electrical insulation. Due to the outstanding mechanical strength, it’s suitable for applications like plunger for pump, shaft and pin, cylinder liners, etc. Meanwhile its superior electrical-insulated properties at high temperature makes it performs great for electrical components, such as electrical insulator, high voltage insulator, insulated washers. 95% al2o3 ceramic can withstand temperature as high as 1500 °C, so it’s applied for high temperature components like thermocouple tubes.

96% alumina ceramic (A960) - it’s generally used for producing ceramic substrate. The alumina ceramic substrate offers electrical stability and strong flexural strength at high temperature. With the properties of electrical insulated, good thermal conductivity, low coefficient of thermal expansion (CTE) and good price, alumina substrate becomes one of the most durable and economical insulated substrate materials. Al2O3 substrate is also widely used in thin-film and thick-film electronics applications. It makes a reliable PCB substrate material that allows the designer to achieve higher power density designs.

99% alumina ceramic (A990) - higher purity alumina indicates enhanced wear, corrosion and temperature resistance. 99% alumina material can maintain good strength and stiffness under temperature as high as 1,650 °C. Therefore it’s an excellent material for sintering furnace plate used for MIM (Metal Injection Moulding) parts sintering. The 99% purity al2o3 ceramic can be machined or net shape formed into complex components. And it can be finely grind and lapped into very smooth surface. Typical applications such as piston for pressure washer pump, metering pump, seal rings, etc.

99.8% alumina ceramic (A998) - it’s high purity alumina material with free silica as well as low sodium purity level, so it’s able to be polished and achieve superior surface finish (min. Ra 0.05μm), better than that of 99% alumina. It’s a good choice when super smooth surface is needed. This material also perform strong inertness and extreme hardness. Used in extreme conditions demanding outstanding strength, high operating temperatures, and ultra-pure composition.

Alumina Ceramic

Alumina Rod

Alumina Ceramic Applications

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Unipretec manufactures alumina rod with aluminium oxide purity of 95%, 99%, and 99.8%. Due to their remarkable characteristics, such as their high-temperature resistance, mechanical strength, electrical insulation, and chemical inertness, alumina rods are an essential component in a variety of applications. Our alumina rods are used in a wide range of industries, including electrical and electronic components, medical devices, and aerospace applications.

Zirconia Ceramic

FAQ'S

For more complex items, we should be able to respond within 24 or 48 hours. If you have any other specific question on any of our products or services, please contact us by email [email protected] or by telephone +86 592 5510319.

Q1: How strong is alumina ceramic?

>>> The hardness of alumina ceramics is nearly three times that of stainless steel. Alumina is a 9 on the Mohs scale. It cannot be scratched by anything with a lower hardness, so alumina can only be damaged by very few materials, including diamond. Compressive strength: This is the strength of alumina, which can reach 3,000 Mpa, a value that can exceed that of Zirconia.

Q2: Is alumina acid resistant?

>>> Alumina ceramics are widely used because of chemical corrosion resistance. Shifting atoms structure changes just enough to become chemically inert and thus unable to react rapidly with additional water molecules or atmospheric oxygen. This change in molecular structure is why aluminum oxide metal resists corrosion. Although alumina ceramics can resist many strong acids and organic acids, it can be corroded by HF due to silicon components in raw materials.

Q3: Is alumina an insulator or conductor?

>>> Alumina is commonly used as electrical insulator, particularly the higher purity grades which offer better resistivity.

Q4: How do you clean ceramic alumina?

>>> This is done by immersing the ceramic in a heated solvent (heating to increase activity) and then placing them inside an ultrasonic cleaner for at least 15 minutes. The solvent is then rinsed off using deionized or distilled water, which removes any loose contaminants from the surface.

Q5: How is alumina ceramic manufactured?

>>> Alumina components can be formed by a variety of manufacturing techniques such as dry pressing, cold isostatic pressing, injection molding, tape casting, and extrusion. Finishing can be accomplished by precision grinding and lapping, laser machining and a variety of other processes.

Q6: How long will it take for you to send me a quote?

>>> This depends totally on the complexity of your requirements. For simple items such as bars and rods, we can generally supply a quotation within 24 hours.

Q7: What is the disadvantage of alumina?

>>> Alumina shares several characteristics with other polycrystalline ceramic materials, such as moderate tensile and bending resistance and the brittle fracture behavior, which is the main disadvantage of the mechanical properties of alumina.