High-Purity 99% Alumina Ceramic Rods

Typical Specifications

TecCera supplies precision ceramic rods manufactured from high-purity alumina containing at least 99% Al₂O₃. These rods combine high hardness, electrical insulation, wear resistance, dimensional stability, and resistance to elevated temperatures.

They are suitable for use as insulating supports, wear-resistant shafts, plungers, guide components, positioning pins, and other precision parts used in electrical, mechanical, thermal-processing, and chemical equipment.

Standard and custom sizes are available. Components can be manufactured according to customer drawings or samples, with optional precision grinding, polishing, drilling, slotting, and chamfering.

Key Features

• High hardness and excellent resistance to abrasive wear
• Good mechanical strength and dimensional stability
• Excellent electrical insulation and high volume resistivity
• Stable performance at elevated temperatures
• Resistant to oxidation and many commonly used chemicals
• Smooth, precision-ground or polished surfaces available
• Non-magnetic and electrically insulating
• Custom diameters, lengths, profiles, and tolerances

Typical Specifications

Product Advantages

High Wear Resistance

The high hardness of alumina provides excellent resistance to abrasion and surface wear. Precision-ground or polished rods can be used in sliding, guiding, positioning, and sealing applications where long-term dimensional stability is required.

Electrical Insulation

High-purity alumina provides excellent electrical insulation, high dielectric strength, and low dielectric loss. It is suitable for insulating supports, feedthrough components, electrode supports, and high-voltage equipment.

Elevated-Temperature Stability

Alumina retains useful mechanical and electrical properties at elevated temperatures and offers relatively low thermal expansion. Actual operating-temperature limits depend on the applied load, atmosphere, component geometry, and heating or cooling rate.

Chemical and Oxidation Resistance

Alumina is resistant to oxidation and many industrial chemicals. Compatibility should nevertheless be evaluated for concentrated acids, strong alkalis, molten salts, and high-temperature corrosive media.

Precision Customization

Ceramic rods can be manufactured to customer drawings with controlled diameter, length, straightness, surface roughness, and dimensional tolerances. Secondary machining is available for more complex features.

Typical Applications

Electrical and Electronic Equipment

• Electrical insulating rods and supports
• Electrode and heater supports
• High-voltage insulation components
• Semiconductor-equipment fixtures and insulating components

High-Temperature Equipment

• Heating-element supports
• Furnace positioning and support components
• High-temperature electrical insulation
• Kiln and thermal-processing equipment components

Mechanical Engineering

• Wear-resistant shafts and plungers
• Guide rods and positioning pins
• Sliding and bearing components
• Precision measuring and locating components

Chemical and Laboratory Equipment

• Corrosion-resistant support components
• Laboratory instrument components
• Fluid-handling and analytical equipment parts

Alumina Rods vs. Zirconia Rods

Alumina is usually preferred for electrical insulation, high-temperature stability, hardness, and cost-sensitive wear applications. Zirconia is more suitable when fracture toughness and resistance to mechanical impact are the primary requirements.

Frequently Asked Questions

What is the maximum service temperature of a 99% alumina ceramic rod?

The allowable service temperature depends on the alumina grade, applied load, atmosphere, rod dimensions, and heating and cooling rates. Please provide your operating temperature and conditions so that the appropriate material grade can be evaluated.

Can alumina ceramic rods be custom machined?

Yes. We support custom diameters, lengths, profiles, surface finishes, and tolerances. Available machining operations include precision grinding, cutting, drilling, slotting, chamfering, lapping, and polishing.

For long or slender rods, achievable straightness and dimensional tolerances must be evaluated according to the diameter-to-length ratio.

Can holes be added to an alumina ceramic rod?

Yes, depending on the dimensions and required geometry. However, a component with a continuous axial hole is normally classified as an alumina ceramic tube rather than a solid ceramic rod. Please provide a drawing for manufacturability review.

Is alumina suitable for rapid temperature changes?

Alumina provides good high-temperature stability but has limited resistance to severe thermal shock compared with some specialized ceramic materials. Rapid heating and cooling should be avoided unless the component has been specifically designed and tested for thermal cycling.

What information is required for a quotation?

Please provide the following:

• Technical drawing or reference sample
• Alumina purity requirement
• Diameter, length, and tolerances
• Straightness and surface-roughness requirements
• Operating temperature and atmosphere
• Mechanical load and chemical exposure
• Required quantity

Send us your drawing or application requirements for material evaluation, manufacturability review, and quotation.