High-Strength, High-Hardness Alumina Ceramic: A Key Industrial Material With Superior Performance

High-Strength, High-Hardness Alumina Ceramic: A Key Industrial Material With Superior Performance

Product Introduction

Alumina ceramic (Al₂O₃) is an advanced ceramic material with alpha-alumina as the main crystal phase. It is renowned for its unique high strength, high hardness, exceptional wear resistance, excellent high-temperature performance, and stable chemical properties. Through strict raw material formulation and advanced manufacturing processes, our alumina ceramic components are characterized by dense structure, reliable performance, and long service life, making them an ideal choice for extreme and harsh working conditions.

Main Applications

This material is widely used in critical components across various industrial fields:

• Wear-Resistant Applications: Ceramic linings, wear-resistant bricks, grinding media (balls), nozzles, cutting tools, shaft sleeves, etc.

• High-Temperature Applications: Kiln rollers, refractory supports, thermocouple protection tubes, crucibles, electronic substrates, etc.

• Insulation Applications: High-voltage insulators, circuit substrates, vacuum tube enclosures, spark plugs, etc.

• Chemical Industry Applications: Seals for chemical pumps, valves, bearings, and other corrosion-resistant parts.

• Medical and Aerospace: Artificial joints, special instrument components, etc.

Core Advantages

• Extreme Hardness: High Vickers hardness, second only to diamond and silicon carbide, with wear life far exceeding that of metal materials.

• Excellent Wear Resistance: Low friction coefficient, wear resistance is 266 times that of manganese steel and 171.5 times that of high-chromium cast iron.

• High Strength: High compressive and flexural strength, capable of withstanding heavy loads and high stress.

• High-Temperature Resistance: Can be used for long periods in environments above 1600°C without melting or deforming.

• Excellent Chemical Stability: Resistant to acid and alkali corrosion, and does not react with most metal solutions or molten glass.

• Good Electrical Insulation: High resistivity, making it an excellent insulating material.

Specification Parameter Table

Note: The above parameters can be adjusted based on material purity and process, and customization is supported.

Process Flow

High-purity raw material selection → Precise formulation and ball milling → Spray granulation → Dry pressing/isostatic pressing → Precision machining (green body) → High-temperature sintering (above 1600°C) → Precision grinding and polishing → Non-destructive testing → Packaging and shipping.

Usage Instructions

1. Design Phase: Fully consider its brittleness; avoid sharp corners and recommend using transition fillets. Pay attention to installation tolerance.

2. During Installation: Do not strike directly with a metal hammer. Use a rubber hammer or add padding (wood/copper plate) for even force application.

3. During Use: Avoid localized overheating or rapid temperature changes (thermal shock) to prevent thermal stress cracks.

4. Maintenance: Regularly inspect equipment operation status. Check ceramic components for abnormal cracks or chips and replace them promptly.

After-Sales Service

We provide professional technical consultation, application solution design, and comprehensive after-sales support. Products with quality issues can be returned or replaced, and lifelong technical consultation services are offered.

FAQ

• Q1: What is the difference between alumina ceramic and zirconia ceramic?

  • A: Alumina ceramic has higher hardness, better wear resistance, higher temperature resistance, and lower cost. Zirconia ceramic has better strength and toughness (impact resistance) but is more expensive and has slightly inferior long-term high-temperature performance. The choice depends on the specific application.

• Q2: Can it be machined to very high dimensional accuracy?

  • A: Yes. Sintered alumina ceramic can be precision machined with diamond grinding machines to achieve micron-level accuracy, meeting various precision assembly requirements.

• Q3: What is its biggest disadvantage?

  • A: Its main disadvantage is its brittleness and poor resistance to mechanical impact. It is not resistant to impact or bending stress, so stress concentration must be avoided during design and use.