Alumina Ceramic: Expert in High-Performance Insulation and Wear-Resistant Solutions

Introduction
Alumina Ceramic (Al₂O₃) is an advanced industrial ceramic material with alpha-alumina as its main crystal phase. Produced from high-purity raw materials through high-temperature sintering processes, it is renowned for its exceptional electrical insulation properties, extreme hardness, and outstanding wear resistance. In the electronics and precision machinery industries, it is a critical foundational material for achieving high reliability, long service life, and stable operation of equipment.

Uses/Applications
Its applications are broad, primarily falling into two categories:

• Insulating Supports in Electronic Devices: Used as circuit board insulating spacers, semiconductor equipment insulators, vacuum feedthroughs, high-voltage switch insulation housings, tube sockets, heat sink substrates (e.g., for LEDs), etc., providing insulation, support, heat dissipation, and protection.

• Wear-Resistant Parts in Precision Machinery: Used as bearings (especially high-speed bearings), bearing sleeves, mechanical seal rings, wear-resistant liners, yarn guides, measuring instrument rails, connectors, etc., offering excellent wear-resistant solutions under harsh conditions like high speed, high temperature, and non-lubrication.

Advantages

1. Excellent Electrical Insulation: High volume resistivity and high dielectric strength effectively prevent current leakage and breakdown, ensuring circuit safety.

2. Super High Hardness & Wear Resistance: Hardness is second only to diamond and silicon carbide. Far exceeds the service life of metal materials, significantly extending equipment maintenance cycles.

3. Superior Mechanical Properties: High compressive strength and high stiffness, capable of bearing heavy loads with minimal deformation, ensuring dimensional stability.

4. High-Temperature Resistance & Chemical Stability: Resistant to high temperatures, features a low coefficient of thermal expansion, and can resist corrosion from various acids, alkalis, and organic solvents, making it suitable for harsh environments.

5. Cost-Effective: Among high-performance ceramics, alumina ceramic has mature production processes and relatively controllable costs, making it the most widely used engineering ceramic.

Specifications Parameters Table (96% Al₂O₃ Typical Values)

Manufacturing Process
The core process flow includes: High-purity alumina powder preparation → Formulation and additive mixing → Spray drying → Dry pressing/Isostatic pressing → High-temperature sintering (>1600°C) → Precision CNC grinding/lapping/polishing → Rigorous full-performance testing (dimensions, appearance, properties) → Packaging & Dispatch.

Usage Instructions

1. Pre-Installation Check: Carefully inspect the ceramic part for any edge chipping, cracks, or other damage from transportation.

2. Careful Handling: Although very hard, it is brittle. Avoid impact, knocking, or applying improper localized stress.

3. Assembly Design: When mating with metal parts, the difference in the coefficient of thermal expansion (CTE) between ceramic and metal must be considered. Design with appropriate elastic buffering (e.g., using O-rings, soft gaskets) is recommended; avoid interference fits.

4. Cleaning & Maintenance: Can be cleaned ultrasonically (with neutral cleaner). Avoid scratching the surface with hard objects.

After-Sales Service
We provide a standard product warranty period (typically 12 months) and are committed to offering professional technical support, product selection consultation, and a rapid response process for handling quality issues.

FAQ

• Q: How does alumina ceramic compare to silicon nitride and zirconia ceramics?

  • A: Alumina offers balanced overall performance and the lowest cost; Silicon Nitride has the best fracture toughness and thermal shock resistance, making it more suitable for bearings; Zirconia has the highest toughness and strength, but its wear resistance is inferior to alumina and it is more expensive.

• Q: Can complex machining be performed?

  • A: Sintered alumina ceramic is extremely hard and can only be processed by grinding with diamond tools. Complex shapes are best formed directly by mold pressing before sintering to reduce subsequent machining costs.

• Q: Can it be made into composite parts with metals?

  • A: Yes. Through metallization treatment (e.g., molybdenum-manganese process), a metal layer can be formed on the ceramic surface, enabling brazing or sealing with metals to create hermetic composite components.