High-Temperature And Corrosion-Resistant Alumina Ceramic The Best Solution For

Product Specification

High-Temperature And Corrosion-Resistant Alumina Ceramic The Best Solution For Extreme Conditions

Introduction
Alumina ceramic gaskets and insulating sheets are specialized ceramic components made from high-purity alumina (Al₂O₃) through precision molding and ultra-high temperature sintering processes. They not only possess the high hardness and wear resistance of structural ceramics but are also indispensable basic components in high-end industrial fields due to their excellent electrical insulation, outstanding thermal stability, extremely low dielectric loss, and superior corrosion resistance. They provide critical protection for the safe, stable, and long-term operation of equipment in complex environments.

Applications
These products are widely used in applications requiring electrical insulation, physical isolation, high-temperature sealing, or high-frequency signal transmission:

• Electronics & Semiconductors: Insulating substrates and gaskets for power semiconductor modules (IGBT), packages, vacuum feedthrough insulators.

• New Energy: Insulating and sealing sheets between fuel cell stacks, insulation isolation for power battery modules.

• High-Voltage Electrical Equipment: Insulating pillars, shielding covers, and insulating bushings for high-voltage switches and vacuum circuit breakers.

• High-Temperature Equipment: Thermal insulation linings for induction heating furnaces and industrial microwave ovens, insulating tubes for thermocouples.

• Laser Systems: Insulating supports and vacuum seals for RF electrodes in CO2 laser tubes.

Advantages

1. High Insulation Strength: High volume resistivity and dielectric strength, effectively blocking high-voltage currents to ensure equipment and personnel safety.

2. Excellent Thermal Conductivity: Provides electrical insulation while efficiently conducting heat, facilitating heat dissipation for power components (e.g., as insulating thermal pads).

3. Extremely Low Dielectric Loss: Stable dielectric performance in high-frequency and high-voltage environments, with low signal transmission loss, suitable for high-frequency communication equipment.

4. High Temperature and Thermal Shock Resistance: Low coefficient of thermal expansion, withstands severe thermal cycling without cracking, operating temperatures up to 1600°C.

5. Corrosion and Aging Resistance: Resistant to acids, alkalis, solvents, and harsh atmospheric conditions, with long-term stable performance and lifespan far exceeding organic insulating materials like plastics and mica.

Specifications Table

Manufacturing Process
High-purity alumina powder → Binder addition and mixing → Tape casting/Dry pressing → Blanking/CNC green machining → High-temperature sintering → Precision grinding (double-sided parallelism) → Laser cutting/Ultrasonic cleaning → Full dimensional and performance inspection → Packaging.

Usage Instructions

1. Pre-Installation: Keep the mounting surface and ceramic sheet clean, dry, and free of oil stains. Check the edges of the ceramic sheet for chipping or microcracks.

2. During Installation: Apply clamping force evenly, avoid point loads or impact forces to prevent brittle fracture. Use a torque wrench is recommended.

3. System Design: When designing mounting grooves or fixtures, account for the difference in thermal expansion coefficients between ceramic and metal, and leave appropriate expansion gaps.

4. Maintenance: Regularly check if fasteners are loose. Be careful during disassembly to avoid fragments falling into the equipment.

After-Sales Service
We provide professional technical consultation and selection guidance. The product warranty period is 12 months. Customization based on drawings or samples is supported, with detailed technical drawings provided for confirmation. Test reports on the performance parameters of delivered products are available.

FAQ
Q1: What is the difference between alumina ceramic sheets and aluminum nitride (AlN) ceramic sheets?
A1: The main difference lies in thermal conductivity. Aluminum nitride (AlN) has a much higher thermal conductivity (approx. 180 W/m·K) than alumina, but it is also several times more expensive. Alumina offers the best cost-performance ratio for meeting the vast majority of insulation and general thermal conductivity requirements.

Q2: Can holes be drilled in ceramic sheets or can they be made into complex shapes? What is the precision?
A2: Yes. Through laser precision machining, various complex shaped holes and profiles can be produced, with minimum hole diameters down to 0.2mm and dimensional accuracy up to ±0.01mm.

Q3: Can they replace traditional mica sheets or plastic insulating sheets?
A3: Absolutely, and with superior performance. Ceramic sheets outperform organic materials in temperature resistance, pressure resistance, lifespan, and reliability, especially suitable for applications with extremely high requirements for reliability and longevity.