Product Name: 99% High-Purity Alumina Insulating Ceramic Sleeve
Product Material: 99% Alumina ($Al_2O_3$), Fine-grained dense ceramic.
Material Characteristics: Excellent electrical insulation (Dielectric strength $\ge$ 15-20 kV/mm), High service temperature (up to 1650°C continuous, 1750°C short-term), High mechanical strength and hardness, Low dielectric loss, Excellent chemical stability against acids and alkalis, Zero porosity for high-vacuum integrity.
Application Fields: High-voltage electrical feedthroughs, Furnace heating element supports, Thermocouple protection tubes, Corona discharge equipment, Vacuum interrupters, Laser system insulators, High-precision analytical instruments.
Application Industries: Biomedical (Sterilization equipment), Advanced Machinery (High-temperature kilns), New Energy (Solid oxide fuel cells), Fluid Control (Corrosive fluid sensors), Electronic Engineering (Power electronics insulation), Aerospace (Avionics thermal protection), Petrochemical (Downhole high-temp tools), Broad Semiconductor (Etching chamber insulators).
Processing Difficulties: Controlling strict geometric tolerances (ovality and concentricity) for precision assembly, Managing brittleness during thin-wall grinding to prevent micro-cracks, Achieving consistent wall thickness to ensure uniform electrical field distribution and prevent voltage breakdown.
Processing Flow: Powder preparation → Isostatic Pressing or Extrusion → Green body precision machining → High-temperature sintering (approx. 1700°C) → Precision diamond grinding (ID/OD) → Ultrasonic cleaning → 100% Insulation resistance testing → Final inspection → Vacuum/Safe packaging.
Delivery Period: Standard sizes: 10-20 days,
The 99% Alumina Insulating Sleeve is a high-performance component designed for the most demanding electrical and thermal environments. With significantly higher purity than standard ceramics, it provides superior resistivity even at elevated temperatures where other materials become conductive. Its dense, non-porous structure makes it ideal for high-vacuum applications, ensuring no gas permeability or outgassing. Whether used as a protective sleeve for sensors in a chemical reactor or as a high-voltage standoff, our 99 alumina sleeves offer a reliable, long-term solution with exceptional durability.
Key Features:
Premium Electrical Isolation: High dielectric strength ensures safety in high-voltage and high-frequency applications.
Superior Thermal Performance: Maintains mechanical integrity and insulating properties at extreme temperatures.
Wear & Corrosion Resistance: Resists aggressive chemical environments and physical abrasion.
Precision Surface Finish: Can be ground to a high finish to ensure airtight seals and minimize friction.
Cost-Effective Durability: Offers a much longer lifespan than polymers or lower-grade ceramics in harsh conditions.
