High Purity Alumina Ceramic Block for Precision Machining and Industrial Use

﹡Product Overview

Our 99.5% pure alumina (Al₂O₃) ceramic blocks are engineered for precision machining, extreme wear resistance, and superior thermal stability in demanding industrial applications. Available in standard and custom dimensions with tight tolerances.

﹡Key Technical Specifications

✅ Material Purity: 99.5% Al₂O₃ – <100ppm impurities

✅ Density: 3.9 g/cm³ – >99.5% theoretical density

✅ Hardness: 1,500 HV (Mohs 9) – 3× harder than tool steel

✅ Flexural Strength: 350-400 MPa

✅ Compressive Strength: 2,600-3,000 MPa

✅ Thermal Properties:

Max Operating Temp: 1,600°C (2,912°F)

Thermal Conductivity: 28-35 W/(m·K)

Thermal Shock Resistance: ΔT >500°C

✅ Electrical Properties:

Dielectric Strength: 18-22 kV/mm

Volume Resistivity: >10¹⁴ Ω·cm

✅ Standard Sizes:

Thickness: 5-100mm (±0.05mm)

Width/Length: 50-500mm (custom up to 800mm)

✅ Surface Finish Options:

As-fired: Ra 0.5-0.8µm

Precision ground: Ra 0.2µm (±0.02µm)

Mirror polished: Ra <0.05µm

﹡Industry Applications

1. Semiconductor Manufacturing

Plasma etch chamber components – Non-contaminating, RF-transparent

Wafer chucks & stages – Ultra-flat surface (≤0.01mm/m flatness)

2. Precision Machinery

Coordinate measuring machine tables – Zero thermal expansion

Optical instrument bases – Vibration damping properties

3. Chemical Processing

Reaction vessel liners – Resists 50% H₂SO₄, 30% NaOH

Pump housing inserts – Abrasion-resistant flow channels

4. High-Temperature Furnaces

Kiln furniture setter plates – Withstand 1,500°C cycling

Thermocouple protection blocks – Molten metal resistance

5. Medical Technology

MRI-compatible fixtures – Non-magnetic properties

Surgical tool components – Autoclavable, ISO 6474 compliant

﹡Competitive Advantages

✔ Ultra-High Purity – <50ppm metallic impurities for sensitive applications

✔ Exceptional Flatness – ±0.02mm/m precision grinding

✔ Custom Solutions – Prototype to production services

✔ Cost Efficiency – 50% longer service life than zirconia

﹡Production process

1. Grind and crush the raw materials to be slurry or powder

2. se-different method to making the slurry or powder into semi-finished products

3. Put the semi-finished products into the kiln for dewaxing and sintering;

4. After forming and sintering, Ceramic Sleeves products can also be processed by subsequent CNC precision machining according to the drawing requirements. Then Q/C test.

5. Finally package Ceramic Sleeves by bubble paper or cartons and place it on tray for delivery

﹡Certifications

﹡Company

Yixing Shengda Refractory Ceramic Co, Ltd. was established in Yixing City, China in 1995, witha production area of over 10,000m2. lt is an enterprise specializing in the production of aluminaceramic,zirconia ceramic,slicon nitride, silicon carbide and other precision ceramic products. 

And we also produce ceramic band heaters, ceramic terminal block, cordierite and mullite ceramic parts an other ceramic products.

﹡Ceramic Properties