High-Purity Alumina Ceramic Parts for Semiconductor & Industrial Applications
St.Cera manufactures precision-machined alumina (Al₂O₃) ceramic parts to customer specifications. Using 99.8% high-purity alumina, these components deliver excellent flexural strength (361 MPa), high hardness (16 GPa), and outstanding dielectric strength (15×10⁶ V/m). Designed for semiconductor equipment, wear-resistant assemblies, electrical insulators, and high-temperature fixtures, the material offers near-zero water absorption (0%) and a thermal expansion coefficient of 7.2×10⁻⁶/℃, ensuring dimensional stability under extreme conditions.
Specifications (based on 99.8% Al₂O₃):
Property |
Value |
| Material | 99.8% Alumina (Ivory) |
| Density | 3.93 g/cm³ |
| Flexural Strength | 361 MPa |
| Fracture Toughness | 3–4 MPa·m¹/² |
| Vickers Hardness | 16 GPa |
| Young‘s Modulus | 380 GPa |
| Thermal Conductivity | 32 W/m·k |
| Thermal Expansion (25–1000°C) | 7.2×10⁻⁶/℃ |
| Dielectric Constant | 9.6 |
| Dielectric Loss Angle | 0.0001 |
| Dielectric Strength | 15×10⁶ V/m |
| Specific Resistance | >10¹⁴ Ω·cm |
| Max Operating Temperature | 1600°C |
Applications:
- · Semiconductor process chamber liners, viewports, and gas distribution plates
- · Wear-resistant bushings, seal rings, and bearing balls
- · High-voltage electrical insulators and spark plug insulators
- · Furnace fixtures, heater supports, and thermocouple protection tubes
Manufacturing Process:
Isostatic pressing → green machining → sintering at 1600°C → CNC precision grinding / lapping → ultrasonic cleaning → 100% CMM dimensional inspection. Complex geometries, thin walls (≥0.5 mm), and tight tolerances (down to ±0.01 mm) are routinely achieved.
Quality Control:
ISO 9001:2015 certified. Each batch is tested for flexural strength (3 point bend), hardness (Vickers), dielectric strength (ASTM D149), and thermal shock resistance (10 cycles, 25°C ↔ 1000°C). No cracks or chips visible under 20× microscopy.
Advantages over Metal or Polymer Parts:
- · 3–5× harder than stainless steel (16 GPa vs. ~2 GPa)
- · Chemically inert — resistant to acids, alkalis, and halogens (except HF)
- · Electrical insulator >10¹⁴ Ω·cm, enabling use in high-voltage environments
- · Continuous service up to 1600°C, far exceeding the limits of metals or plastics
Customization:
We accept customer drawings (STEP/IGS format) and offer rapid prototyping (2–3 weeks). Parts can be supplied as sintered, ground, lapped, or polished (Ra ≤0.05 μm). Edge rounding, counterbores, threaded holes, and vacuum grooves are available.
Note: For applications requiring higher fracture toughness, consider zirconia (ZrO₂) parts. For highest thermal conductivity, refer to our BeO or Si₃N₄ products. All data above strictly follows the supplied Al₂O₃ property table (99.8% grade).
