The 99% Alumina Ceramic Gas Distribution Seat is a high-performance precision ceramic component designed for ultra-stable gas flow control in advanced industrial systems. It is manufactured from high-purity 99% aluminum oxide (Al₂O₃), offering outstanding mechanical strength, chemical stability, and electrical insulation performance.
This component is widely used in semiconductor manufacturing equipment, vacuum coating systems, plasma etching chambers, CVD and PECVD systems, and high-purity gas distribution modules.
Its core function is to ensure uniform and stable gas diffusion across process chambers, reducing process variation, improving yield consistency, and minimizing contamination risks. Compared with metal, quartz, or lower-grade ceramics, 99% alumina provides significantly superior wear resistance, dimensional stability, and long-term reliability.
Material Focus: 99% High Purity Alumina (Al₂O₃ ≥ 99%)
This product is made from high-density 99% alumina ceramic, which is considered one of the most stable and widely used advanced engineering ceramics in precision industrial environments.
Key material characteristics:
- Extremely high hardness for long-term wear resistance
- Excellent resistance to plasma, acids, and alkaline environments
- High electrical insulation for high-voltage and plasma systems
- Superior dimensional stability under thermal cycling
- Very low particle generation for cleanroom applications
- Long service life in continuous industrial operation
Compared with 95% alumina, 99% alumina provides higher hardness, better wear resistance, and improved structural stability, making it more suitable for high-end semiconductor and precision coating systems.
Functional Design Principle
The ceramic gas distribution seat is engineered with a precisely controlled porous structure or micro-channel system. This structure allows controlled diffusion of process gases inside vacuum or reaction chambers.
Core functions include:
- Uniform gas distribution across the entire process surface
- Stable pressure balancing for consistent process conditions
- Reduction of turbulence and localized flow concentration
- Improved thin film deposition and etching uniformity
- Minimization of particle contamination and process defects
The pore structure can be engineered to match specific flow rates, gas types, and chamber configurations.
Key Performance Advantages of 99% Alumina
- Higher wear resistance compared to 95% alumina and quartz
- Excellent corrosion resistance in plasma and reactive gas environments
- Superior electrical insulation preventing current leakage
- Strong mechanical stability under pressure and vibration
- Excellent thermal stability for high-temperature processing systems
- Ultra-low contamination risk suitable for semiconductor cleanroom use
- Long operational lifetime with reduced maintenance frequency
Material Performance Comparison
| Kiinteistö | 99% Alumina (Al₂O₃ ≥ 99%) | 95% Alumiinioksidi | Zirconia | Steatite |
|---|---|---|---|---|
| Density (g/cm³) | 3.85 | 3.65 | 5.9 | 2.8 |
| Water Absorption (%) | 0 | 0 | 0 | 0 |
| Sintering Temperature (℃) | 1690 | 1670 | 1650 | 1350 |
| Hardness (HV) | 1700 | 1600 | 1400 | 800 |
| Flexural Strength (MPa) | >350 | >290 | >1100 | 90 |
| Compressive Strength (Kgf/cm²) | 30000 | 25000 | 25000 | 4000 |
| Maximum Operating Temperature (℃) | 1500 | 1400 | 1600 | 1100 |
| Thermal Expansion (×10⁻⁶/℃) | 8 | 7.8 | 10 | 6 |
| Thermal Shock Resistance (ΔT ℃) | 200 | 220 | 350 | 200 |
| Thermal Conductivity (W/m·K) | 3 | 2 | 3 | 2.5 |
| Volume Resistivity (Ω·cm) | >10¹² | >10¹² | >10¹² | 10¹² |
| Dielectric Strength (KV/mm) | 18 | 16 | 15 | 10 |
| Dielectric Constant (1MHz) | 9.2–10.5 | 9.0–10 | 12 | 5.8 |
Technical Parameters
| Parametri | Tekniset tiedot |
|---|---|
| Materiaali | 99% high purity alumina (Al₂O₃ ≥ 99%) |
| Structure Type | Porous disc / shower plate / ring |
| Muoto | Round / customized geometry |
| Tiheys | 3.85 g/cm³ |
| Kovuus | ~1700 HV |
| Taivutuslujuus | >350 MPa |
| Puristuslujuus | ≥30000 Kgf/cm² |
| Maksimi käyttölämpötila | Up to 1500°C (depending on environment) |
| Sähköinen resistiivisyys | >10¹² Ω·cm |
| Dielektrinen lujuus | ~18 KV/mm |
| Pinnan karheus | Ra ≤ 0.2 μm (precision areas) |
| Flatness Tolerance | ±5–10 μm |
| Työstön toleranssi | ±0.01 mm |
| Porosity Design | Fully customizable micro-porous structure |
Sovellusalueet
- Semiconductor wafer processing systems
- Plasma etching and cleaning equipment
- PECVD / CVD / PVD thin film deposition systems
- Vacuum gas distribution chambers
- High-purity chemical reaction systems
- Precision industrial furnace gas control systems
- Laboratory high-accuracy gas diffusion equipment
Custom Engineering Options
This 99% alumina ceramic gas distribution seat can be fully customized:
- Outer diameter and thickness
- Porosity density and flow distribution design
- Micro-hole or channel structure optimization
- Surface polishing and finish grade
- Flatness and sealing interface precision
- Integration with metal mounting or sealing structures
- Application-specific gas flow calibration
Engineering support is available for system matching and performance optimization.
Valmistusprosessi
- High-purity 99% alumina powder preparation
- Isostatic pressing or dry pressing forming
- High-temperature sintering at ~1690°C
- CNC precision machining
- Laser or micro-drilling for porous structure (if required)
- Precision grinding and polishing
- Dimensional inspection and leak testing
- Final quality validation
Strict process control ensures consistency, stability, and long-term reliability in high-end applications.
Usein kysytyt kysymykset
Q1: Why choose 99% alumina instead of 95% alumina?
99% alumina offers higher hardness, better wear resistance, and improved chemical stability. It is more suitable for semiconductor-grade and high-precision gas distribution applications where contamination control is critical.
Q2: Can the porous structure be designed according to my equipment?
Yes. The pore size, density, and distribution can be fully customized according to gas type, pressure, and chamber design to achieve optimal flow uniformity.
Q3: Is 99% alumina suitable for plasma environments?
Yes. 99% alumina has excellent plasma resistance and maintains structural stability under long-term exposure to reactive gases and high-energy plasma systems.
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