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SiC Coated Upper Graphite Barrel for SiC Epitaxy
SiC Coated Upper Graphite Barrel for SiC Epitaxy is a key component in the epitaxial growth process of silicon carbide (SiC) wafers. Manufactured by Semixlab, this barrel combines high-purity isostatic graphite with a dense CVD SiC coating, providing outstanding thermal stability, corrosion resistance, and surface uniformity — essential for ensuring the high crystalline quality of SiC epitaxial layers. Looking forward to your further consultation.
Description
Material and Performance Characteristics
The core graphite is produced from ultra-fine isostatic carbon, offering low porosity and excellent mechanical integrity under high temperatures.
The SiC coating is deposited through Chemical Vapor Deposition (CVD), forming a dense, uniform, and tightly bonded protective layer with the following key features:
● High Purity & Chemical Inertness: Prevents contamination during SiC epitaxial growth, ensuring a clean and stable reaction chamber.
● Superior Thermal Stability: Withstands temperatures above 1600°C and maintains dimensional precision.
● Excellent Corrosion and Erosion Resistance: Protects against reactive gases such as H₂ and SiH₄ commonly used in SiC epitaxy.
● Strong Adhesion and Surface Smoothness: Guarantees minimal particle generation and stable wafer rotation during epitaxial deposition.
Challenges & Semixlab’s Solutions
| Challenge | Cause | Semixlab Solution |
| Coating peeling or delamination | Mismatch in thermal expansion between graphite and SiC layer | Utilization of gradient CVD process and precision surface pretreatment to enhance coating adhesion |
| Surface contamination | Gas impurities or coating micro-defects | Adoption of high-purity SiC source materials and post-coating purification |
| Thermal distortion under repeated heating | Uneven heat distribution or graphite fatigue | Custom-optimized barrel geometry and use of isotropic graphite to improve mechanical strength |
| Reduced lifespan in corrosive environments | H₂ or SiH₄ gas erosion | Application of thickened SiC protective layer (≥100 µm) with dense crystal structure |
Semixlab’s Sic Coated Upper Graphite Barrel provides reliable protection and stability in sic epitaxy processes, enhancing wafer quality and reactor performance. Designed for high-temperature, high-purity, and long-term operation, it stands as a critical component for next-generation power semiconductor manufacturing. Reach out for technical consultation or customized design support.
Applications
Applications in SiC Epitaxy
The SiC Coated Upper Graphite Barrel is installed at the upper region of SiC epitaxy reactors (e.g., AIXTRON, LPE, or Veeco systems) and plays a critical role in controlling the thermal field distribution and gas flow uniformity. Its main functions include:
● Maintaining thermal balance between the upper and lower reactor zones to ensure uniform epitaxial layer thickness.
● Preventing direct chemical interaction between graphite and process gases, thereby extending component lifespan.
● Enhancing reactor cleanliness, reducing particle contamination during multiple epitaxial runs.
Through optimized design and precision machining, Semixlab’s barrel contributes to consistent wafer quality, improved yield rates, and reduced maintenance frequency in SiC epitaxy systems.
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