The silicon carbide (SiC) horizontal process tube is designed for high-temperature LPCVD, CVD, diffusion, oxidation, and annealing applications in semiconductor, photovoltaic, and advanced materials manufacturing.

As the core reaction chamber component in horizontal thermal processing systems, the process tube directly affects temperature uniformity, contamination control, process stability, and overall equipment lifetime.

Our SiC horizontal process tubes are manufactured using advanced monolithic 3D printing technology combined with ultra-high-purity CVD silicon carbide coating. The seamless one-piece structure eliminates welding joints and assembly-related weak points, greatly improving mechanical reliability and leak resistance under continuous high-temperature operation.

Compared with conventional quartz process tubes, silicon carbide offers significantly higher thermal conductivity, better thermal shock resistance, superior corrosion resistance, and longer operational lifetime, especially in aggressive oxidizing and chlorine-containing process environments.

The product is optimized for semiconductor-grade clean processing environments requiring low particle generation, low metal contamination, and stable thermal performance up to 1250°C.

Key Features

Monolithic One-Piece SiC Structure

The integrated 3D-printed silicon carbide body eliminates seams, brazing points, and potential leakage paths found in traditional assembled structures.

Benefits include:

• Higher structural stability
• Improved vacuum integrity
• Better dimensional consistency
• Reduced thermal stress concentration

Ultra-High Purity CVD SiC Coating

The dense CVD silicon carbide coating provides:

• Surface impurities below 5 ppm
• Excellent chemical inertness
• Reduced particle contamination
• Superior resistance to oxidation and chlorine-bearing gases

This makes the process tube suitable for advanced semiconductor thermal processing applications.

Excellent Thermal Conductivity

Silicon carbide provides much higher thermal conductivity than quartz or alumina, helping achieve:

• Faster thermal response
• Improved axial and radial temperature uniformity
• Stable wafer processing conditions

Outstanding Thermal Shock Resistance

The tube can withstand repeated rapid heating and cooling cycles without cracking, deformation, or coating spallation.

Long Service Life

Compared with quartz process tubes, SiC tubes offer:

• Longer replacement intervals
• Lower maintenance frequency
• Reduced chamber downtime
• Improved total cost of ownership (TCO)

Typical Applications

Semiconductor Manufacturing

Suitable for:

• LPCVD systems
• CVD deposition equipment
• Oxidation furnaces
• Diffusion furnaces
• Annealing systems
• Wafer thermal treatment processes

Photovoltaic Industry

Used in:

• Solar cell diffusion processing
• Surface passivation
• Thin-film deposition
• High-temperature wafer treatment

Advanced Materials Processing

Applicable to:

• Carbonization processes
• Nitridation treatment
• Functional thin-film formation
• Surface activation and modification

Process Compatibility

Compatible Process Atmospheres

• Oxygen (O₂)
• Nitrogen (N₂)
• High-purity inert gases
• Controlled chlorine-containing gases
• Oxidizing atmospheres

Typical Process Window

Parameter	Specification
Maximum Continuous Operating Temperature	1250°C
Pressure Range	LPCVD Vacuum to Near Atmospheric
Thermal Shock Resistance	Excellent
Leak Tightness	≤ 1×10⁻⁹ Pa·m³/s
Surface Roughness	Ra ≤ 0.8–1.6 µm
Coating Purity	＜ 5 ppm
Substrate Impurity	＜ 300 ppm

Technical Specifications

Item	Specification
Product Name	Silicon Carbide Horizontal Process Tube
Material	High Purity Silicon Carbide
Coating	CVD SiC Coating
Manufacturing Process	Monolithic 3D Printing
Maximum Operating Temperature	≤ 1250°C
Thermal Conductivity	High
Thermal Shock Resistance	Excellent
Corrosion Resistance	Excellent
Surface Roughness	Ra ≤ 0.8–1.6 µm
Coating Impurities	＜ 5 ppm
Leak Tightness	≤ 1×10⁻⁹ Pa·m³/s
Typical Applications	LPCVD / CVD / Diffusion / Oxidation

Advantages Over Traditional Process Tubes

Property	SiC Process Tube	Quartz Tube	Alumina Tube
Thermal Conductivity	High	Low	Low
Thermal Shock Resistance	Excellent	Weak	Moderate
Corrosion Resistance	Excellent	Moderate	Good
Particle Control	Excellent	Moderate	Moderate
Service Life	Long	Short	Medium
High-Temperature Stability	Excellent	Moderate	Good

Customization Options

Custom specifications are available according to customer equipment requirements, including:

• Tube diameter and length
• Wall thickness optimization
• Flange and interface structures
• Functional gas ports
• Inner/outer coating configurations
• Surface polishing grades
• Cleanliness standards

FAQ

Q1: Why choose silicon carbide instead of quartz process tubes?

Silicon carbide provides higher thermal conductivity, lower contamination, better thermal shock resistance, and significantly longer service life than quartz, especially in high-temperature semiconductor processes.

Q2: What processes are compatible with this tube?

The tube is suitable for LPCVD, CVD, diffusion, oxidation, annealing, passivation, and other high-temperature thermal processing applications.

Q3: Can the tube operate in chlorine-containing atmospheres?

Yes. The CVD SiC coating offers excellent resistance to controlled chlorine-bearing process environments.