Product Overview
The ZMSH KY Sapphire Crystal Growth Furnace is a high-temperature crystal growth system designed for large-size sapphire single crystal production, supporting crystal weights from 80 kg to 400 kg using the Kyropoulos (KY) growth method.
The furnace is optimized for controlled sapphire solidification under low thermal stress conditions. By combining stable thermal field design, precise temperature regulation, and ultra-high vacuum and gas atmosphere control, the system enables the growth of high-quality, low-defect sapphire single crystals suitable for semiconductor, optical, and advanced industrial applications.
Compared with conventional Czochralski (CZ) growth systems, the KY method significantly reduces internal stress and dislocation density, making it more suitable for large-diameter and thick sapphire crystal production.
Kyropoulos Growth Technology
The Kyropoulos method allows sapphire crystals to grow slowly within the melt with minimal mechanical pulling. The crystal remains largely supported by buoyancy, enabling:
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Lower thermal gradients
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Reduced mechanical stress
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Improved crystal structural uniformity
This growth approach is particularly effective for producing large, thick sapphire boules with stable optical and mechanical properties.
Crystal Growth Capability
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Crystal weight range: 80–400 kg
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Crystal diameter: 10–500 mm
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Crystal thickness: 50–300 mm
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Growth rate: 0.1–5 mm/h (adjustable)
The furnace configuration can be customized to match specific crystal size targets and downstream wafer or component requirements.
Key Technical Advantages
Stable Thermal Field Control
The furnace employs a well-balanced thermal field design with high-precision temperature regulation. Temperature stability within the growth zone helps suppress thermal stress, minimize cracking risk, and improve crystal yield.
High-Purity Growth Environment
Operation under ultra-high vacuum (≤1×10⁻⁶ Pa) and controlled argon / hydrogen gas atmosphere ensures low contamination levels and stable melt conditions throughout long growth cycles.
Non-Contact Crystal Growth Process
The KY method minimizes mechanical interaction between the seed crystal and pulling system, reducing the risk of contamination and structural defects.
Scalable Industrial Design
The system supports both medium-scale and large-scale sapphire crystal growth and can be adapted for different crystal sizes through modular furnace configuration.
Typical Applications
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Sapphire substrates for semiconductor processing
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Optical windows and laser components
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LED and optoelectronic materials
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Infrared and high-temperature optical systems
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Protective windows for harsh environments
Technical Specifications
General Furnace Parameters
| Item | Specification |
|---|---|
| Growth Method | Kyropoulos (KY) |
| Crystal Weight Range | 80–400 kg |
| Crystal Diameter Range | 10–500 mm |
| Crystal Thickness Range | 50–300 mm |
| Growth Rate | 0.1–5 mm/h |
| Heating Temperature Range | 2000–2200°C |
| Heating System | High-temperature resistance heating |
| Crucible Type | Quartz crucible |
| Gas Atmosphere | Argon / Hydrogen mixture |
| Vacuum Level | ≤1 × 10⁻⁶ Pa |
| Furnace Dimensions | Approx. 1200 × 800 × 1500 mm |
| Power Supply | Industrial high-power AC system |
Crystal Quality and Material Performance
The sapphire crystals grown using the ZMSH KY furnace exhibit:
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High optical transparency across a wide spectral range
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Low dislocation density and uniform crystal structure
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Excellent thermal stability and mechanical strength
These properties make the crystals suitable for high-performance optical and electronic applications requiring long-term reliability.
Industrial Reliability
The furnace is designed for long-duration growth cycles and continuous industrial operation. Robust mechanical structure, stable control systems, and reliable vacuum and gas handling ensure consistent performance across multiple production runs.
ZMSH Engineering Services
ZMSH provides comprehensive technical support, including:
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Customized furnace configuration based on crystal size and production capacity
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On-site installation and commissioning
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Operator training and process guidance
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Long-term maintenance and after-sales service
Our engineering team works closely with customers to optimize sapphire growth processes and ensure stable, repeatable production performance.
FAQ
Q1: What advantages does the KY method offer compared with the CZ method?
A: The KY method produces lower thermal stress and reduced dislocation density, making it more suitable for large-diameter and thick sapphire crystal growth compared with conventional CZ processes.
Q2: What crystal sizes can be produced with this furnace?
A: The system supports sapphire crystal growth from 80 kg up to 400 kg, with diameters up to 500 mm and thicknesses up to 300 mm, depending on configuration.
Q3: Is the furnace suitable for industrial-scale sapphire production?
A: Yes. The furnace is designed for industrial operation with stable thermal control, reliable vacuum and gas systems, and consistent crystal quality across long growth cycles.
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