Main Technical Parameter:

　　1. Melting Material Capacity: 2Kg (based on indium with a density of 7.3g/cm³)

　　2. Operating Temperature: 500℃

　　3. Design Temperature: 800℃

　　4. Crucible Material: Ultra-high Purity Graphite

　　5. Heating Method: Graphite Heating

　　6. Electrode Center Distance/Quantity: 300mm (one pair)

　　7. Power: 30KW

　　8. Ultimate Vacuum Degree of Cold Furnace: ≤6.67*10^-2 Pa

　　9. Leakage Rate Of Cold Furnace: ≤10Pa/h

　　10. Furnace Chamber Design Pressure: ≤0.03MPa

　　11. Seed Crystal Pulling Speed Range: 2~80mm/h

　　12. Seed Crystal Rod Rapid Rise/Descent: ≥100mm/min

　　13. Seed Crystal Rod Rotation Speed Range: 1~50rpm

　　14. Crucible Stroke: 150mm

　　15. Crucible Rotation Speed Range: 5~15rpm

　　16. Lowering Rod Rapid Rise/Descent: 50mm/min

　　17. Water Cooling System: Outdoor Closed-loop Circulating Cooling System, Flow Rate 5m³/h

　　18. Temperature Control Precision: ±1℃

Structural and Performance Description

      The SG-GJL800 Single Crystal Pulling Furnace mainly consists of the following parts:

Furnace Body:

The vacuum furnace chamber has dimensions of Φ400*700mm, with a double-layer water-cooled wall made of 304 stainless steel. The furnace door opens sideways and is equipped with a water-cooled quartz observation window.

Vacuum System:

To meet user process requirements, a diffusion pump unit is provided.

The vacuum valve is a vacuum butterfly valve, and an electromagnetic vacuum differential pressure release valve is installed at the mechanical pump's suction port.

 Vacuum Gauge: 

The vacuum gauge is used to measure the vacuum degree. The equipment is equipped with both a pressure vacuum gauge (installed on the vacuum pipeline connected to the furnace body) and a thermocouple vacuum gauge. A vacuum silicon tube is installed on the pipeline connecting the furnace's exhaust port and the vacuum butterfly valve to measure the vacuum degree.

Pulling Mechanism: 

The mechanism adopts a ball screw and guide rail to drive the linear motion of the moving platform. Weight control is achieved using a strain gauge sensor. The pulling speed and rotation speed are set on the touch screen, which also features fault alarms, alarm records, data recording, automatic power-off handling, overpressure alarms, etc. Data can be copied to a USB drive for computer analysis.

Heating System: 

The heat shield is made of graphite and carbon felt, adopting a circular structure. The heater, also of a circular graphite structure, is installed around the circular heat shield to form an integral unit. The heater is connected to the graphite heating element using copper electrodes, facilitating easy disassembly and maintenance.

Electric Control System:

The system features a Kunlun Tongtai 10-inch LCD touch screen for data storage and output. Data can be copied to a computer via a USB drive, and real-time curves are displayed on the screen. This makes program setting faster, equipment status more intuitive, and operation more convenient through a graphic and text interface. Data can be copied to a computer via the USB interface for long-term storage, and multiple heating curves can be preset. The temperature control precision is ±1℃. Combining expert modules and control algorithms achieves precise temperature control and effectively resisstant temperature overshoot. The over-temperature alarm system features main circuit cutoff, audiovisual alarms, and automatic recovery and removal functions.

Experimental Furnace from Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences - Quality Advantages:

1.Furnace Shell and Chamber

① Double-layer high-quality carbon steel plate with surface rust-resistant and high-temperature resistant paint treatment.

② Beautiful and energy-efficient high-temperature furnace chamber made of polycrystalline alumina fibers.

2.Electrical Components and Temperature Control

① All electronic components are from Delixi, and the thyristors are originally manufactured in Japan or Germany.

② For safe and efficient use, an imported all-copper isolated transformer is adopted.

③ Temperature control and detection are fully implemented using:

④ Single platinum-rhodium (Type S) for temperatures ≤1500℃;

⑤ Double platinum-rhodium (Type B) for temperatures ≤1800℃.

3.Research Team

Senior engineers, masters, and doctors from the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences can assist your company or research institute in selecting the appropriate experimental furnace and collaborate with senior designers to develop a high-temperature furnace design plan.