1600°C VAF Vacuum Atmosphere Furnace for Advanced Heat Treatment

Project Category

Parameter content

model

temperature

Long-term operating temperature: 1600 degrees Celsius

Control range: 50 to 1800 degrees Celsius 

Temperature control accuracy: ±1℃ (integrated circuit control, no overshoot)

Furnace temperature uniformity: ±2℃ ( depending on the size of the heating chamber )

Temperature sensing element and range: Thermocouple type C , temperature range 0-2300 degrees Celsius

Heating rate: Freely adjustable; range: fastest heating rate 20 degrees Celsius per minute (non-linear), slowest heating rate 1 degree Celsius per hour (non-linear) .

High-temperature operation: When the temperature is above 1600 degrees Celsius, the furnace pressure is maintained at 100-1000 Pa by controlling the argon gas flow rate to prevent the heating element and high-temperature reflector from evaporating.

furnace

Furnace dimensions (effective thermal zone): 300×200×200 mm (depth × width × height)

Heating element: High-purity tungsten metal sheet ( nitrogen gas must not be introduced above 800 degrees Celsius)

Heating element installation location: evenly distributed around the furnace chamber

Thermal insulation: The furnace chamber uses 10 layers of reflective screens ( 3 layers of tungsten, 2 layers of molybdenum, 2 layers of 310S , and 3 layers of 304 ).

Furnace body structure

Furnace body: CNC machined, polished, ground, pickled, phosphated, powder coated, and baked at high temperature. It has a beautiful appearance and advantages such as oxidation resistance, acid and alkali resistance, corrosion resistance, high temperature resistance, and easy cleaning.

Furnace body structure: 304 stainless steel water-cooled double-layer furnace body structure to ensure a good working environment.

Furnace door opening method: side opening

Furnace shell temperature: For long-term use without shutting down the furnace, the shell temperature should be less than 45 degrees Celsius (with water temperature detection).

Water cooling system

Components: Stainless steel shut-off valve, water inlet, drain tank, digital display water pressure gauge with electrical contacts.

Interfaces: The inlet and outlet are equipped with flange interfaces, which can be directly connected to the user's circulating water system.

Protection: The drain pipe is equipped with overpressure protection; when the water supply is interrupted, an audible and visual alarm and an interlock device will be activated, and emergency cooling water will be turned on at the same time.

Chiller: 3P

Water-cooled components: around the outer casing

Vacuum system

Vacuum pumps: Two-stage direct rotary vane vacuum pump (2X-70) , pumping speed 70 l/s + molecular diffusion pump, pumping speed 1500 l/s , diameter 400.

Vacuum gauges: 1 digital display resistance vacuum gauge + 1 digital display ionization vacuum gauge

Ultimate vacuum: 6.67 × 10⁻⁴ Pa ( empty furnace, cold and clean state )

Working vacuum level: 6.67 × 10^-3 Pa ( clean empty furnace )

Pressure rise rate (cold state in empty furnace): ≤0.66 Pa/h (calculated after 24 hours of pressure holding )

Pumping rate ( 1×10^-3 Pa , under ambient temperature empty furnace, timing with main valve open): ≤120 min

Pressure and air path

Furnace lining steel plate thickness: 6-20 mm , double-sided welded, capable of withstanding positive pressure of 0.1 MPa.

Pneumatic valves: Imported stainless steel valves

One positive pressure gauge and one negative pressure gauge with digital display.

One argon mass flow meter for precise control of gas flow.

Exhaust port: One electrically controlled exhaust port for breaking airflow.

Pressure protection: A signal is received from a digital display pressure gauge / pressure sensor, automatically closing the intake valve and opening the exhaust valve and alarm to release pressure. An audible and visual alarm buzzer is activated.

Atmosphere system

Possible atmospheres: argon, hydrogen

The inflation system consists of an inflation shut-off valve, a solenoid valve, and a vacuum digital display pressure gauge. The vacuum level can be adjusted during the heating process.

Inflation line: Equipped with a 0~50 L/min mass flow meter, capable of measuring...

Pneumatic system: Consists of pneumatic valves, solenoid valves, oil-water separators, and pressure gauges. It can be connected to the user's air supply interface via an air interface.

Electrical control and control system

Control method: Closed-loop technology, thyristor module triggering, phase-shift triggering control, continuously adjustable output voltage / current / power, with constant voltage, constant current, and constant power characteristics.

Protection functions: overshoot, over-adjustment, under-adjustment, thermocouple interruption, phase loss, overvoltage, overcurrent, overtemperature, current feedback, soft start, etc.

Control precision: Dual-loop control and protection are employed to ensure the safe and reliable operation of the heating element.

Display parameters: temperature, segment number, segment time, remaining time, output power % , voltage, current, pressure, gas flow rate, vacuum level, etc.

Temperature control: Touchscreen intelligent temperature controller, 50- segment programmable control, supports multi-curve input.

Controller: Siemens PLC ( S7-1200 main unit + expansion), realizing functions such as vacuuming, valve control, interlock protection, heating logic control, and alarm.

Control cabinet: Equipped with a touch screen to display operating status, and features fault self-diagnosis, audible and visual alarms, and interlock protection. Temperature controller FP 93 (Japan) , temperature control accuracy ±1℃.

Recording System: Kunlun Tongtai touchscreen for temperature and vacuum chart recording and programming.

Temperature measuring thermocouple: Type C thermocouple, with an armored outer shell to prevent oxidation and carburization.

Power supply and power requirements

Power supply voltage: 380V , 50Hz

Design power: 60 KW

Total power requirements: 380V , 3- phase, 50Hz , 90 KVA (The equipment power supply consists of two circuits: one for system power and one for heating power. Please specify the size of the circuit breakers to be provided by the client, the power of each circuit, and the wire diameter.) 

Water supply: Inlet pressure 0.2 ～ 0.3 MPa , inlet temperature ≤32℃ , water consumption 3 m³/h

Compressed air: The compressed air pressure required for pneumatic components is 0.4 to 0.5 MPa.

Inert gas: nitrogen or argon, purity 99.99–99.9995 %

Safety and Protection

The control system has overvoltage, overcurrent, overtemperature, and undervoltage protection.

Water outage, overheating, vacuum pump overload alarm and interlock protection

Accessories and Documents

2 fuses , 1 crucible tong , 1 pair of high-temperature gloves

Packing list: 1 electric furnace, 2 fuses , 1 crucible tongs , 1 pair of high-temperature gloves , 1 instruction manual , 1 certificate of conformity , 1 acceptance report (factory inspection report) , 1 sales delivery note .

Warranty

1- year free warranty

Heating element: Not covered under warranty (free replacement for natural damage within three months).

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