AJ VAF Series 1600°C Vacuum Atmosphere Furnace Tungsten Heating Furnace

The AJ-VAF series vacuum atmosphere furnace, as shown in the figure, integrates a temperature control system, vacuum chamber, vacuum pump, gas circuit, pressure protection, gas flow control, and positive/negative pressure display, with the water chiller unit separated from the furnace body.
The furnace lining is made of multi-layer tungsten-molybdenum metal reflection screens.
Tungsten sheets are used as heating elements; it is a dedicated device specially developed for laboratories of higher education institutions and research institutes, as well as industrial and mining enterprises, for sintering, melting, analysis, and production of ceramics, metallurgy, electronics, glass, chemicals, machinery, refractory materials, new material development, special materials, building materials, metals, non-metals, and other compound materials.
The control panel is equipped with a touch screen plus PLC intelligent control; intelligent temperature regulation, control of power supply, main heating operation, voltage, current, water pump, vacuum pump, gas flow, positive/negative pressure, electric contact pressure gauge, and valves, so as to observe the working status of the system at any time. This product adopts a reliable integrated circuit, provides a good working environment, and is resistant to interference. At the highest temperature, the outer shell temperature of the furnace body is ≤40°C, greatly improving the working environment. Microcomputer program control allows programmable curves, fully automatic heating/cooling, and modification of temperature control parameters and programs during operation, making it flexible, convenient, and easy to operate.
Temperature control accuracy: ±1°C without overshoot. Constant temperature accuracy: ±1°C. Heating speed is fast, with a maximum heating rate of ≤20/min (nonlinear) * (the upper computer screen locks the input value at 1-10°C/min, while the lower computer retains ≤20°C/min, with input limited) *.

Item Category	Parameter Content
Temperature	Long-term working temperature: 1600℃Control range: 50～1800℃Temperature control accuracy: ±1℃ (integrated circuit control, no overshoot)Furnace temperature uniformity: ±2℃ (depends on heating chamber size)Thermocouple & measuring range: Type C thermocouple, 0～2300℃Heating rate: continuously adjustable; Max 20℃/min (non-linear), Min 1℃/h (non-linear)High-temperature operation: Above 1600℃, control argon flow to maintain chamber pressure at 100～1000Pa to prevent evaporation of heating elements & heat shields
Heating Chamber	Effective hot zone size: 300×200×200 mm (Depth × Width × Height)Heating element: High-purity tungsten sheet (Nitrogen input is strictly prohibited above 800℃)Element layout: Evenly arranged around the chamberHeat insulation: 10 layers of heat shields (3 W + 2 Mo + 2 SUS310S + 3 SUS304)
Furnace Body Structure	Body: CNC machined, polished, pickled, phosphated, powder-coated & high-temperature baked; anti-oxidation, acid & alkali resistant, corrosion-resistant, high-temperature resistant & easy to cleanStructure: Double water-cooled SUS304 structure for stable working conditionDoor opening: Side-opening typeShell temperature: ＜45℃ under continuous non-stop operation (with water temperature monitoring)
Water Cooling System	Components: Stainless steel stop valve, water inlet, drain tank, digital electric contact pressure gaugeConnection: Flange inlet/outlet, directly connected to user’s circulating water systemProtection: Overpressure protection on drain pipe; audible & visual alarm plus interlock upon water cut-off, emergency cooling water will turn on automaticallyChiller: 3PCooling area: Outer wall of furnace body
Vacuum System	Vacuum pumps: 2-stage rotary vane pump 2X-70 (pumping speed 70 L/s) + molecular diffusion pump (1500 L/s, DN400 flange)Vacuum gauges: 1 digital resistance vacuum gauge + 1 digital ionization vacuum gaugeUltimate vacuum: 6.67×10⁻⁴ Pa (cold empty clean furnace)Working vacuum: 6.67×10⁻³ Pa (empty clean furnace)Pressure rise rate: ≤0.66 Pa/h (cold empty furnace, 24h pressure holding)Pumping time: ≤120 min (from atmospheric pressure down to 1×10⁻³ Pa, main valve open)
Pressure & Gas Circuit	Chamber plate: 6～20mm thick, double-sided welding, withstand positive pressure up to 0.1 MPaValves: Imported stainless steel valvesPressure monitoring: 1 digital positive/negative pressure gauge eachFlowmeter: 1 argon mass flowmeter for precise flow controlVent port: 1 electrically controlled vent valve for pressure releasePressure protection: Signal from electric contact pressure gauge / pressure sensor; auto close inlet valve, open exhaust valve and trigger audible & visual alarm to release pressure
Atmosphere System	Available atmospheres: Argon, HydrogenGas filling system: Stop valve + solenoid valve + digital electric contact pressure gauge; vacuum adjustable during heatingGas pipeline: 0～50 L/min mass flowmeterPneumatic system: Pneumatic valve + solenoid valve + oil-water separator + pressure gauge, direct connection to user’s air source
Electric Control System	Control mode: Closed-loop SCR phase-shift trigger; voltage/current/power continuously adjustable, constant voltage / constant current / constant power outputProtection functions: Temperature overshoot, undershoot, thermocouple break, phase loss, overpressure, overcurrent, overtemperature, current feedback, soft start, etc.Control configuration: Dual-loop control & dual-loop protection to secure heating elementsDisplay items: Temperature, segment No., segment time, remaining time, output power %, voltage, current, pressure, gas flow, vacuum degree, etc.Temperature program: Touchscreen intelligent controller, 50-segment program, multi-curve storage & callMain controller: Siemens S7-1200 PLC with expansion modules; controls vacuum pumping, valve interlock, heating logic & fault alarmControl cabinet: Touchscreen monitoring, self-diagnosis, audible & visual alarm + electrical interlock; Temperature controller: Chino FP93 (Japan), control accuracy ±1℃Data recording: Kunlun Tongtai touchscreen, curve recording & program editing for temperature & vacuumTemperature sensor: Sheathed Type C thermocouple, anti-oxidation & anti-carburization
Power Supply Requirements	Voltage: 380V, 50HzRated heating power: 60 KWTotal capacity: 3-phase 380V 50Hz, 90 KVA; dual power supply (control circuit + heating circuit), with matched circuit breakers & cable sizeCooling water: Inlet pressure 0.2～0.3 MPa, inlet temperature ≤32℃, water consumption 3 m³/hCompressed air: 0.4～0.5 MPaProcess gas: Argon / Nitrogen, purity 99.99%～99.9995%
Safety Interlock	Electrical protection: Overvoltage, undervoltage, overcurrent & overtemperature protectionInterlock alarm: Water cut-off, overtemperature & vacuum pump overload with audible-visual alarm and automatic stop
Spare Parts & Documents	Spare parts: 2 fuses, 1 crucible tong, 1 pair of high-temperature glovesDocuments: 1 furnace unit, full set of spares, operation manual, product certificate, factory inspection report, delivery note
Warranty	Whole machine: 1-year free warrantyHeating elements: Not covered by warranty; free replacement for natural failure within 3 months
Power Cable	The Seller supplies power cables matching the full load capacity; each cable length: 10 meters

1600°C VAF Vacuum Atmosphere Furnace

1600°C VAF Vacuum Atmosphere Furnace

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