Product Description:

　　The gas-pressure graphite sintering furnace is primarily used by enterprises for hot isostatic pressing (HIP) sintering of EC ceramics (such as silicon carbide, zirconia, alumina, silicon nitride, etc.) and metallic materials (such as carbide alloys) under high-pressure protective atmospheres. It is suitable for experimentation and batch production in universities, research institutions, and industrial and mining enterprises. This furnace helps increase the sintering density and enhance the mechanical properties of materials. Ceramics like silicon nitride and silicon, after sintering in this equipment, exhibit excellent mechanical properties and can be used in tools, turbocharger rotors, and engines. Silicon nitride and ultra-high-temperature alloy materials sintered in this gas-pressure furnace are suitable for making corrosion-resistant and high-temperature-resistant mechanical parts.

Structural Introduction:

　　The gas-pressure graphite sintering furnace consists of an electric furnace heating system (including heating elements and the furnace body), a water cooling system, a vacuum system, a gas filling and pressure display system, and an electrical control system.

　　Electric Furnace Structure: The furnace body adopts a double-layer water-cooled structure to keep the furnace shell temperature below 60℃. The inner and outer furnace cylinders are made of Q345r steel plates. The furnace body is equipped with electrode lead-out devices, thermocouple temperature measurement devices, gas filling holes, and exhaust holes. The furnace cover opens in an upward direction, and there are pressing devices on the furnace cover or the furnace bottom.

　　The heat shield is made of graphite and carbon felt materials in a circular shape. From the inside out, it consists of graphite hard felt and graphite felt as thermal insulation materials. The heater also adopts a circular structure and is installed around the circular heat shield, forming a circuit. The heater uses graphite carbon tubes as heating elements, which are easy to dismantle and repair. The insulating materials of the heater are all high-purity boron nitride.The material support is processed from graphite materials. The inner layer is a pressure vessel, and thermocouples are designed on the side of the furnace body for segmented automatic temperature control.

　　Water Cooling System: Cooling water enters through the main pipe and is sent to various parts of the furnace that require cold water through branch pipes, then collected into the main return water pipe for discharge. Each cooling water circuit has a manual valve to adjust the cooling water flow as needed. A cooling water detection device is installed on the water inlet pipe. When the water pressure is too low or there is no cooling water flow, the control system will sound an audible and visual alarm and can automatically cut off the heater power through the interlocking function of electrical control (water source to be provided by the buyer).

　　Vacuum System: It employs Roots pumps and directly connected pumps to shorten the vacuuming time, complemented by vacuum butterfly valves and vacuum piping. An electromagnetic pressure differential valve is installed on the vacuum pump to prevent oil return after a power outage.

　　Gas Filling and Pressure Control System: The pressure inside the furnace is displayed on the screen through a pressure sensor. When the pressure exceeds the set value, an audible and visual alarm is triggered. When it exceeds the safe value, the safety valve automatically opens to vent, ensuring equipment safety.

　　Electrical Control System: The control circuit consists of a high-current transformer, power regulator, touchscreen, temperature and pressure controller, etc. This system features soft start, soft stop, constant current, overcurrent protection, and other functions. It also includes automatic interlocking and alarm protection for underpressure of water pressure, overtemperature, and overcurrent. The alarm status is indicated in an audible and visual manner.

Main Technical Parameters:

　　1.Heating Element: The graphite heating system features a vertical structure with an openable top cover.

　　2.Maximum Temperature: 2000℃, with a long-term operating temperature of 1950℃ (holding time: 4-12h).

　　3.Effective Heating Zone: Φ300×300mm (diameter × height).

　　4.Gas Charging Pressure: ≤6Mpa.

　　5.Ultimate Vacuum Degree: ≤5Pa (cold state, no load).

　　6.Vacuum System Configuration: Roots pump + direct-connected pump.

　　7.Temperature Control Mode: PLC + Digital Display Temperature Programmer.

　　8.Gas Medium: Argon: Nitrogen.

　　9.Temperature Control Range: Measured by Tungsten-Rhenium Thermocouple.

　　10.Temperature Control Accuracy: ≤±1℃.

11.Electrical Interlock and Display: Over-temperature, over-current interlock protection, and alarm (audible and visual). Voltage and current display.