Production Description:

Gas-pressure sintering furnace,which is also known as high-temperature high-pressure sintering furnace,is an experimental equipment commonly used in the sintering of ceramics, powder metallurgy, and other fields. It is specifically designed for the high-temperature, high-pressure sintering of special materials under a gas pressure of ≤9.8 MPa. It is widely used in the special materials industry for sintering EC ceramics (such as silicon carbide, zirconia, alumina, silicon nitride, etc.) and metal materials (such as cemented carbide) under high-pressure protective atmospheres. It is suitable for universities, research institutions, and industrial and mining enterprises for experimentation and mass production, contributing to increased sintering density and improved mechanical properties of materials. It can be used for tools, turbine rotor blades, and engine applications; silicon nitride and ultra-high-temperature alloy materials sintered in gas pressure furnaces are suitable for manufacturing corrosion-resistant and high-temperature-resistant mechanical parts.

Structural Overview:

1.The gas pressure sintering Furnace mainly consists of a furnace body, heating system, water cooling system, vacuum system, gas charging and pressure system, and temperature control system.

2.The furnace body adopts a double-layer water-cooled structure with water cooling in the middle to keep the furnace shell temperature below 60°C.

3.The insulation materials inside the furnace can be carbon felt and graphite, molybdenum sheets and stainless steel, with the inner layer being a pressure container. The furnace sides are equipped with interfaces for gas inlet/outlet, vacuum pumping, thermocouples, pressure sensors, safety valves, electrodes, etc.

4.Cooling water enters through a main pipe and is distributed to various parts of the furnace that require cooling through branch pipes, before being collected and discharged through a main return pipe. Each cooling water path has a manual valve for adjusting the flow rate as needed. The inlet pipe is equipped with a cooling water detection device, and when the water pressure is too low or there is no cooling water flow, the control system will issue an audible and visual alarm and automatically cut off the heater power through electrical control interlocking.

5.The vacuum pump system consists of a single-stage vacuum pump (a Roots pump can also be added to shorten the vacuum pumping time), high-pressure ball valves, and vacuum piping.

6.It features automatic detection, manual control for pressure increase/decrease, and safety devices such as over-pressure and audible/visual alarms. The furnace is equipped with a pressure limiter and an automatic exhaust safety valve. When the furnace pressure exceeds a certain value, the safety valve automatically exhausts to keep the furnace pressure within the process range.

7.The control circuit is composed of a high-current transformer, power regulator, touch screen, and temperature and pressure controller. This system has functions such as soft start, constant current, and over-current protection, and is equipped with automatic interlocking and alarm protection for low water pressure, over-temperature, and over-current. The alarm status is indicated through audible and visual signals.

Main Technical Parameters:

Equipment Introduction:

Gas-pressure furnace is mainly consist of the heating system (including heat element and electric furnace identity), vacuum system, air inflation and gas pressure regulator, electric control system.

The furnace stack is consist of the furnace door，furnace body, heat insulation shell and heater，stock platform,etc.The furnace door is assembled and welded from a double-layer head and flange, adopting a double-walled structure with circulating cooling water for cooling inside and outside the heads. The inner head of the furnace door is made of stainless steel. The furnace body is constructed from inner and outer furnace cylinders made of stainless steel; it is equipped with electrode lead-out devices, thermocouple temperature measurement devices, as well as gas inlet and outlet holes. The furnace door is connected to the furnace body via hinges, and the furnace door opens sideways. The furnace door is also equipped with an observation hole and a door tightening device.

The heater also adopts square structure type and is installed on both sides of the square heat insulation screen; The heater uses graphite plate as heating body, which is easy to disassemble and maintain. The insulation materials of the heater are all made of high purity boron nitride. The bearing frame is made of graphite material.

The thermal insulation screen is made of graphite and carbon felt material, the structure type is square thermal insulation screen, which is divided into six layers, from inside to outside, the first layer is graphite hard felt material, the thickness is 50mm, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer are made of carbon blanket as insulation material.