Introduction of hot pressing sintering furnace
A Hot Pressing Sintering Furnace is an advanced material processing equipment that simultaneously applies uniaxial mechanical pressure under high-temperature, high-vacuum, or protective-atmosphere conditions. By leveraging the combined effects of temperature, pressure, and time, it significantly enhances diffusion and densification between powder particles, enabling the production of bulk materials with near-theoretical density, fine grain structure, and superior performance—often at lower temperatures or in shorter durations compared to conventional sintering methods.
Working principle of hot pressing sintering furnace
The hot pressing (HP) process typically includes the following steps:
Powder Loading: The pre-compacted powder compact is placed into a graphite die.
Vacuum Evacuation / Atmosphere Purging: Air and impurity gases (e.g., O₂, H₂O) are removed to prevent oxidation.
Simultaneous Heating and Pressing: As the furnace reaches the set temperature (typically 1600–2200°C), uniaxial pressure (usually 10–50 MPa, and up to over 80 MPa in some systems) is applied via a hydraulic or pneumatic system.
Soaking under Pressure: The material is held at high temperature and pressure for a period to complete densification.
Cooling and Depressurization: The sample is cooled under protective atmosphere to a safe temperature before removal.
Technical Features of Vacuum Hot Pressing Furnace
The vacuum hot pressing furnace features a horizontal, single-chamber, cold-wall, front-loading structure.
All processes except loading and unloading are fully automatic, digitally and intelligently controlled with no manual intervention required.
Equipped with an external-circulation rapid cooling system operating under gas pressure of 2 to 15 bar, ensuring fast cooling of workpieces after hot pressing for high operational efficiency.
The furnace can operate not only under vacuum, but also under positive-pressure atmospheres such as H₂ or Ar, which significantly improves the pressing quality for materials like CuZnSn-based powders and similar compounds.
The hot zone of the pressing chamber is designed based on thermal simulation under operating conditions, achieving exceptional temperature uniformity. Heating elements and insulation layers feature a modular, optimized design.
The pressing chamber incorporates a load-bearing frame press structure, with one or multiple hydraulic cylinders mounted on both upper and lower sections, enabling precise alignment and bidirectional pressing.
Press ram flatness accuracy is as high as ±5 μm.
At high temperatures up to 2400°C, the press ram can maintain constant pressure for up to 12 hours with high-precision pressure stability.
Real-time digital values and graphical curves for both pressure and displacement are displayed on the computer interface.
Pressing mode is selectable: unidirectional or bidirectional.
Press control options include servo-controlled hydraulic motor or proportional valve flow control.
Thermal insulation options: graphite multi-layer insulation or all-metal radiation shield.
Available loading capacities: 30T, 50T, 100T, 200T, 400T, 500T, 800T, 1000T, and 2000T.
Maximum operating temperatures: 1500°C, 1800°C, 2000°C, 2300°C, 2400°C, and 2500°C.
Press ram material options: isostatically molded graphite or TZM alloy.
Model of Vacuum Hot Pressing Furnace
