target, aim at, address, focus on, in response to35T SPSA detailed design scheme for the (discharge plasma sintering) furnace, covering equipment architecture, key technological innovations, process control strategies, and typical application scenarios, suitable for superhard materials such as diamond-Rapid densification sintering of high-performance materials such as metal composite materials, nano ceramics, and high entropy alloys:

1. Core indicators of equipment

Maximum pressure:35Ton (expandable to)50T）

heating rate100-500°C/min(Maximum temperature)2200°C）

真空度：10⁻³Pa(Optional atmosphere:Ar/N₂/H₂）

Pulse current:DCPulse (peak value)5000A, frequency1-10kHz）

Applicable molds:φ20-100mm(Graphite)/Tungsten carbide material)

2. Key module design

(1)pressure-Temperature collaborative system

Oscillatory pressure technology:

frequency0.1-5Hz, amplitude±5%set pressure

Function: Crush particles and agglomerate, promote particle rearrangement (especially for nano powder)

Multi zone temperature control:

Mold axial division3Zone independent heating (temperature difference ＜±10°C）

Using tungsten rhenium thermocouple（W-3%Re/W-25%Re, accuracy±2°C）

(2)Pulse current system

(3)Vacuum and Atmosphere Control

Molecular Pump Unit: Extreme Vacuum10⁻³Pa(Pulling speed)2000L/s）

Gas jet cooling: high pressureArGas quenching (cooling rate>200°C/s）

Oxygen content monitoring:ZrO₂Sensor (detection lower limit)1ppm）

3. Innovative technological highlights

(1)Multi physics coupling sintering

electromagnetic-hot-Force synergy:

passCOMSOLSimulate and optimize the pulse current path (current density deviation<)5%）

pressure-Current phase synchronous control (delay ＜)1ms）

(2)Intelligent process optimization

Machine learning models:

Input: Powder characteristics (particle size, specific surface area, etc.)+Target density

Output: Recommended stress-temperature-Current curve (prediction accuracy>90%）

Digital twin:

Real time comparison between virtual sintering and actual data, dynamically adjusting parameters

(3)In situ monitoring system

4. Typical Process Cases

(1)diamond-Copper composite material

parameter

Stress30MPa

temperature850°C(Insulation)3min）

current3000APulse mode, duty cycle50%）

effect:

Thermal conductivity>600W/mK(approaching theoretical value)

Volume fraction of diamond70%Relative density at time>99%

(2)Nano zirconia ceramics

Special process:

Two stage sintering:
①1200°C/50MPa(Activation of grain boundaries)
②1350°C/10MPa(Inhibit grain growth)

Pulse current frequency:5kHz(Reduce residual pores)

Performance:

Average grain size<100nm

fracture toughness8MPa·m¹/²(Traditional sintering)1.5(Multiple times)

5. Safety and energy-saving design

6. Device scalability

Modular stress framework: can be upgraded by stacking modules to100T

Multiple field coupling options:

Optional magnetic field module（1TPermanent magnet, used for orientation sintering)

Optional mechanical vibration table（50-200HzPromote particle rearrangement)

7. Technical and Economic Analysis

Conclusion

35T SPSThe sintering furnace achieves rapid densification of high-performance materials through precise control of multiple physical fields and intelligent process control. Its core advantages lie in:
① Nanostructure retention ability (grain growth inhibition);
② Heterogeneous material interface optimization (such as metal)-Ceramic composite materials);
③ Process repeatability（CV＜3%）.

Future development direction:

Ultra high temperature version (>2500°CUsing graphene heating element

Industrial mass production type (multi chamber parallel connection, increased production capacity)5(Multiple times)

Green manufacturing (pulse current energy utilization efficiency improved to>80%）