Thermal management and design optimization for ultrahigh-temperature-pressure experiments in multi-anvil presses

Area of Science:

• Geophysics
• Materials Science
• High-pressure physics

Background:

• Simultaneous ultrahigh pressure and temperature generation is crucial for studying planetary interiors and synthesizing novel materials.
• Severe thermal losses in sample-cell assemblies challenge achieving extreme temperatures, especially above 40 gigapascals (GPa).

Purpose of the Study:

• To investigate principles for enhancing the temperature generation capacity of ultrahigh-pressure (UHP) assemblies.
• To provide a framework for achieving extreme UHP conditions through integrated thermal management.

Main Methods:

• Employed a coupled thermal-electrical finite element model.
• Validated the model with experimental data from UHP experiments.
• Analyzed the impact of assembly components on heating efficiency and stability.

Main Results:

• The radial alumina insulation sleeve significantly improves heating efficiency.
• Enlarging the titanium carbide electrode diameter enhances interfacial stability.
• High-thermal-conductivity sintered diamond anvils act as a safety mechanism against melting via heat dissipation, allowing temperatures around 4000 K.

Conclusions:

• Optimized assembly design alleviates thermal bottlenecks, enabling higher temperatures at ultrahigh pressures.
• The study provides practical strategies for integrated thermal management in UHP apparatus.
• This research facilitates the study of extreme planetary interior conditions and the synthesis of advanced materials.