Graphite Heating Element Vacuum Furnace

The heyu graphite heating element vacuum furnace uses graphite rods or graphite strips as the resistance heating elements, radiating heat into a hot face lined with rigid graphite felt and carbon-fiber insulation. The all-graphite hot zone is the enabling choice for processes that must reach 2400°C, because molybdenum elements would soften and vaporize long before that range. Graphite heaters also offer fast ramp rates, high thermal conductivity, and good resistance to thermal shock, and they operate cleanly under high vacuum and in inert or reducing atmospheres. The furnace chamber reaches 2×10⁻⁴ Pa with a pressure rise rate of ≤0.67 Pa/h, and the optimized heater arrangement holds temperature uniformity at ±3 to ±7.5°C across the workload. Because the hot face is all-carbon, it is the standard configuration for sintering tungsten, molybdenum, tantalum, and ceramic-matrix composites.

We tailor the hot zone to your process: choose graphite elements for 2400°C service or switch to molybdenum elements when you need a carbon-free environment, and our 6-engineer R&D team lays out the heater geometry and felt stacking to match your workload shape. Custom sample development takes about 30 days, and we build to your technical drawings or prototypes. In practice, that graphite hot face ramps quickly to temperature and absorbs repeated power cycles without element cracking, while the felt stack keeps the water jacket cool enough to extend seal and pump life across years of 2400°C campaigns.