A Rotary CVD Furnace with an Automatic Feeder and Receiver is a specialized system designed for the continuous, uniform coating of powders (such as battery cathode/anode active materials). In a standard tube furnace, powders often agglomerate, leaving the center of the pile uncoated. This system uses a rotating tube to "tumble" the particles, ensuring every grain is exposed to the precursor gases.

The integration of an automatic feeder and receiver transforms a batch process into a semi-continuous or fully continuous production line. (1) Automatic Feeder (Inlet): Typically a Vibratory or Screw (Volumetric) Feeder. It meters the raw powder into the rotating tube at a precise rate (0–100 mL/min), preventing clumping at the entrance. (2) Rotating Reaction Tube: A quartz or stainless steel tube with internal "flaps" or "baffles." As the tube rotates (0–20 RPM), the flaps lift and drop the powder through the precursor gas stream. (3) Tilt Mechanism: The entire furnace can be tilted (0° to 25°). Gravity, combined with rotation, moves the powder from the feeder end to the receiver end. (4) Automatic Receiver (Outlet): A sealed, vacuum-tight container that collects the coated powder. In 2026 models, these are often Atmosphere-Protected, allowing you to collect air-sensitive materials (like sodium-ion precursors) without oxidation.

References:

V. D. Santo, et al., Tailored supported metal nanoparticles by CVD: an easy and efficient scale-up by a rotary bed OMCVD device, J. Mater. Chem., 2009,19, 9030-9037.

S. Tu, et al., Parametric investigation of in-situ synthesis of carbon nanotubes on Al2O3 powder by the rotary chemical vapor deposition method, Ceramics International, 2022, 48, 28258-28267