[en] TRISO-coated fuel particles for high-temperature gas-cooled reactors consist of UO₂ microspheres coated with layers of porous pyrolytic carbon (porous PyC), inner dense PyC (IPyC), silicon carbide (SiC), and outer dense PyC (OPyC). The porous PyC coating layer, the so-called buffer layer, attenuates fission recoils and provides a void volume for gaseous fission products and carbon monoxide. The IPyC layer acts as containment for gaseous products. The OPyC layer protects the SiC coating layer by inducing a compressive stress along with the IPyC layer and provides chemical compatibility with the graphite matrix in a fuel compact. Among the TRISO coating layers the SiC layer is particularly important because it acts as a diffusion barrier to gaseous and metallic fission products and as a miniature pressure vessel for the particle. In order to insure the integrity of the SiC layer after fabrication and in use, the microstructure, mechanical properties, and chemical composition of the SiC layer should be controlled properly. For a uniform coating of the microspherical particles, the TRISO coating is performed using a fluidized-bed chemical vapor deposition (FBCVD) method. In the method, the process conditions such as the gas flow rate, concentration of the coating gas, coating temperature, etc., largely affect the characteristics of the coating layer. Among the deposition parameters the gas flow rate mainly determines the fluidization behavior of microspherical particles. In this study, we investigated the effect of the gas flow rate on the microstructure and properties of the SiC layer while fixing the other deposition parameters