Numerical Simulation Study on Flow and Heat Transfer of the Tungsten Crucible CVD Reactor.

In order to investigate the optimization of the performance and structure of a tungsten crucible CVD reactor, the CFD simulation method was used in this paper to simulate the internal flow of the tungsten crucible CVD reactor. The velocity distribution and temperature distribution in the reactor were obtained. The simulation results show that the axial and radial heat convection will occur between the susceptor and the outer wall surface, but the axial heat convection is more intense. Moreover, it was found that the temperature distribution in the CVD reactor was more uniform and reasonable when the upper gas inlet was applied, which was beneficial to the reduction and deposition processes of tungsten. The molar ratio of H2 to WF6 has a great influence on the deposition rate of tungsten, and excess H2 is not conducive to the deposition of tungsten. Thermal radiation has a great influence on the temperature distribution of CVD reactors. It cannot be neglected.