Abstract: A graphite nozzle is combined by stacking a plurality of graphite tubes together, applied in polysilicon refining cyclic vacuum equipment or used as a lining of fireproof or refractory material, where each graphite tube includes a upper coupling portion and a lower coupling portion, the upper coupling portion is positioned on a top face of a upper side of the graphite tube; and the lower coupling portion is positioned on a bottom face of a lower side of the graphite tube, and corresponds to the upper coupling portion, allowing the upper coupling portion of each graphite tube to be propped against the lower coupling portion of another graphite tube; the graphite tubes are fused and coupled together by means of a sintering treatment after the graphite tubes are stacked together.

Abstract: A combined graphite tube is combined by stacking a plurality of graphite short-tubes together, where each graphite short-tube includes a upper coupling portion and a lower coupling portion, the upper coupling portion is positioned on a top face of a upper side of the graphite short-tube; and the lower coupling portion is positioned on a bottom face of a lower side of the graphite short-tube, and corresponds to the upper coupling portion, allowing the upper coupling portion of each graphite short-tube to be propped against the lower coupling portion of another graphite short-tube; the graphite short-tubes are fused and coupled together by means of a sintering treatment after the graphite short-tubes are stacked together. Whereby, the combined graphite tube of the present invention may be utilized in silicon smelting, and may be coupled to an enough length of graphite tube depending on requirements or derive a graphite crucible, capable of improving silicon smelting efficiency.