Crucible structure and method for forming isolating layer of crucible

A method for foiniing an isolating layer of a crucible, comprising:

• placing a round crucible sideways such that a bottom surface of an inside of the round crucible is perpendicular to a horizontal plane, and the inside of the round crucible has a wall surface and the bottom surface;
• and
• perfoiiiiing a plurality of spraying processes to form the isolating layer on the bottom surface and the wall surface, wherein each of the spraying processes comprises:
• (a) spraying a slurry on the bottom surface;
• (b) using an optical positioner to set a spraying range the same as one of a plurality of partial areas divided from the wall surface;
• (c) aligning one of the plurality of partial areas with the spraying range;
• (d) fixing the round crucible and spraying the slurry in the spraying range;
• (e) stopping the spraying;
• (f) rotating the round crucible to move another partial area to the spraying range;
• and
• (g) repeating steps (d) to (f) until the spraying of all of the partial areas is completed.