Silicon ingot, crucible for silicon ingot production, method for manufacturing crucible for silicon ingot production, and method for producing silicon ingot

A crucible for silicon ingot production that is used in producing a silicon ingot, comprising:

• a mold,
• slurry layers consisting of fine silica powder having an average particle diameter of 1 μm or more and 200 μm or less and colloidal silica, and
• stucco layers consisting of coarse silica powder having an average particle diameter of 100 μm or more and 1,000 μm or less,
• wherein the slurry layers and the stucco layers are alternately laminated in a thickness direction on an inner surface of the mold, and a total number of laminated layers of the slurry layers and the stucco layers is 6 or more.

A method for manufacturing a crucible for silicon ingot production that is used in producing a silicon ingot, the method comprising:

• slurry layer forming steps of applying or spraying a slurry containing fine silica powder having an average particle diameter of 1 μm or more and 200 μm or less and colloidal silica onto an inner surface of a mold to form slurry layers;
• stucco layer forming steps of scattering coarse silica powder having an average particle size of 100 μm or more and 1,000 μm or less onto the inner surface of the mold to form stucco layers;
• and
• a baking step of baking a laminated layers of the slurry layers and the stucco layers,
• wherein the slurry layer forming steps and the stucco layer forming steps are each carried out three times or more and alternately repeated,
• a total number of the laminated layers of the slurry layers and the stucco layers is set to 6 or more, and
• the baking step is subsequently carried out.