The invention mainly discloses an ultrahigh-purity
quartz ceramic crucible and a preparation method thereof. The ultrahigh-purity
quartz ceramic crucible is mainly applied to
polycrystalline silicon ingots in the solar
photovoltaic industry. The preparation method comprises the steps of treating solar-grade purity silica
powder (6N) with different grain sizes, and then, adding silica
sol, deionized water, additives and the like according to a certain ratio to prepare
slurry with good dispersibility, wherein the solar-grade purity silica
powder (6N) with different grain sizes is used as the main
raw material; after further treating a common
quartz crucible, placing the
slurry on the inner surface of the common
quartz crucible in a way of
coating, brushing and the like; and after
drying, oxidizing and
sintering in a
kiln with an oxidizing
atmosphere to obtain the ultrahigh-purity quartz
ceramic crucible. By using the preparation method, the ultrahigh-purity quartz ceramic crucible can be obtained, an ultrahigh-purity crucible is produced by breaking the
bottleneck of an ultrahigh-purity quartz
raw material, impurities are more effectively prevented from entering ingots, side red areas are thoroughly eliminated, bottom red areas are reduced, the conversion efficiency is increased, the cost is reduced while the stability is kept, the
porosity is lower, the
volume density is higher, the property is more stable, the service life is greatly prolonged, and the using cost is effectively reduced.