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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of large-size silicon nitride crucible
The invention discloses a preparation method of a large-size silicon nitride crucible. According to the method, (1) silicon nitride powder, a dispersing agent, sintering aids, a binding agent and a solvent are well mixed, such that a slurry is obtained; (2) the slurry is added into a mold cavity of a gypsum mold under stirring; the mold is placed in an environment with constant temperature and constant humidity, such that the mold can absorb and discharge water; and a molded cured blank is obtained; (3) a mold core and side molds of the mold are removed, and the molded cured blank is placed in a curing furnace, such that the product is cured and dried, and a green body is obtained; (4) the green body is placed in a gas pressure sintering furnace, and is subjected to segmented sintering; when sintering is finished, the temperature is reduced, the pressure is released and the product is fetched from the furnace, such that the silicon nitride crucible is obtained. According to the invention, silicon dioxide and magnesium silicon nitride are adopted as sintering aids, such that the prepared silicon nitride crucible has low oxygen impurity and metal impurity contents, large bulk density, high high-temperature strength, and large size. The crucible can be widely applied in various non-ferrous metal smelting and silicon crystal ingot casting. The preparation method is simple to operate, and is easy to popularize.
Preparation method of large-size silicon nitride crucible
The invention discloses a preparation method of a large-size silicon nitride crucible. According to the method, (1) silicon nitride powder, a dispersing agent, sintering aids, a binding agent and a solvent are well mixed, such that a slurry is obtained; (2) the slurry is added into a mold cavity of a gypsum mold under stirring; the mold is placed in an environment with constant temperature and constant humidity, such that the mold can absorb and discharge water; and a molded cured blank is obtained; (3) a mold core and side molds of the mold are removed, and the molded cured blank is placed in a curing furnace, such that the product is cured and dried, and a green body is obtained; (4) the green body is placed in a gas pressure sintering furnace, and is subjected to segmented sintering; when sintering is finished, the temperature is reduced, the pressure is released and the product is fetched from the furnace, such that the silicon nitride crucible is obtained. According to the invention, silicon dioxide and magnesium silicon nitride are adopted as sintering aids, such that the prepared silicon nitride crucible has low oxygen impurity and metal impurity contents, large bulk density, high high-temperature strength, and large size. The crucible can be widely applied in various non-ferrous metal smelting and silicon crystal ingot casting. The preparation method is simple to operate, and is easy to popularize.
Preparation method of large-size silicon nitride crucible
GUO DAWEI (Autor:in) / LU NING (Autor:in) / SONG LICEN (Autor:in) / LYU DONG (Autor:in)
28.10.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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