Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation process of high-purity superfine silicon nitride powder
The invention discloses a preparation process of high-purity superfine silicon nitride powder, which comprises the following steps: S1, preparation of a silicon block blank: S11, mixing silicon powder with a diluent to obtain a powder mixture; s12, mixing the powder mixture with a binder, and carrying out spheroidizing treatment to obtain silicon powder mixed particles; s13, carrying out compression molding on the silicon powder mixed particles to obtain a silicon block green body; s2, preparation of a silicon nitride block: S21, carrying out first-stage sintering and degreasing on the silicon block blank under a vacuumizing condition, then carrying out second-stage sintering and nitriding, introducing a nitrogen-hydrogen-argon mixed gas which comprises nitrogen, hydrogen and argon, and discharging the gas to obtain the silicon nitride block; and S3, preparation of silicon nitride powder: S31, crushing the silicon nitride blocks to obtain the silicon nitride powder. The porosity among particles in the silicon block is increased through spheroidizing treatment, and heat accumulation is avoided; and through a reasonable sintering process, silicon overflow is avoided, conversion from an alpha phase to a beta phase is avoided, and sufficient nitridation of a silicon block is ensured.
本发明公开了高纯超细氮化硅粉体的制备工艺，包括：以下步骤：S1，硅块坯体的制备：包括：S11，将硅粉先和稀释剂混合，得到粉体混合物；S12，将粉体混合物与粘结剂混合后，进行球形化处理，得到硅粉混合粒；S13，将硅粉混合粒压制成型，得到硅块坯体；S2，氮化硅块的制备：包括：S21，将硅块坯体在抽真空条件下第一段烧结脱脂，再进行第二段烧结氮化，通入氮氢氩混合气，氮氢氩混合气包括氮气、氢气和氩气，排空气体后得到氮化硅块；S3，氮化硅粉体的制备：包括：S31，将氮化硅块破碎，得到氮化硅粉体。通过球形化处理增加硅块内部颗粒与颗粒之间的孔隙率，避免聚热；通过合理烧结工艺避免出现硅溢，避免α相向β相转化，保证硅块能够充分的氮化。
Preparation process of high-purity superfine silicon nitride powder
The invention discloses a preparation process of high-purity superfine silicon nitride powder, which comprises the following steps: S1, preparation of a silicon block blank: S11, mixing silicon powder with a diluent to obtain a powder mixture; s12, mixing the powder mixture with a binder, and carrying out spheroidizing treatment to obtain silicon powder mixed particles; s13, carrying out compression molding on the silicon powder mixed particles to obtain a silicon block green body; s2, preparation of a silicon nitride block: S21, carrying out first-stage sintering and degreasing on the silicon block blank under a vacuumizing condition, then carrying out second-stage sintering and nitriding, introducing a nitrogen-hydrogen-argon mixed gas which comprises nitrogen, hydrogen and argon, and discharging the gas to obtain the silicon nitride block; and S3, preparation of silicon nitride powder: S31, crushing the silicon nitride blocks to obtain the silicon nitride powder. The porosity among particles in the silicon block is increased through spheroidizing treatment, and heat accumulation is avoided; and through a reasonable sintering process, silicon overflow is avoided, conversion from an alpha phase to a beta phase is avoided, and sufficient nitridation of a silicon block is ensured.
本发明公开了高纯超细氮化硅粉体的制备工艺，包括：以下步骤：S1，硅块坯体的制备：包括：S11，将硅粉先和稀释剂混合，得到粉体混合物；S12，将粉体混合物与粘结剂混合后，进行球形化处理，得到硅粉混合粒；S13，将硅粉混合粒压制成型，得到硅块坯体；S2，氮化硅块的制备：包括：S21，将硅块坯体在抽真空条件下第一段烧结脱脂，再进行第二段烧结氮化，通入氮氢氩混合气，氮氢氩混合气包括氮气、氢气和氩气，排空气体后得到氮化硅块；S3，氮化硅粉体的制备：包括：S31，将氮化硅块破碎，得到氮化硅粉体。通过球形化处理增加硅块内部颗粒与颗粒之间的孔隙率，避免聚热；通过合理烧结工艺避免出现硅溢，避免α相向β相转化，保证硅块能够充分的氮化。
Preparation process of high-purity superfine silicon nitride powder
高纯超细氮化硅粉体的制备工艺
WANG RUIQIANG (Autor:in) / SHEN CHANGSHENG (Autor:in) / LI BIN (Autor:in) / XING PEIJI (Autor:in) / WANG TENGFEI (Autor:in) / ZHANG JI (Autor:in) / ZHAO HONGCHAO (Autor:in) / QI XINSHUAN (Autor:in) / ZHANG WEIRU (Autor:in) / CHEN BO (Autor:in)
28.05.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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