Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of gamma-AlON powder
The invention provides a method for preparing gamma-AlON powder, which comprises the following steps: ball-milling Al2O3 powder, carbon powder, a dispersing agent, a binder and water, uniformly mixing, adding a surfactant, and stirring or ball-milling; injecting into a mold for molding, and freeze-drying to obtain a foam precursor; reacting the foam precursor in a flowing nitrogen atmosphere; and calcining the powder obtained by the reaction to remove carbon, thereby obtaining the gamma-AlON powder. The high-purity single-phase gamma-AlON powder is prepared by a method of combining mechanical stirring foaming and freeze drying, and a communicated pore structure contained in the prepared foam precursor promotes diffusion of nitrogen molecules in the raw material, so that the reaction uniformity of the upper and lower surfaces of the raw material is improved, the reaction rate is increased, and the preparation process is simplified. The raw material powder is solidified through freeze-drying forming, so that the problems of suspension loss and the like of the raw material powder in the vacuumizing and flowing nitrogen introduction process are solved.
本发明提供一种制备γ‑AlON粉体的方法，该方法包括以下步骤：将Al2O3粉、碳粉、分散剂、粘结剂和水，球磨混合均匀后加表面活性剂进行搅拌或球磨；注入模具成型、冷冻干燥，得到泡沫前驱体；将泡沫前驱体在流动氮气气氛下反应；将反应所得粉体煅烧除碳，即得到γ‑AlON粉体。本发明以机械搅拌发泡和冷冻干燥相结合的方法来制备高纯单相γ‑AlON粉体，制备的泡沫前驱体中包含的连通的孔隙结构促进了氮气分子在原料内部的扩散，有利于提升原料上下表面反应的均匀性、加快反应速率，冷冻干燥成型使原料粉体固化，从而避免在抽真空和通入流动氮气的过程中原料粉体的悬浮损耗等问题。
Preparation method of gamma-AlON powder
The invention provides a method for preparing gamma-AlON powder, which comprises the following steps: ball-milling Al2O3 powder, carbon powder, a dispersing agent, a binder and water, uniformly mixing, adding a surfactant, and stirring or ball-milling; injecting into a mold for molding, and freeze-drying to obtain a foam precursor; reacting the foam precursor in a flowing nitrogen atmosphere; and calcining the powder obtained by the reaction to remove carbon, thereby obtaining the gamma-AlON powder. The high-purity single-phase gamma-AlON powder is prepared by a method of combining mechanical stirring foaming and freeze drying, and a communicated pore structure contained in the prepared foam precursor promotes diffusion of nitrogen molecules in the raw material, so that the reaction uniformity of the upper and lower surfaces of the raw material is improved, the reaction rate is increased, and the preparation process is simplified. The raw material powder is solidified through freeze-drying forming, so that the problems of suspension loss and the like of the raw material powder in the vacuumizing and flowing nitrogen introduction process are solved.
本发明提供一种制备γ‑AlON粉体的方法，该方法包括以下步骤：将Al2O3粉、碳粉、分散剂、粘结剂和水，球磨混合均匀后加表面活性剂进行搅拌或球磨；注入模具成型、冷冻干燥，得到泡沫前驱体；将泡沫前驱体在流动氮气气氛下反应；将反应所得粉体煅烧除碳，即得到γ‑AlON粉体。本发明以机械搅拌发泡和冷冻干燥相结合的方法来制备高纯单相γ‑AlON粉体，制备的泡沫前驱体中包含的连通的孔隙结构促进了氮气分子在原料内部的扩散，有利于提升原料上下表面反应的均匀性、加快反应速率，冷冻干燥成型使原料粉体固化，从而避免在抽真空和通入流动氮气的过程中原料粉体的悬浮损耗等问题。
Preparation method of gamma-AlON powder
γ-AlON粉体的制备方法
WANG JUN (Autor:in) / HARA YASUHIRA (Autor:in) / ZHANG JING (Autor:in) / SU XUEJIAN (Autor:in)
27.09.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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