Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of silicon nitride powder suitable for tape casting and injection molding
The invention discloses a preparation method of silicon nitride powder suitable for tape casting and injection molding, belonging to the technical field of ceramic powder preparation. The preparationmethod comprises the following steps: (1) weighing a certain amount of silicon nitride powder with an irregular shape; (2) feeding the silicon nitride powder into a grinding feed port, and enabling the powder to undergo collision, rubbing and shearing in a grinding cavity through high-speed jet airflow from a nozzle so as to remove edges and corners; and (3) fully grinding the silicon nitride powder by adjusting a feeding speed, grinding gas pressure and grinding frequency, and collecting a formed material through a collector and a dust remover. According to the invention, the high-energy airflow is adopted to shape and modify silicon nitride powder in irregular shapes, so the sphericity degree , flowability, loose packing density, tap density and specific surface area of powder particlesare improved; the volume fraction of silicon nitride in tape casting slurry and an injection molding feed is increased under the condition of the same rheological behavior, so the problems of low initial density, high sintering shrinkage rate, easiness in deformation and the like of a green body caused by low content of solid powder particles can be solved.
一种适合流延和注射成形的氮化硅粉体制备方法，属于陶瓷粉体制备技术领域。包括以下步骤：(1)称取一定量的氮化硅粉体，其形貌为不规则形状形貌；(2)将氮化硅粉体送入研磨进料口，通过喷嘴高速喷射气流，使粉体在研磨腔内碰撞、磨擦、剪切去除棱角；(3)通过调节进料速度、研磨气体压力和研磨次数，使氮化硅粉体得到充分研磨，经过收集器和除尘器进行收集物料。本发明采用高能气流对不规则形状氮化硅粉体进行整形和改性处理，提高粉体颗粒的球形度和流动性，以及粉体的松装密度、振实密度和比表面积，在同等流变行为下增加了流延成形浆料和注射成形喂料中氮化硅的体积分数，可解决因固体粉末颗粒含量低造成坯体初始密度低、烧结收缩率大、容易变形等问题。
Preparation method of silicon nitride powder suitable for tape casting and injection molding
The invention discloses a preparation method of silicon nitride powder suitable for tape casting and injection molding, belonging to the technical field of ceramic powder preparation. The preparationmethod comprises the following steps: (1) weighing a certain amount of silicon nitride powder with an irregular shape; (2) feeding the silicon nitride powder into a grinding feed port, and enabling the powder to undergo collision, rubbing and shearing in a grinding cavity through high-speed jet airflow from a nozzle so as to remove edges and corners; and (3) fully grinding the silicon nitride powder by adjusting a feeding speed, grinding gas pressure and grinding frequency, and collecting a formed material through a collector and a dust remover. According to the invention, the high-energy airflow is adopted to shape and modify silicon nitride powder in irregular shapes, so the sphericity degree , flowability, loose packing density, tap density and specific surface area of powder particlesare improved; the volume fraction of silicon nitride in tape casting slurry and an injection molding feed is increased under the condition of the same rheological behavior, so the problems of low initial density, high sintering shrinkage rate, easiness in deformation and the like of a green body caused by low content of solid powder particles can be solved.
一种适合流延和注射成形的氮化硅粉体制备方法，属于陶瓷粉体制备技术领域。包括以下步骤：(1)称取一定量的氮化硅粉体，其形貌为不规则形状形貌；(2)将氮化硅粉体送入研磨进料口，通过喷嘴高速喷射气流，使粉体在研磨腔内碰撞、磨擦、剪切去除棱角；(3)通过调节进料速度、研磨气体压力和研磨次数，使氮化硅粉体得到充分研磨，经过收集器和除尘器进行收集物料。本发明采用高能气流对不规则形状氮化硅粉体进行整形和改性处理，提高粉体颗粒的球形度和流动性，以及粉体的松装密度、振实密度和比表面积，在同等流变行为下增加了流延成形浆料和注射成形喂料中氮化硅的体积分数，可解决因固体粉末颗粒含量低造成坯体初始密度低、烧结收缩率大、容易变形等问题。
Preparation method of silicon nitride powder suitable for tape casting and injection molding
一种适合流延和注射成形的氮化硅粉体制备方法
WANG YUELONG (Autor:in) / TIAN JIANJUN (Autor:in) / QIN MINGLI (Autor:in) / WU HAOYANG (Autor:in) / JIA BAORUI (Autor:in) / ZHANG YIMING (Autor:in) / ZHANG LIN (Autor:in) / QU XUANHUI (Autor:in)
12.05.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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