Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Silicon nitride ceramic prepared by using binder spray molding technology and method
The invention discloses a silicon nitride ceramic prepared by using a binder injection molding technology and a method, and relates to the technical field of silicon nitride ceramic material preparation. According to the method for preparing the silicon nitride ceramic provided by the invention, the raw material silicon nitride powder and the sintering aid are uniformly mixed and then are subjected to spray granulation again, and the obtained spherical powder can ensure that the spherical powder has good flowability and is suitable for a binder spray molding technology; furthermore, the particle size of the raw materials is preferably selected to be submicron order, so that the sintering activity of the powder is improved; the preparation method comprises the following steps: preparing a silicon nitride ceramic blank, spraying and printing by using a binder to obtain a green body, carrying out vacuum siliconizing treatment in combination with nitriding treatment to enable silicon and nitrogen to react to generate silicon nitride in situ so as to reduce internal gaps of the green body, carrying out high-temperature sintering to obtain the silicon nitride ceramic with relatively high density, and finally, carrying out hot isostatic pressing treatment to obtain the silicon nitride ceramic with relatively high density. And residual air holes in the silicon nitride ceramic are further discharged, so that the silicon nitride ceramic component with high density, good mechanical property, large size and complex structure is obtained.
本发明公开了一种利用粘结剂喷射成型技术制备的氮化硅陶瓷及方法，涉及氮化硅陶瓷材料制备技术领域。本发明提供的制备氮化硅陶瓷的方法，将原料氮化硅粉体和烧结助剂混匀后重新喷雾造粒，得到的球形粉体可以确保其具有良好的流动性，适合粘结剂喷射成型技术；进一步地，优选原料的粒径为亚微米级，以提高粉体的烧结活性；然后利用粘结剂喷射打印制得生坯，再经过真空渗硅处理，结合氮化处理，使得硅与氮气反应原位生成氮化硅，从而减少坯体的内部空隙，经过高温烧结后得到致密度较高的氮化硅陶瓷，最后，通过热等静压处理，进一步排出氮化硅陶瓷内部残留的气孔，从而获得高致密度、力学性能良好的大尺寸复杂结构的氮化硅陶瓷部件。
Silicon nitride ceramic prepared by using binder spray molding technology and method
The invention discloses a silicon nitride ceramic prepared by using a binder injection molding technology and a method, and relates to the technical field of silicon nitride ceramic material preparation. According to the method for preparing the silicon nitride ceramic provided by the invention, the raw material silicon nitride powder and the sintering aid are uniformly mixed and then are subjected to spray granulation again, and the obtained spherical powder can ensure that the spherical powder has good flowability and is suitable for a binder spray molding technology; furthermore, the particle size of the raw materials is preferably selected to be submicron order, so that the sintering activity of the powder is improved; the preparation method comprises the following steps: preparing a silicon nitride ceramic blank, spraying and printing by using a binder to obtain a green body, carrying out vacuum siliconizing treatment in combination with nitriding treatment to enable silicon and nitrogen to react to generate silicon nitride in situ so as to reduce internal gaps of the green body, carrying out high-temperature sintering to obtain the silicon nitride ceramic with relatively high density, and finally, carrying out hot isostatic pressing treatment to obtain the silicon nitride ceramic with relatively high density. And residual air holes in the silicon nitride ceramic are further discharged, so that the silicon nitride ceramic component with high density, good mechanical property, large size and complex structure is obtained.
本发明公开了一种利用粘结剂喷射成型技术制备的氮化硅陶瓷及方法，涉及氮化硅陶瓷材料制备技术领域。本发明提供的制备氮化硅陶瓷的方法，将原料氮化硅粉体和烧结助剂混匀后重新喷雾造粒，得到的球形粉体可以确保其具有良好的流动性，适合粘结剂喷射成型技术；进一步地，优选原料的粒径为亚微米级，以提高粉体的烧结活性；然后利用粘结剂喷射打印制得生坯，再经过真空渗硅处理，结合氮化处理，使得硅与氮气反应原位生成氮化硅，从而减少坯体的内部空隙，经过高温烧结后得到致密度较高的氮化硅陶瓷，最后，通过热等静压处理，进一步排出氮化硅陶瓷内部残留的气孔，从而获得高致密度、力学性能良好的大尺寸复杂结构的氮化硅陶瓷部件。
Silicon nitride ceramic prepared by using binder spray molding technology and method
一种利用粘结剂喷射成型技术制备的氮化硅陶瓷及方法
WU SHANGHUA (Autor:in) / LI YEHUA (Autor:in) / LONG GUOQIN (Autor:in)
29.08.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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