Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Sintering method of completely-densified high-proportion covalent bond ceramic
The invention discloses a sintering method of completely-densified high-proportion covalent bond ceramic, which specifically comprises the following steps: putting ceramic raw material powder into a graphite mold for cold press molding, putting the cold press molded ceramic raw material powder and the graphite mold into a sintering furnace, and applying alternating pressure with variable amplitude and frequency at a certain sintering temperature for alternating pressure sintering to obtain the completely-densified high-proportion covalent bond ceramic. A covalent bond proportion gt is formed after cooling; and 85% of covalent bond ceramic. By means of alternating pressure sintering, the high-proportion covalent bond ceramic can be completely densified at the temperature 200-400 DEG C lower than that of traditional hot pressing sintering, the small grain size and the good structure uniformity are maintained, the high hardness and the high fracture toughness are achieved at the same time, in addition, equipment needed by the method is low in cost, and the method is suitable for industrial production. The method can be used for preparing large-size samples, industrial application is easy to realize, and the bottleneck that the mechanical property is difficult to meet the industrial application requirement due to the fact that existing high-proportion covalent bond ceramics are difficult to densify completely is broken through.
本发明公开了一种完全致密化高占比共价键陶瓷的烧结方法，具体为：将陶瓷原料粉体装于石墨模具内进行冷压成型，冷压成型后连同石墨模具置于烧结炉中，在一定烧结温度下施加可变振幅和频率的交变压力进行交变压力烧结，冷却后形成共价键占比>85％的共价键陶瓷。本发明的交变压力烧结能够将高占比共价键陶瓷在低于传统热压烧结200‑400℃的温度下完全致密化，并维持较小的晶粒尺寸和较好的组织均匀性，使其同时具有高的硬度和高的断裂韧性，另外该方法所需设备成本低，并可用于制备大尺寸样品，容易实现工业应用，突破目前高占比共价键陶瓷因很难完全致密化从而导致力学性能难以满足工业应用需求的瓶颈。
Sintering method of completely-densified high-proportion covalent bond ceramic
The invention discloses a sintering method of completely-densified high-proportion covalent bond ceramic, which specifically comprises the following steps: putting ceramic raw material powder into a graphite mold for cold press molding, putting the cold press molded ceramic raw material powder and the graphite mold into a sintering furnace, and applying alternating pressure with variable amplitude and frequency at a certain sintering temperature for alternating pressure sintering to obtain the completely-densified high-proportion covalent bond ceramic. A covalent bond proportion gt is formed after cooling; and 85% of covalent bond ceramic. By means of alternating pressure sintering, the high-proportion covalent bond ceramic can be completely densified at the temperature 200-400 DEG C lower than that of traditional hot pressing sintering, the small grain size and the good structure uniformity are maintained, the high hardness and the high fracture toughness are achieved at the same time, in addition, equipment needed by the method is low in cost, and the method is suitable for industrial production. The method can be used for preparing large-size samples, industrial application is easy to realize, and the bottleneck that the mechanical property is difficult to meet the industrial application requirement due to the fact that existing high-proportion covalent bond ceramics are difficult to densify completely is broken through.
本发明公开了一种完全致密化高占比共价键陶瓷的烧结方法，具体为：将陶瓷原料粉体装于石墨模具内进行冷压成型，冷压成型后连同石墨模具置于烧结炉中，在一定烧结温度下施加可变振幅和频率的交变压力进行交变压力烧结，冷却后形成共价键占比>85％的共价键陶瓷。本发明的交变压力烧结能够将高占比共价键陶瓷在低于传统热压烧结200‑400℃的温度下完全致密化，并维持较小的晶粒尺寸和较好的组织均匀性，使其同时具有高的硬度和高的断裂韧性，另外该方法所需设备成本低，并可用于制备大尺寸样品，容易实现工业应用，突破目前高占比共价键陶瓷因很难完全致密化从而导致力学性能难以满足工业应用需求的瓶颈。
Sintering method of completely-densified high-proportion covalent bond ceramic
一种完全致密化高占比共价键陶瓷的烧结方法
ZHAO KE (Autor:in) / LIU JINLING (Autor:in) / LIU DIANGUANG (Autor:in) / CHEN LITAO (Autor:in)
19.04.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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