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Silicon nitride-based conductive ceramic added with conductive particles and conductive fibers and preparation method of silicon nitride-based conductive ceramic
The invention belongs to the technical field of conductive ceramics, and particularly relates to a silicon nitride-based conductive ceramic and a preparation method thereof. The silicon nitride-based conductive ceramic provided by the invention comprises a silicon nitride substrate and a conductive phase dispersed in the silicon nitride substrate, the silicon nitride substrate is composed of a silicon nitride crystal phase and a sintering aid phase; the conductive phase comprises conductive ceramic particles and carbon fibers, and the conductive ceramic particles and the carbon fibers are alternately connected together and distributed in a topological network structure. On the basis of adding the conductive ceramic particles as a conductive phase, the carbon fibers are added as a second conductive phase to form a special topological network structure, so that the conductivity of the ceramic material is ensured, the consumption of the ceramic conductive phase powder is reduced, the occurrence of melting and agglomeration in the sintering process due to excessive ceramic conductive phases is avoided, and the service life of the ceramic material is prolonged. The formation of a conductive network is facilitated, the resistivity of the silicon nitride-based ceramic is greatly reduced, and the fracture toughness of the ceramic is improved to a certain extent by virtue of the long-rod-shaped carbon fibers.
本发明属于导电陶瓷技术领域，具体涉及一种氮化硅基导电陶瓷及其制备方法。本发明提供的氮化硅基导电陶瓷，包括氮化硅基体和分散于氮化硅基体中的导电相；所述氮化硅基体由氮化硅结晶相和烧结助剂相组成；所述导电相包括导电陶瓷颗粒和碳纤维，所述导电陶瓷颗粒和碳纤维交替连接在一起呈拓扑网络结构分布。本发明在添加导电陶瓷颗粒作为导电相的基础上，加入碳纤维作为第二种导电相，形成特殊的拓扑网络结构，保证到陶瓷材料导电性的同时，降低了陶瓷导电相粉体的用量，避免因陶瓷导电相过多在烧结过程中熔融团聚的发生，利于导电网络的形成大幅度降低氮化硅基陶瓷的电阻率，且长棒状的碳纤维对陶瓷的断裂韧性有着一定的提升。
Silicon nitride-based conductive ceramic added with conductive particles and conductive fibers and preparation method of silicon nitride-based conductive ceramic
The invention belongs to the technical field of conductive ceramics, and particularly relates to a silicon nitride-based conductive ceramic and a preparation method thereof. The silicon nitride-based conductive ceramic provided by the invention comprises a silicon nitride substrate and a conductive phase dispersed in the silicon nitride substrate, the silicon nitride substrate is composed of a silicon nitride crystal phase and a sintering aid phase; the conductive phase comprises conductive ceramic particles and carbon fibers, and the conductive ceramic particles and the carbon fibers are alternately connected together and distributed in a topological network structure. On the basis of adding the conductive ceramic particles as a conductive phase, the carbon fibers are added as a second conductive phase to form a special topological network structure, so that the conductivity of the ceramic material is ensured, the consumption of the ceramic conductive phase powder is reduced, the occurrence of melting and agglomeration in the sintering process due to excessive ceramic conductive phases is avoided, and the service life of the ceramic material is prolonged. The formation of a conductive network is facilitated, the resistivity of the silicon nitride-based ceramic is greatly reduced, and the fracture toughness of the ceramic is improved to a certain extent by virtue of the long-rod-shaped carbon fibers.
本发明属于导电陶瓷技术领域，具体涉及一种氮化硅基导电陶瓷及其制备方法。本发明提供的氮化硅基导电陶瓷，包括氮化硅基体和分散于氮化硅基体中的导电相；所述氮化硅基体由氮化硅结晶相和烧结助剂相组成；所述导电相包括导电陶瓷颗粒和碳纤维，所述导电陶瓷颗粒和碳纤维交替连接在一起呈拓扑网络结构分布。本发明在添加导电陶瓷颗粒作为导电相的基础上，加入碳纤维作为第二种导电相，形成特殊的拓扑网络结构，保证到陶瓷材料导电性的同时，降低了陶瓷导电相粉体的用量，避免因陶瓷导电相过多在烧结过程中熔融团聚的发生，利于导电网络的形成大幅度降低氮化硅基陶瓷的电阻率，且长棒状的碳纤维对陶瓷的断裂韧性有着一定的提升。
Silicon nitride-based conductive ceramic added with conductive particles and conductive fibers and preparation method of silicon nitride-based conductive ceramic
一种添加导电颗粒和导电纤维的氮化硅基导电陶瓷及其制备方法
QIAO ZHUHUI (author) / WANG LUJIE (author) / HUANG HAO (author) / LI TONGYANG (author) / YU YUAN (author) / TANG HUAGUO (author)
2024-04-26
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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