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Lightweight high-strength porous ceramic with electromagnetic shielding effectiveness and preparation method and application thereof
The invention discloses a lightweight high-strength porous ceramic with electromagnetic shielding effectiveness and a preparation method and application thereof, and belongs to the field of preparation of composite materials. According to the method, silicon carbide nanowire aerogel with a three-dimensional network structure is used as a matrix, methyl trichlorosilane and methane are used as precursors, and silicon carbide layers and carbon layers are sequentially and alternately deposited on the surfaces of nanowires through a chemical vapor infiltration method. According to the porous ceramic prepared through the method, the mechanical property of the porous ceramic can be greatly improved while the three-dimensional network porous structure is guaranteed, when the low relative density is 3.13%-31.25%, the compression strength is 1.1-45.9 MPa, the specific compression strength is 1.0-4.6 * 10 < 4 > N * m/kg, pseudo-plasticity is shown, sudden brittle failure is avoided when the porous ceramic bears load damage, and the reliability is greatly improved; meanwhile, the electromagnetic shielding effectiveness of the porous ceramic with the layer replacement structure in the wave band of 8.2-12.4 GHz is 42.8 dB, and excellent electromagnetic shielding performance is shown; the material is expected to be used as an electromagnetic shielding material in extreme environments.
本发明公开了一种具有电磁屏蔽效能的轻质高强多孔陶瓷及其制备方法和应用，属于复合材料的制备领域。该方法以具有三维网络结构的碳化硅纳米线气凝胶为基体，以甲基三氯硅烷和甲烷为前驱体，通过化学气相渗透法在纳米线表面依次交替沉积碳化硅层和碳层。经该方法制得的多孔陶瓷在保证三维网络多孔结构的同时，可实现多孔陶瓷力学性能的大幅提高，在低相对密度3.13％～31.25％时，压缩强度为1.1～45.9MPa，比压缩强度为1.0～4.6*104N·m/kg，且表现出“伪塑性”，承受载荷破坏时不会突然脆断，大大提高了可靠性；同时，这种层替结构的多孔陶瓷在8.2～12.4GHz波段的电磁屏蔽效能为42.8dB，展现出优异的电磁屏蔽性能；有望应用于极端环境做电磁屏蔽材料。
Lightweight high-strength porous ceramic with electromagnetic shielding effectiveness and preparation method and application thereof
The invention discloses a lightweight high-strength porous ceramic with electromagnetic shielding effectiveness and a preparation method and application thereof, and belongs to the field of preparation of composite materials. According to the method, silicon carbide nanowire aerogel with a three-dimensional network structure is used as a matrix, methyl trichlorosilane and methane are used as precursors, and silicon carbide layers and carbon layers are sequentially and alternately deposited on the surfaces of nanowires through a chemical vapor infiltration method. According to the porous ceramic prepared through the method, the mechanical property of the porous ceramic can be greatly improved while the three-dimensional network porous structure is guaranteed, when the low relative density is 3.13%-31.25%, the compression strength is 1.1-45.9 MPa, the specific compression strength is 1.0-4.6 * 10 < 4 > N * m/kg, pseudo-plasticity is shown, sudden brittle failure is avoided when the porous ceramic bears load damage, and the reliability is greatly improved; meanwhile, the electromagnetic shielding effectiveness of the porous ceramic with the layer replacement structure in the wave band of 8.2-12.4 GHz is 42.8 dB, and excellent electromagnetic shielding performance is shown; the material is expected to be used as an electromagnetic shielding material in extreme environments.
本发明公开了一种具有电磁屏蔽效能的轻质高强多孔陶瓷及其制备方法和应用，属于复合材料的制备领域。该方法以具有三维网络结构的碳化硅纳米线气凝胶为基体，以甲基三氯硅烷和甲烷为前驱体，通过化学气相渗透法在纳米线表面依次交替沉积碳化硅层和碳层。经该方法制得的多孔陶瓷在保证三维网络多孔结构的同时，可实现多孔陶瓷力学性能的大幅提高，在低相对密度3.13％～31.25％时，压缩强度为1.1～45.9MPa，比压缩强度为1.0～4.6*104N·m/kg，且表现出“伪塑性”，承受载荷破坏时不会突然脆断，大大提高了可靠性；同时，这种层替结构的多孔陶瓷在8.2～12.4GHz波段的电磁屏蔽效能为42.8dB，展现出优异的电磁屏蔽性能；有望应用于极端环境做电磁屏蔽材料。
Lightweight high-strength porous ceramic with electromagnetic shielding effectiveness and preparation method and application thereof
一种具有电磁屏蔽效能的轻质高强多孔陶瓷及其制备方法和应用
WANG HONGJIE (author) / ZHANG JIJUN (author) / ZHUANG LEI (author) / LU DE (author) / SU LEI (author) / NIU MIN (author) / PENG KANG (author)
2023-07-18
Patent
Electronic Resource
Chinese
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