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A platform for research: civil engineering, architecture and urbanism
Novel porous ceramic wave-absorbing material as well as preparation method and application thereof
The invention provides a novel porous ceramic wave-absorbing material as well as a preparation method and application thereof, and belongs to the technical field of ceramics. The preparation method comprises the following steps: preparing ceramic raw materials into ceramic slurry with different solid phase contents, pouring the ceramic slurry into a mold in batches, freezing, demolding, transferring a demolded sample into a freeze dryer to remove moisture, sintering a molded ceramic blank at high temperature in a protective atmosphere, and controlling the growth of solvent ice by adjusting solidification conditions and the ratio of the slurry to achieve the purpose of changing the pore form. And thus, the wave-absorbing capacity of the material is improved. The reflection loss of the porous ceramic material prepared by the method ranges from-10 dB to-50 dB, and when the thickness of the porous ceramic is 2-3 mm, the effective absorption bandwidth can cover the whole X wave band. The porous ceramic prepared by a freeze drying method has the advantages of relatively stable green body structure, low shrinkage rate after sintering of a green body, controllable pore structure, high product strength, strong thermal shock resistance, high-temperature stability, large specific surface area, high porosity and the like, and is a promising high-performance electromagnetic wave absorbing material.
本发明提供一种新型多孔陶瓷吸波材料及其制备方法与应用，属于陶瓷技术领域。将陶瓷原料配成不同固相含量的陶瓷浆料，分批倒入模具中冷冻后脱模，将脱模后的样品移入冷冻干燥机中脱去水分，成型后的陶瓷坯体在保护气氛下高温烧结，通过调节凝固条件和浆料的配比控制溶剂冰生长可达到改变孔形态的目的，进而提高材料的吸波能力。本发明的方法制备的多孔陶瓷材料的反射损耗在‑10～‑50dB之间，多孔陶瓷厚度为2～3mm时的有效吸收带宽可覆盖整个X波段。本发明通过冷冻干燥法制备的多孔陶瓷具有较稳定的坯体结构，坯体烧结后收缩率低，孔结构可控，制品强度高，耐热震性强、高温稳定性、比表面积大且气孔率高等优点，是一种很有前途的高性能电磁波吸收材料。
Novel porous ceramic wave-absorbing material as well as preparation method and application thereof
The invention provides a novel porous ceramic wave-absorbing material as well as a preparation method and application thereof, and belongs to the technical field of ceramics. The preparation method comprises the following steps: preparing ceramic raw materials into ceramic slurry with different solid phase contents, pouring the ceramic slurry into a mold in batches, freezing, demolding, transferring a demolded sample into a freeze dryer to remove moisture, sintering a molded ceramic blank at high temperature in a protective atmosphere, and controlling the growth of solvent ice by adjusting solidification conditions and the ratio of the slurry to achieve the purpose of changing the pore form. And thus, the wave-absorbing capacity of the material is improved. The reflection loss of the porous ceramic material prepared by the method ranges from-10 dB to-50 dB, and when the thickness of the porous ceramic is 2-3 mm, the effective absorption bandwidth can cover the whole X wave band. The porous ceramic prepared by a freeze drying method has the advantages of relatively stable green body structure, low shrinkage rate after sintering of a green body, controllable pore structure, high product strength, strong thermal shock resistance, high-temperature stability, large specific surface area, high porosity and the like, and is a promising high-performance electromagnetic wave absorbing material.
本发明提供一种新型多孔陶瓷吸波材料及其制备方法与应用，属于陶瓷技术领域。将陶瓷原料配成不同固相含量的陶瓷浆料，分批倒入模具中冷冻后脱模，将脱模后的样品移入冷冻干燥机中脱去水分，成型后的陶瓷坯体在保护气氛下高温烧结，通过调节凝固条件和浆料的配比控制溶剂冰生长可达到改变孔形态的目的，进而提高材料的吸波能力。本发明的方法制备的多孔陶瓷材料的反射损耗在‑10～‑50dB之间，多孔陶瓷厚度为2～3mm时的有效吸收带宽可覆盖整个X波段。本发明通过冷冻干燥法制备的多孔陶瓷具有较稳定的坯体结构，坯体烧结后收缩率低，孔结构可控，制品强度高，耐热震性强、高温稳定性、比表面积大且气孔率高等优点，是一种很有前途的高性能电磁波吸收材料。
Novel porous ceramic wave-absorbing material as well as preparation method and application thereof
一种新型多孔陶瓷吸波材料及其制备方法与应用
QING YUCHANG (author) / WEN JIAHAO (author) / LU HUITING (author) / WANG HANG (author) / LUO FA (author)
2023-05-30
Patent
Electronic Resource
Chinese
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