Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention relates to a preparation technology of a wave-absorbing material applicable to an extreme environment, in particular to a light broadband porous silicon carbide high-temperature wave-absorbing material prepared by an in-situ reaction method, and belongs to the field of material engineering. According to the method, silicon powder, silicon carbide powder and a polymer material are taken as basic raw materials, ultralight polymer particles are taken as a pore-forming agent, carbon generated by pyrolysis of resin and the silicon powder are subjected to high-temperature in-situ reaction to generate porous silicon carbide wave-absorbing ceramic, the reaction sintering temperature, the sintering time and the particle size of the silicon powder are adjusted, the proportion of alpha-phase silicon carbide to beta-phase silicon carbide is changed, and the porous silicon carbide wave-absorbing ceramic is prepared. The aim of regulating the dielectric constant of the material is fulfilled. The porous silicon carbide prepared by the method contains a large number of spherical closed pore structures, so that the volume fraction can be effectively reduced, the loss mechanism is increased, and the thermal shock resistance is improved. The porous silicon carbide ceramic prepared by the invention has the characteristics of high temperature resistance, ablation resistance, broadband wave absorption, easiness in integrated molding of special-shaped components and the like.
本发明涉及适用极端环境吸波材料的制备技术，具体地说是一种利用原位反应法制备的轻质、宽频多孔碳化硅高温吸波材料，属于材料工程领域。该方法以硅粉、碳化硅粉、高分子材料为基本原料，以超轻高分子颗粒为造孔剂，由树脂热解生成的碳与硅粉高温原位反应生成多孔碳化硅吸波陶瓷，调节反应烧结温度、烧结时间及硅粉粒径尺寸，改变生成α相碳化硅与β相碳化硅的比例，进而实现调控材料介电常数的目的。利用本发明制备的多孔碳化硅含有大量球形闭孔结构，可以有效降低体积分数、增加损耗机制，提高抗热震性能。本发明制备的多孔碳化硅陶瓷具有耐高温、抗烧蚀、宽频带吸波及易于异形构件一体化成型等特点。
The invention relates to a preparation technology of a wave-absorbing material applicable to an extreme environment, in particular to a light broadband porous silicon carbide high-temperature wave-absorbing material prepared by an in-situ reaction method, and belongs to the field of material engineering. According to the method, silicon powder, silicon carbide powder and a polymer material are taken as basic raw materials, ultralight polymer particles are taken as a pore-forming agent, carbon generated by pyrolysis of resin and the silicon powder are subjected to high-temperature in-situ reaction to generate porous silicon carbide wave-absorbing ceramic, the reaction sintering temperature, the sintering time and the particle size of the silicon powder are adjusted, the proportion of alpha-phase silicon carbide to beta-phase silicon carbide is changed, and the porous silicon carbide wave-absorbing ceramic is prepared. The aim of regulating the dielectric constant of the material is fulfilled. The porous silicon carbide prepared by the method contains a large number of spherical closed pore structures, so that the volume fraction can be effectively reduced, the loss mechanism is increased, and the thermal shock resistance is improved. The porous silicon carbide ceramic prepared by the invention has the characteristics of high temperature resistance, ablation resistance, broadband wave absorption, easiness in integrated molding of special-shaped components and the like.
本发明涉及适用极端环境吸波材料的制备技术，具体地说是一种利用原位反应法制备的轻质、宽频多孔碳化硅高温吸波材料，属于材料工程领域。该方法以硅粉、碳化硅粉、高分子材料为基本原料，以超轻高分子颗粒为造孔剂，由树脂热解生成的碳与硅粉高温原位反应生成多孔碳化硅吸波陶瓷，调节反应烧结温度、烧结时间及硅粉粒径尺寸，改变生成α相碳化硅与β相碳化硅的比例，进而实现调控材料介电常数的目的。利用本发明制备的多孔碳化硅含有大量球形闭孔结构，可以有效降低体积分数、增加损耗机制，提高抗热震性能。本发明制备的多孔碳化硅陶瓷具有耐高温、抗烧蚀、宽频带吸波及易于异形构件一体化成型等特点。
Lightweight broadband porous silicon carbide high-temperature wave-absorbing material prepared by in-situ reaction method
一种利用原位反应法制备的轻质、宽频多孔碳化硅高温吸波材料
13.08.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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