共查询到19条相似文献,搜索用时 859 毫秒
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多波段激光防护PMMA材料的制备 总被引:1,自引:0,他引:1
以聚甲基丙烯酸甲酯(PMMA)为基材.在基材中加入防激光吸收剂IR530、IR1065,制备了能有效吸收488nm、514nm、530nm、1060nm等多个波长激光的PMMA材料。通过实验研究确定了防激光吸收剂IR530、IR1065的加入量和激光防护PMMA材料的制备工艺参数。结果表明,多波段激光防护PMMA材料在488nm、514nm、530nm处的透过率为0.01%,在1060nm处的透过率为0.02%,具有良好的激光防护性能。同时防激光吸收剂的加入对材料的冲击强度影响很小。 相似文献
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《Ceramics International》2022,48(21):31389-31396
With the development of laser technology, laser-related materials have been widely studied. Both laser stealth coatings and laser protective coatings are currently the focus of attention. However, less research has been done on laser stealth and protective integrated coatings. In this paper, plasma-sprayed Y2O3–Ti3AlC2 coatings were prepared with low-power (LP) and high-power (HP) parameters, and their laser stealth and laser protection properties were characterized. The LP coating and HP coating appeared to have lower reflectivity at 1064 nm because a low-reflectivity second phase and many loose flocs on the surface are introduced, which indicates excellent laser stealth performance. When irradiated by a laser, the LP coating exhibited excellent laser protection ability, and its reflectivity increased after irradiation because Ti3AlC2 oxidized and decomposed and densely arranged small particles formed on the surface. The LP coating perfectly protected the 500-W laser irradiation for 20 s. In addition, the laser damage threshold of the LP coating was 5.599 s at 1000-W laser irradiation, which indicates that the LP Y2O3–Ti3AlC2 coating is a potential material with laser stealth and laser protection integration. 相似文献
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Chen Ma Zhuang Ma Lihong Gao Yanbo Liu Taotao Wu Yongxiang Zhu Fuchi Wang 《Ceramics International》2018,44(17):21374-21380
Composite coatings consisting of flake graphite and SiO2 fillers in a hyperbranched polycarbosilane (HBPCS) matrix were designed and prepared to meet the requirements of laser protection. The laser ablation behavior of the composite coatings were investigated. Control experiments were designed to study the performance of SiO2 during laser irradiation. The results show that the introduction of SiO2 changes the anti-laser protective mechanism and can improve the anti-laser property of the coating. High power laser irradiation results in pyrolysis of HBPCS and the formation of SiC particles. Chemical reactions between SiO2, graphite, and SiC play an important role in consuming energy, and provide an excellent cooling effect to the substrate, leading to decreased temperature. SiC particles formed on the surface of the laser ablation area act as a shield to prevent the laser from irradiating deeper layers of the coating. Due to the cooling effect and thermal stability of SiC, the proposed coating shows a good anti-laser property. 相似文献
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颗粒介质的抗红外辐射方式是飞行器尾焰隐身的重要手段之一。为促进颗粒系材料抑制红外辐射的研究和发展,对尾焰隐身进行了系统分析。红外辐射抑制的内涵在于改变红外波段和削弱红外辐射的强度。通过综述粉煤灰基沸石的研究进展、颗粒材料气溶胶抑制红外辐射和喷射方式的研究进展,结合飞行器尾焰辐射组分分析,总结了目前存在的问题和日后的发展方向。粉煤灰作为火力发电厂产生的固体废弃物之一,具有产量高、成本低的特点。提出将粉煤灰在一定条件下合成沸石分子筛,并进一步制备粉煤灰基沸石负载改性二氧化钛材料,将其作为颗粒系应用材料,用于尾焰红外辐射的抑制,可以实现变废为宝,在降低制备成本的前提下保护了环境与人类健康,促进社会的可持续发展。对目前沸石各成分抑制红外辐射效果的研究进行了综述,利用其对高红外辐射气体的强吸附性以及改性二氧化钛的光催化性能进行可行性分析,设计了颗粒吸附和遮蔽喷射结构,充分展示了粉煤灰基沸石的优势,并对该材料在飞行器尾焰隐身方面的应用前景提出展望。 相似文献
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《Ceramics International》2019,45(12):14968-14975
Further utilization of aircraft structural materials is threatened by the fact that high-intensity continuous lasers are widely used in the field of military defense. To protect the aircraft structure from laser damage, ammonium polyphosphate filled polybenzoxazine composite coatings were prepared on the substrate. The anti-laser ablation characteristics of the coatings were investigated. Results showed that the addition of the inorganic filler improved the anti-laser ablation performance of polybenzoxazine. The back-surface temperature of substrates covered with the composite coatings was more 50% lower than that in the case of a pure polybenzoxazine coating after laser ablation. Further, the residue of the composite coating could be vertically divided into three distinct regions, with the dense surface char layer and the porous pyrolysis layer acting as shielding layers for the laser beam and preventing any heat-related transformations from occurring. The addition of the inorganic particles improved the surface reflectivity of the coatings resulting in much more laser energy dissipation. The decreased pyrolysis rate ensured that the pneumatic cooling effect of pyrolysis gas was more lasting and stable, owing to which the composite coatings could act as effective thermal protection layer for longer. These results confirmed that the inorganic filler modified polybenzoxazine coating exhibits excellent anti-laser properties and are suitable for protecting structural materials from laser-related damage. 相似文献
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火灾预警系统的核心之一是新型传感材料。MXene及其衍生物具有较高电子传导率和超大比表面积、独特的温敏性及气敏性,可实现对早期火灾的快速可靠预警,因此,在火灾预警传感器领域具有广泛的应用前景。该文首先回顾了温敏型MXene基火灾预警器的预警机制及其纸类与涂层类器件在火灾预警领域的发展现状,随后介绍了气敏型MXene基火灾预警器的预警机制及国内外近年来MXene及其衍生物在NH3、NO2、CO等气体检测的研究进展。重点总结了MXene在火灾预警领域高性能化、多功能化的发展趋势,并对MXene基火灾预警器后续发展趋势进行了展望。最后,指出未来MXene基火灾预警器应通过开发新型MXene基敏感材料以进一步缩短其响应触发时间、提高火灾预警的快速性与准确性,并考虑赋予器件自修复性、电磁屏蔽性、疏水性等多功能性,同时将其与物联网联动实现智能消防,使其更适合复杂环境和实际工程应用。 相似文献
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环保、节能、高效是保温材料未来的主要研究方向, 开发以生物质为原料的保温材料是未来趋势。生物质基多孔材料是指以可再生的生物质为前驱体制备的多孔材料, 其原料来源广, 制备方法多样, 具有孔隙率高、密度小、质量轻等优异特点, 在保温领域有很大的应用潜力。本文概述了多孔材料的保温机理, 并综述了近几年国内外对纤维素基、淀粉基、壳聚糖基、植物蛋白基多孔材料的研究, 重点介绍了表面活性剂发泡法、冷冻干燥法、致孔剂法、模具热压法、溶剂交换相分离法等在生物质基多孔材料制备中的应用。分析了生物质多孔材料存在的问题, 并对多孔保温材料未来的研究方向进行了展望。 相似文献