羰基铁/有机硅树脂吸波涂层的损伤行为对吸波性能的影响

doi:10.15541/jim20260220

摘要/Abstract

摘要： 吸波涂层的结构完整性与性能可靠性, 是决定材料在全寿命周期内维持低可探测性的关键因素。针对涂层在服役过程中因机械损伤导致的吸波性能退化问题, 本研究采用喷涂工艺在钛合金基板上制备了厚度为1.0 mm的羰基铁/有机硅树脂吸波涂层, 通过控制划痕、磨损和脱落三种典型损伤形式的几何参数(位置、面积、深度), 系统设计并制备了系列损伤试样, 开展了典型损伤特征研究。利用弓形反射法测试了各试样在2~18 GHz频段的反射率, 系统分析了损伤形式、面积及深度对吸波性能的影响规律。结果表明: 当损伤面积≤20%时, 划痕与浅层磨损(深度≤0.4 mm)对涂层吸波性能影响较小, 涂层在8~18 GHz范围内仍保持低于-10 dB的反射率; 而脱落损伤对性能的影响最为显著, 当脱落面积达到10%时, 涂层反射率即劣化至-10 dB以上。本研究确定了临界损伤参数(中心区域磨损(形式3#), 深度0.6 mm, 面积20%; 边缘、条带状脱落(形式2#、3#), 面积20%~30%), 为后续吸波涂层的损伤评估与修复研究提供了关键实验依据。

关键词: 羰基铁粉, 吸波涂层, 损伤试样, 吸波性能, 反射率

Abstract: Structural integrity and performance reliability of microwave-absorbing coatings are critical to the operational survivability of radar-absorbing structures throughout their service life. To address performance degradation induced by in-service coating damage, this study systematically investigated characteristic damage modes and developed representative microwave-absorbing coating specimens exhibiting prototypical damage morphologies. Using a carbonyl iron powder/organic silicone resin composite absorber as the model system, a 1.0-mm-thick functional coating was uniformly deposited onto a titanium alloy substrate via spray coating. Subsequently, by controlling the geometric parameters (position, area, depth) of three typical damage forms (scratch, wear, and detachment), a series of damaged samples were designed and fabricated, yielding standardized specimens for controlled experimental evaluation. Reflectivity was measured across the 2-18 GHz frequency band using the arch (bow-tie) method. Systematic analysis revealed the distinct influence of damage type, extent, and severity on electromagnetic wave absorption performance. Results indicate that for damage areas ≤20%, superficial scratches and mild wear (depth ≤0.4 mm) cause only marginal degradation, and the coating retains effective absorption (reflectivity ≤-10 dB) within the 8-18 GHz band. In contrast, detachment exhibits the most pronounced detrimental effect. Once the delaminated area reaches 10%, the reflection loss exceeds -10 dB across the target band. The critical damage parameters (wear in the central area (form 3#), depth 0.6 mm, area 20%; edge and strip like detachment (forms 2# and 3#), area 20%-30%) determined in this study provide key experimental basis for the subsequent damage assessment and repair research of microwave absorbing coatings.

Key words: carbonyl iron powder, absorbing coating, damaged sample, microwave absorption performance, reflectivity

中图分类号:

TB34

郑璇, 卿玉长. 羰基铁/有机硅树脂吸波涂层的损伤行为对吸波性能的影响[J]. 无机材料学报, DOI: 10.15541/jim20260220.

ZHENG Xuan, QING Yuchang. Impact of Damage Behavior of Carbonyl Iron/Organosilicon Resin Microwave Absorbing Coating on Its Absorbing Performance[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260220.

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