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首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >Synthesis of (Ba4Zn2-xMnxFe36O60) U-type hexaferrite pigments and studying their influence on the protective performance, mechanical behavior and microwave absorption properties of polyurethane paint coatings
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Synthesis of (Ba4Zn2-xMnxFe36O60) U-type hexaferrite pigments and studying their influence on the protective performance, mechanical behavior and microwave absorption properties of polyurethane paint coatings

机译：（BA4ZN2-XMNXFE36O60）U型六氧化物颜料的合成，并研究它们对聚氨酯涂料涂料的保护性能，力学行为和微波吸收性能的影响

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摘要

A series of U-type hexaferrite ceramic powders Ba4Zn2-xMnxFe36O60 (x= 0.5, 1, and 1.5) were synthesized through the solid-state reaction (SSR) method and used as electromagnetic (EM) waves absorbing inorganic pigments to fabricate radar absorbing paint (RAP) coatings containing polyurethane matrix and talc as a filler. The colour properties and chemical stability of powder pigments were determined. Also, the crystalline structure and morphology of the synthesized pigments were characterized by X-ray diff ;raction (XRD) and scanning electron microscope (SEM) analysis. The effect of addition of these pigments to the polyurethane (PU) matrix on mechanical properties, corrosion performances and microwave absorption performances was investigated. The EM parameters and microwave absorbing properties of the RAP coatings applied on the aluminum substrate were measured in the X-band (8.2-12.4 GHz) frequency range by using vector network analyzer (VNA) and the scattering parameters method. The results showed that the mechanical properties such as microhardness, wear resistance and roughness were increased due to the addition of Mn content in the Zn-U type pigment. Also, the impact resistance was seen to increase with addition of Zn (decreasing x). The corrosion performance and adhesion strength of the coatings were examined using the salt spray and tape adhesion test, which exhibited that both of them were higher than non-pigmented polyurethane (NPPU) matrix coatings. The pigment composition with x = 1 led to an optimum microwave absorption of 97.55 % (or reflection loss RL = - 16.10 dB) at 9.82 GHz and 1.5 mm thickness. In addition, this composition coating displays a broad frequency bandwidth (- 4.03 GHz) for RL <=-10 dB (90 % MW absorption), in 8.2-12.4 GHz. This type of RAP coating, due to its small required thickness, light weight, wide band absorption and cost-effectiveness can be used for suppressing EM interferences and stealth applications.
机译：通过固态反应（SSR）方法合成了一系列U型六足陶瓷粉末Ba4zN2-XMNXFe36O60（x = 0.5,1和1.5），用作吸收无机颜料的电磁（EM）波制造雷达吸收涂料（RAP）含有聚氨酯基质和滑石作为填料的涂层。测定粉末颜料的颜色性质和化学稳定性。而且，通过X射线衍射进行合成颜料的晶体结构和形态; raction（XRD）和扫描电子显微镜（SEM）分析。研究了对机械性能，腐蚀性能和微波吸收性能的影响对聚氨酯（PU）基质的效果。通过使用载体网络分析器（VNA）和散射参数方法，在X波段（8.2-12.4GHz）频率范围内测量施加在铝基板上的RAP涂层的EM参数和微波吸收性能。结果表明，由于在Zn-U型颜料中加入Mn含量，增加了诸如显微硬度，耐磨性和粗糙度的机械性能。而且，通过添加Zn（减小X），观察到抗冲击性增加。使用盐喷雾和胶带粘附试验检查涂层的腐蚀性性能和粘附强度，胶带粘附试验表现出它们两者高于非着色聚氨酯（NPPU）基质涂层。用X = 1的颜料组合物在9.82GHz和1.5mm厚的97.55％（或反射损失R1 = -16.10dB）的最佳微波吸收。此外，该组合物涂层在8.2-12.4 GHz中显示RL <= - 10dB（90％MW吸收）的宽频带宽（ - 4.03GHz）。这种类型的RAP涂层由于其小必需的厚度，重量轻，宽带吸收和成本效益，可用于抑制EM干扰和隐形应用。

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