天线罩表面导电涂层的制备工艺及性能研究

Study on preparation and properties of conductive coating on the surface of radome

为解决由碳纤维复合材料制备的雷达天线罩自身导电性能差、反射能力弱和空间防护能力不高的问题,先通过电弧喷涂技术在Q235钢模具表面制备铝涂层,然后在碳纤维复合材料固化的过程中将其转移至天线罩表面。研究了电弧喷涂时的主要工艺参数对铝涂层孔隙率的影响,得到最佳的工艺参数为:空气压力0.6 MPa,喷涂距离300 mm,喷涂电压28 V。扫描电镜表征和热淬法测试表明,通过上述方法在天线罩表面制备的导电涂层均匀连续,表面致密,无裂纹、空腔和外来夹杂物,结合力良好。

To improve the electrical conductivity,reflectivity,and space radiation resistance of radome made of carbon fiber composite material,an aluminum coating was prepared on the surface of Q235 steel die by electric arc spraying technology,and then transferred onto the surface of radome during the curing process of carbon fiber composite material.The effects of the key process parameters on the porosity of electric-arc-sprayed aluminum coating were studied.The optimal process parameters were determined as follows:air pressure 0.6 MPa,spraying distance 300 mm,and voltage 28 V.The scanning electron microscopic characterization and thermal shock testing result showed that the conductive coating prepared by the said method was uniform,intact,compact,and well-adhered to the radome surface without any cracks,cavities,and foreign inclusions inside.