材料期刊网

目的：降低涂层厚度波动范围，提高吸波性能的稳定性。方法通过资料分析，选用空气辅助无气喷涂工艺，综合空气喷涂和无气喷涂工艺的优点，改进喷嘴，实现喷雾流量和雾化幅度等工艺参数的精确控制。进行喷涂参数优化试验和吸波性能检测，获得最佳喷涂工艺。结果采用空气辅助无气喷涂工艺和改进的喷嘴，调节喷幅在5～30 mm，采用5次喷涂，每次喷涂20～24 min，获得的吸波涂层表面平整，没有直径大于50μm的颗粒。喷涂的2 mm厚涂层单位面积厚度的偏差从200μm降低到60μm以下，吸波性能从5 dB降到2 dB以下。结论研制出的吸波涂层精准厚度涂装工艺，可根据涂装基准面的形态和结构选择不同喷幅的喷嘴调节雾化，实现厚涂层吸波涂料的均匀喷涂，大幅度提高吸波涂层的涂装质量。

Objective To reduce fluctuation range of coating thickness and enhance stability of wave absorbing performance. Methods Air assisted air less spraying coating technology was selected through data analysis, which integrated the advantages of air spraying coating technology and air less spraying coating technology and improved nozzle to realize accurate control of technical parameters, such as spraying flow and spraying range; coating experiment and wave absorbing performance test were carried out to optimize coating parameters. Results The improved nozzle using air assisted air less spraying coating technology had spraying range in 5~30 mm. When spraying for 5 times with 20~24 min every time, the obtained wave absorbing coating surface was smooth without large grain of diameter larger than 50 μm; thickness fluctuation per unit area of coated 2 mm coating decreased from 200 μm to 60 μm, which reduced the decrease of wave absorbing performance from 5 dB to less than 2 dB. Conclusion The accurate thickness coating technology for wave absorbing coating can adjust spraying according to the form and structure of the reference plane to be coated, and realize even spray coating of wave absorbing coating, which greatly improves the coating quality of wave absorbing coating.