爆炸喷涂自敏发光复合涂层组织及性能

Structure and properties of self-sensitive luminescent composite coatings prepared by detonation gun spraying

采用ADM-4D型气体爆炸喷涂设备,在45#钢基体上制备高铝青铜/SrAl2O4∶Eu2+,Dy3+磷光粒子耐磨自敏发光复合涂层.分析复合涂层微观形貌及发光强度,并测试了涂层摩擦磨损性能.结果表明:当喷涂的氧燃比值由1.3增大至2.3时,复合涂层中SrAl2O4磷光粒子沉积率增加了近78.6%,涂层更加致密,硬度和结合强度分别提高了24%和75%.当氧燃比值为1.3时,复合涂层中沉积的有效发光粒子比率最高,达到9.7%,涂层宏观发光强度也最高,紫外灯激发后的涂层宏观指示效果最好;当氧燃比值为2.3时,复合涂层与304不锈钢对磨时摩擦系数升高近35%,而磨损率降低约47%.

Wear-resistant and self-sensitive luminescent composite coatings,made of high-aluminum bronze mixed with SrAl2O4:Eu2+,Dy3+particles,were successfully prepared on steel 45#substrate by using ADM-4D detonation gun spraying device.Structural morphologies and luminous intensities of the composite coatings were observed and analyzed and further friction and wear behaviors of the composite coatings were investigated.Results show that the deposition rate of SrAl2O4 particles in the composite coating increases nearly 78.6%when the oxygen-fuel ratio of the detonation spraying goes up from 1.3 to 2.3,and thus the composite coatings become more densified,and the hardness and the bonding strength increases 24%and 75%respectively as a result.At an oxygen-fuel ratio of 1.3,the proportion of phosphorescent particles deposited effectively on the surface of the composite coatings reaches,up to 9.7%.The macroscopic luminescence intensity of the coatings becomes therefore highest in this case,and consequently the macroscopic indication effect of the coatings excited by UV lamp becomes also the best.The friction coefficient between the composite coatings and the 304 stainless steel increases by nearly 35%,whereas the wear rate decreases by about 47%,when the oxygen-fuel ratio rises up to 2.3.