耐高温抗激光烧蚀涂层研制与性能表征

Development and Characterization of High-temperature and Laser Ablation Resistant Coating

以有机硅树脂、聚碳硅烷和玻璃粉为黏结剂,添加Al2O3,BN,SiC,ZrO2,SiO2和碳纤维等耐热填料制备了抗烧蚀涂层,对其物理机械性能进行了表征,同时分别采用马氟炉、氧乙炔焰烧蚀对其耐热抗烧蚀性能进行了表征。研究结果表明:玻璃粉、BN对改善涂层裂纹起关键作用,ZrO2对提高涂层隔热和耐烧蚀性能至关重要。所研制涂层在厚度为1mm的30CrMnSiA钢基材表面涂覆600μm,经受3000℃氧乙炔焰4s烧蚀,钢基材不发生穿孔;900μm厚度的涂层在531W/cm2激光功率密度下照射4s,带涂层钢基材背面温度比同等辐照温度下,空白钢板背面温度下降1000℃左右。

The ablation resistant coating was prepared by using organic silicon resin , polyethylene carbon silane as binder and Al2O3 , BN, SiC, ZrO2 , SiO2 , CF as filler. The physical and mechanical properties of the coating were characterized. The results show that the glass powder and BN play a key role to reduce cracks in the coating, as well as ZrO2 is crucial to improve the heat and ablation resistant capabilities of the coating. The lmm 30CrMnSiA steel substrate with 600μm coating would not be perforated by the ablation for 4 seconds from 3000℃ oxygen acetylene flame. When radiated from laser with power density of 531 W/cm^2 for 4s, the temperature of substrate can decrease more than 1O00℃ with the protection of 900μm coating.