不同粘结剂对碳纳米管红外吸收涂层性能的影响

碳纳米管涂层已在低温工作环境中大量应用,所选用的粘结剂在很大程度上影响其红外吸收性能及与基体的结合性能。分别用水玻璃粘结剂和磷酸盐粘结剂与碳纳米管、镍粉混合制成涂料,并将其涂覆在铜基体表面。采用XRD和SEM对涂层的红外吸收性能、物相、晶体结构及形貌进行了表征;测试了涂层的抗热震性能。结果表明:当粘结剂为磷酸盐、含量为90%~85%时,1 400~3 570 cm~(-1)(2.80~7.14μm)波段内涂层的平均光吸收度达1.992~2.084,红外吸收性能最佳,抗热震次数可达35次(25~120℃),满足了用户要求(10次)。

Effect of Different Binder on Performance of Carbon Nanotubes Infrared Absorbing Coating

Coating material was prepared by mixing the sodium silicate binder and phosphate binder with carbon nanotubes / nickel powder (CNTs/Ni powder) base respectively,and then coating was overlaid on the Cu substrate.IR,XRD and SEM were employed to characterize the infrared absorbing performance,phase composition,crystal structure and morphology of coating and evaluate the thermal shock resistance of coating.Results showed that when the phosphate binder was chosen and its content was 85％,the prepared coating possessed the optimal infrared absorbing property with absorbance of 2.084 in waveband range of 1 400～3 570 cm-1(2.80～7.14 μm),and the coatings exhibited excellent good resistance to thermal shock between 25 ℃ and 120 ℃ up to 35 times,higher than the user requirements 10 times.