激光熔覆制备多尺度金属陶瓷太阳能吸收涂层研究

Study on multi-scale cermet selective absorption coating prepared by laser cladding

采用激光熔覆法在不锈钢基体上首次制备了多尺度碳化钛基金属陶瓷涂层,利用SYSWELD软件对其进行温度场的模拟分析,模拟结果表明:熔宽、熔深与试验测量值相吻合,激光熔覆的稀释率约为11. 51%,说明涂层具有良好的冶金结合;激光熔覆制备的多尺度吸收涂层性能优异,吸收率为86%,发射率为4%;涂层经650℃退火后,光学性能几乎不变,且物相组成稳定,表明其具有优越的高温稳定性。研究表明,激光熔覆多尺度碳化钛基金属陶瓷太阳能吸收涂层高温稳定性能良好,适合应用于高温太阳能光热吸收领域。

Multi-scale TiC cermet-based coating was first prepared on stainless steel substrate by laser cladding. The SYSWELD software was used to simulate and analyze the temperature field. The simulation results showed that the weld width and weld depth were consistent with the measured values. The dilution rate of laser cladding was about11.51%, which indicated that the coating had good metallurgical bonding. The multi-scale absorption coating prepared by laser cladding had excellent performance, with an absorption rate of 86% and an emissivity of 4%. After the coating was annealed at 650 ℃, the optical properties were almost unchanged and the phase composition was stable. It showed that it had excellent high temperature stability. The results showed that the laser cladding multi-scale TiC cermet-based solar absorbing coating had good stability at high temperature. It was suitable for application in the field of high temperature solar photothermal absorption.