Comparison of laser irradiation behavior of plasma-sprayed Ba_2-XSr_xSmTaO₆coatings

With the rapid development of laser technology, the protection of production equipment and personnel is of great necessity. Thermal barrier laser protection material has the advantages of a high protection threshold and a low temperature increasing rate that attracts lots of concerns. Ba2-xSrxSmTaO6 (x = 0-2) was believed to have potential use as a thermal barrier laser protection material because of its low thermal conduction and good thermal stability. However, its laser damage mechanism is still unclear. Thus, in this paper, we investigated and compared the laser damage behaviors as well as the protective thresholds of Ba2-xSrxSmTaO6. During the laser irradiation, all five kinds of coatings underwent similar damage processes. The coatings underwent irradiation center turning bright, grain recrystallization, and melt. Ba2SmTaO6 (x = 0) showed the highest protective threshold of 2000 W/cm2 for 10 s, and x = 0.5 coatings showed the lowest protective threshold that was 1000 W/cm2 for 26 s. BaSrSmTaO6 (x = 1) presented the lowest value in back-surface temperature, and Ba2SmTaO6 was only slightly higher than it. In conclusion, because of the best laser protection performance of Ba2SmTaO6, it is believed to be the most potential laser protective material among the five components.