Effect of Ni content on high power laser ablation behavior of coatings sprayed by Ni covering graphite/SiO₂ powders

Faced with the challenge of high energy ablation problems, especially for laser ablation, effective energy dissipation protective materials fabricate by efficient preparation method is a feasible solution. The Ni-graphite/SiO₂ coatings with different Ni content were prepared by plasma spraying method with optimized plasma spraying parameters. All coatings are pure without oxidation and dense. Their ablation behaviors were investigated by high power continuous wave laser. The results indicate that the Ni-graphite/SiO₂ coating with appropriate Ni content could realize the purpose of energy consumption by endothermal reaction of graphite/SiO₂ and reflection improvement. High Ni content will block the occurrence of endothermal reaction of graphite/SiO₂ and increase the heat diffusion to interior part of coating, which can make the ablation situation of coating more serious.