Wenzhi Li,Lihong Gao,Zhuang Ma,Yanbo Liu,Fuchi Wang,Jiawei Wang,Lijun Wang,Hezhang Li
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/SiO 2 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/SiO 2 coating with appropriate Ni content could realize the purpose of energy consumption by endothermal reaction of graphite/SiO 2 and reflection improvement. High Ni content will block the occurrence of endothermal reaction of graphite/SiO 2 and increase the heat diffusion to interior part of coating, which can make the ablation situation of coating more serious.
Wenzhi Li,Lihong Gao,Yanbo Liu,Zhuang Ma,Fuchi Wang,Hezhang Li
During the fabrication of functional high-endothermic-enthalpy graphite/SiO 2 composite coating , the oxidation and vaporization of raw materials have become serious issues in hyperthermal preparation environment. In this study, these issues were addressed through densification and modification of the feedstock powder. Then, the corresponding coating was prepared by optimized plasma-spraying parameters. By investigating the modified feedstock powder and the resulting splats and coatings by X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy, we realized an optimized composite feedstock powder preparation process and an ideal coating structure. The compactness of the powder reached its optimum after treating at 1400 °C for 2 h. After heat treatment densification and Ni shell covering processes, the modified powder exhibited good oxidation resistance , vaporization resistance, and spreading performance during plasma spraying . Thus, a pure and dense composite coating was prepared. Positive laser resistance performance was observed during the initial laser ablation test, which proved that this modified graphite/SiO 2 coating has good application potential in the laser protection field. Moreover, this study provides an experimental basis and a feasible method for difficult-to-spray composite coatings’ preparation, such as graphite/SiO 2 composite.
危险品化学品经营许可证（带存储）