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

doi:10.1016/j.jmst.2019.11.036

J. Mater. Sci. Technol. ›› 2020, Vol. 47: 38-44.DOI: 10.1016/j.jmst.2019.11.036

• Research Article • Previous Articles Next Articles

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

Wenzhi Li^a^,^b, Lihong Gao^a^,^b^,^*(), Zhuang Ma^a^,^b, Yanbo Liu^a^,^b, Fuchi Wang^a^,^b, Jiawei Wang^c, Lijun Wang^c, Hezhang Li^a^,^b

^aSchool of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
^bNational Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing 100081, China
^cState Key Laboratory of Laser Interaction With Matter, Northwest Institute of Nuclear Technology, Xi’an, 710024, China

Received:2019-06-26 Revised:2019-11-11 Accepted:2019-11-23 Published:2020-06-15 Online:2020-06-24
Contact: Lihong Gao

Abstract

Abstract:

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.

Key words: Ablation behavior, High power laser, Plasma sprayed coating

Wenzhi Li, Lihong Gao, Zhuang Ma, Yanbo Liu, Fuchi Wang, Jiawei Wang, Lijun Wang, Hezhang Li. Effect of Ni content on high power laser ablation behavior of coatings sprayed by Ni covering graphite/SiO₂ powders[J]. J. Mater. Sci. Technol., 2020, 47: 38-44.

Figures/Tables 9

Table 1 APS parameters of NGS coating.

Layer	Primary gas Ar (L/min)	Secondary gas He (L/min)	Current (A)	Carrier gas Ar (L/min)	Powder feed rate (g/min)	Spray distance (mm)	Gun speed (mm/s)
Bond layer	56.6	4.7	750	4.7	2.0	100	500
Top layer	42.5	16.5	850	4.7	3.0	75	500

Fig. 1. XRD patterns of NGS coatings with different Ni content before laser irradiation.

Fig. 2. Mass ratio of two kinds of plasma sprayed Ni-graphite/SiO2 coatings.

Fig. 3. SEM morphologies of NGS-1 coating: (a) surface morphology; (b) magnified surface morphology; (c) cross-section morphology.

Fig. 4. SEM morphologies of NGS-2 coating: (a) surface morphology; (b) magnified surface morphology; (c) cross-section morphology.

Fig. 5. Sample information of NGS-1 coating irradiated at 1000 W/cm2 for 10 s：(a) Surface macro-morphology; (b) XRD pattern at irradiation area; (c) SEM surface morphology and (d) magnified SEM surface morphology & EDS results.

Fig. 6. Sample information of NGS-2 coating irradiated at 1000 W/cm2 for 10 s: (a) Surface macro-morphology; (b) XRD pattern at irradiation area; (c) SEM surface morphology and (d) magnified SEM surface morphology.

Fig. 7. Reflectivity of as-sprayed coating and NGS1, NGS2 coatings after laser ablation.

Fig. 8. Back-surface temperature of NGS-1 and NGS-2 coatings during laser irradiation.

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

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