Ablation Capability of Flake Graphite Reinforced Barium-phenolic Resin Composite under Long Pulse Laser Irradiation

doi:10.3724/SP.J.1077.2012.00157

Abstract

Abstract:

The carbon fiber reinforced phenolic resin composite is widely used as a thermal protection material because of its excellent thermal ablation. A novel flake graphite reinforced barium-phenolic resin composite was made by roller coating technology and its thermal ablation capability under long pulse laser irradiation was studied. The results show that the thermal ablation rate of the flake graphite reinforced barium-resin composite is 32.8 μg/J at 1700 W/cm² irradiation power density, which is much lower than that of the carbon fiber reinforced barium-resin composite or barium-phenolic resin obviously. The anti-ablative mechanism of the flake graphite reinforced barium- phenolic resin composite is investigated by the observation of its microstructure and the calculation of the laser energy coupling with the material. It is found that the flake graphite is arrayed homogeneous alignment as sandwich among the composite. When the laser radiation gets on the composite, the flake graphite plays as a mirror and reflects part of the laser, and then the laser radiation energy deposition on the composite is reduced. It is also found that the size of the flake graphite also affects the ablation capability. The composite with the flake graphite diameter of about 0.5 mm has the lowest thermal ablation rate.

Key words: flake graphite, laser ablation, millisecond pulse laser, thermal ablation rate, ablation mechanism

CLC Number:

TQ127

YU Qing-Chun, WAN Hong. Ablation Capability of Flake Graphite Reinforced Barium-phenolic Resin Composite under Long Pulse Laser Irradiation[J]. Journal of Inorganic Materials, 2012, 27(2): 157-161.

Figures/Tables 8

Table 1 Physical property of adopted material

Samples	Reinforcement	Reinforcement type	Mass fraction of reinforcement/%	Density/ (g·cm^-3)	Porosity /%
0^#	-	-	-	1.20	0.7
32^#	Flake graphite	F32	67.93	0.92	34.8
50^#	Flake graphite	F50	57.52	1.13	18.1
80^#	Flake graphite	F80	56.02	1.19	12.9
C_f^#	Carbon fiber	T300	62.05	1.34	7.5

Fig. 1 Thermal ablation rate of three kinds of flake graphite reinforced barium-phenolic resin composites vs average power density

Fig. 2 Thermal ablation rate of barium-phenolic resin vs average power density

Fig. 3 Thermal ablation rates of carbon fiber reinforced barium- phenolic resin vs average power density

Fig. 4 Abridged general view of the ablation composites profile

Table 2 Comparison between flake graphite reinforced barium-phenolic resin and fiber carbon reinforced barium-phenolic resin with laser energy coupling

Composite	Average power energy /(W·cm^-2)	Laser energy/J	Mass ablation of composite /g *	Mass ablation of reinforcement/g	Ablation energy/J**	Reflected and radiation energy/J
50^#	1454.3	895.0	0.0273	0.0021	309.5	585.5
C_f^#	1332.4	820.0	0.0537	0.0037	588.3	231.7

Fig. 5 Reflectance ratio of flake graphite and carbon fiber vs incident wavelength

Fig. 6 Optical microscope images of the profile surfaces of flake graphite reinforced barium-phenolic resin

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