Modification of Oxidation Resistance for Low Density Carbon-bonded Carbon Fiber (CBCF) Composite

doi:10.15541/jim20170445

Abstract

Abstract:

Perhydropolysilazane (PHPS) derived SiON coatings were deposited on surface of chopped carbon fiber in carbon-bonded carbon fiber (CBCF) composite by precursor infiltration-thermal (PIT) conversion method. Morphology and elemental analysis of SiON coating were investigated by SEM and EDS. The results show that the coatings are uniform, dense and mainly composed of Si, O and N elements. Meanwhile, the coating gets thicker with the increasing concentration of PHPS, but tends to agglomerate in the opening pores, especially when the concentration of PHPS reaches 10wt% and 20wt%, obvious agglomeration emerges in the opening pores. Meanwhile, cracks appear in the coating on the carbon fibre surface. Finally, oxidation resistance of CBCF composites treated by SiON coating was studied by TGA analysis and isothermal oxidation assessment. The results show that SiON coatings deposited on the carbon fiber surface in CBCF composite can remarkably enhance the oxidation resistance of CBCF, and the oxidation resistance increases with the increasing concentration of PHPS.

Key words: perhydropolysilazane, carbon-bonded carbon fiber (CBCF), precursor infiltration thermal conversion (PIT), SiON coating, oxidation resistance

CLC Number:

TQ174

SHI Jian-Jun, ZHANG Zong-Bo, FENG Zhi-Hai, ZHANG Da-Hai, WANG Yun, XU Cai-Hong. Modification of Oxidation Resistance for Low Density Carbon-bonded Carbon Fiber (CBCF) Composite[J]. Journal of Inorganic Materials, 2018, 33(7): 728-734.

Figures/Tables 13

Fig. 1 Optical picture (a) and SEM micrograph (b) of high porosity carbon-bonded carbon fiber (CBCF) composite

Fig. 2 Conversion process of PHPS precursor in air

Fig. 3 FT-IR spectra of PHPS uncured and cured at 100℃ for 1 h

Fig. 4 EDS spectra of SiON coatings prepared at different PHPS concentrations

Table 1 Contents of elements on the surface of uncoated and coated carbon fiber

Samples	Contents of elements/wt%(at%)
Samples	Si	O	N	C
CBCF	0.72(0.32)	5.76(4.41)	0.73(0.64)	92.79(94.64)
PHPS3	13.65(6.47)	5.81(4.83)	2.97(2.82)	77.56(85.88)
PHPS5	13.76(6.64)	13.15(11.14)	1.67(1.62)	71.41(80.60)
PHPS10	13.51(6.41)	6.56(5.45)	2.59(2.46)	77.34(85.65)
PHPS20	13.72(6.65)	5.71(4.78)	2.51(2.43)	78.06(86.15)

Fig. 5 SEM images of the coatings on carbon fiber surface in cured CBCF composite at different concentrations of PHPS (a) PHPS3; (b) PHPS5; (c) PHPS10; (d) PHPS20

Table 2 Coating thickness and volume densities of the CBCFs prepared at different concentrations of PHPS

Samples	CBCF	PHPS3	PHPS5	PHPS10	PHPS20
Density/(g•cm^-3)	0.22	0.23	0.25	0.29	0.33
Coating thickness/µm	0	0.26	0.32	0.33	0.41

Fig. 6 Weight loss curves of CBCF composites coated with SiON coatings

Table 3 TGA data of CBCF composites coated by SiON coatings prepared with different PHPS concentrations at air

Samples	CBCF	PHPS3	PHPS5	PHPS10	PHPS20	PHPS100
W ^*/%	0	6.0	14.5	26.2	57.6	-
T_d5/℃	442	644	649	650	653	-
T_d10/℃	506	656	659	660	667	-
Residue/ (1000℃, %)	0	8.6	17.8	30.8	52.5	105.4

Fig. 7 Mass changes of CBCF composites modified by PHPS after isothermal oxidation tests at different temperatures

Fig. 8 XPS plots of PHPS20 after isothermal oxidation assessments

Fig. 9 Optical images of CBCF composites after isothermal oxidation tests at 620℃(a) CBCF; (b) PHPS20

Fig. 10 XRD pattern of PHPS20 after isothermal-oxidation test at 620℃

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