Process Control of PyC Interphases Microstructure and Uniformity in Carbon Fiber Cloth

doi:10.15541/jim20230512

Abstract

Abstract:

Mechanical properties of ceramic matrix composites are highly dependent on the microstructure and homogeneity of the interphase. This study examined the influence of process factors, such as deposition temperature, propylene partial pressure, retention time, and hydrogen partial pressure, on the microstructure and homogeneity of PyC interphase deposited on the surface of carbon fiber cloth. Various characterization techniques were used to characterize the microstructure and texture of the PyC interphase, and the inherent correlation between microstructure, uniformity, and process parameters was analyzed. The results show that increasing temperature and propylene partial pressure lead to a more regular texture in the interphase, while decreasing hydrogen partial pressure has the opposite effect, and retention time has little effects. Additionally, an increase in deposition temperature and propylene partial pressure leads to an uneven distribution of interphase thickness, and overhigh propylene partial pressure directly leads to the production of carbon black. Increasing retention time helps to improve interphase homogeneity. The interphase uniformity of medium and high textures firstly drops and then increases when the hydrogen partial pressure increases, but the interphase uniformity of low texture is less impacted. Ultimately, the study clarified the growth method of the PyC interphase. Furthermore, the research delved into the process factors influencing the texture and uniformity of the PyC interphase, which provided a basis for the fine regulation of PyC interface phase in the future.

Key words: ceramic matrix composite, PyC interphase, uniformity, microstructure

CLC Number:

TQ174

XUE Yifan, LI Weijie, ZHANG Zhongwei, PANG Xu, LIU Yu. Process Control of PyC Interphases Microstructure and Uniformity in Carbon Fiber Cloth[J]. Journal of Inorganic Materials, 2024, 39(4): 399-408.

Figures/Tables 33

Fig. 1 Schematic diagram of mold

Table 1 Design parameters for experiment

Group	T/℃	p_C3H6/kPa	τ/s	p_H2/kPa
1	950	5	3	0
2	950	3	3	0
3	950	3	1	0
4	950	1	1	0
5	950	0.5	1	0
6	950	1	3	0
7	950	1	0.5	0
8	900	3	1	0
9	900	1	0.5	0
10	900	1	3	0
11	900	1	1	0
12	850	1	0.5	0
13	850	1	1	0
14	850	1	3	0
15	950	3	3	1.5
16	950	3	3	3
17	950	1	3	0.5
18	950	1	3	1
19	900	3	1	1.5
20	900	3	1	3

Fig. 2 TEM charaterizations of three typical samples (a) SEM image of interphase, (b) HRTEM image of interphase and (c) Fourier transform of HT (Group 2); (d) SEM image of interphase, (e) HRTEM image of interphase and (f) Fourier transform of MT (Group 4); (g) SEM image of interphase, (h) HRTEM image of interphase and (i) Fourier transform of LT (Group 8)

Table 2 Summary of XRD FWHM and R (R=ID/IG) for Raman spectra of PyC interphases, and texture classifications

	1	2	3	4	5	6	7	8	9	10
XRD FWHM/(°)	5.522	5.495	5.217	5.664	5.809	5.579	5.469	5.805	5.883	5.942
I_D/I_G	0.995	0.979	0.991	0.988	0.998	1.021	0.991	0.994	1.001	1.050
Texture	HT			MT				LT
	11	12	13	14	15	16	17	18	19	20
XRD FWHM/(°)	5.926	6.056	5.873	5.940	5.518	5.597	5.623	5.961	5.773	5.914
I_D/I_G	1.028	1.031	1.037	1.033	0.978	0.974	1.011	0.992	1.012	1.003
Texture	LT				HT		MT	LT

Fig. 3 (a) XRD patterns and (b) Raman spectra of PyC interphase on carbon fiber prepared by different fabrication processes

Fig. 4 Deposition mechanism and boundary conditions for (a) LT, (b) MT and (c) HT

Fig. 5 (a) Fixture layout diagram, (b) fixture main view and (c) sampling position of fiber fabric

Fig. 6 Deposition rate, uniformity and typical SEM images of cross-section of PyC interphases at various temperatures

Fig. 7 Deposition rate, uniformity and typical SEM images of cross-section of PyC interphases at various pC3H6

Fig. 8 Deposition rate, uniformity and typical SEM images of cross-section of PyC interphases at various residence time

Fig. 9 Deposition rate, uniformity and typical SEM images of cross-section of PyC interphases at various pC3H6 : pH2

Fig 10 Relationship between interphase deposition rate, deposition uniformity and texture of PyC interphase

Fig. 11 Influence factors of interphase uniformity and their relations with process parameters

Fig. S1 Group 1 SEM images

Fig. S2 Group 2 SEM images

Fig. S3 Group 3 SEM images

Fig. S4 Group 4 SEM images

Fig. S5 Group 5 SEM images

Fig. S6 Group 6 SEM images

Fig. S7 Group 7 SEM images

Fig. S8 Group 8 SEM images

Fig. S9 Group 9 SEM images

Fig. S10 Group 10 SEM images

Fig. S11 Group 11 SEM images

Fig. S12 Group 12 SEM images

Fig. S13 Group 13 SEM images

Fig. S14 Group 14 SEM images

Fig. S15 Group 15 SEM images

Fig. S16 Group 16 SEM images

Fig. S17 Group 17 SEM images

Fig. S18 Group 18 SEM images

Fig. S19 Group 19 SEM images

Fig. S20 Group 20 SEM images

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