Journal of Inorganic Materials >
Process Control of PyC Interphases Microstructure and Uniformity in Carbon Fiber Cloth
Received date: 2023-11-03
Revised date: 2024-01-01
Online published: 2024-01-08
Supported by
National Key Research and Development Program of China(2022YFB3706100)
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
Yifan XUE , Weijie LI , Zhongwei ZHANG , Xu PANG , Yu LIU . Process Control of PyC Interphases Microstructure and Uniformity in Carbon Fiber Cloth[J]. Journal of Inorganic Materials, 2024 , 39(4) : 399 -408 . DOI: 10.15541/jim20230512
表1 实验设计参数Table 1 Design parameters for experiment |
Group | T/℃ | pC3H6/kPa | τ/s | pH2/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 |
图2 三个典型代表样品的TEM表征结果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) |
表2 PyC界面相XRD半峰全宽、拉曼光谱R(R=ID/IG)汇总及织构分类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 |
ID/IG | 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 |
ID/IG | 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 |
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