Microstructure and mechanical properties of SiC<sub>f</sub>/SiC brazed joints

Fig. 8. Fracture behavior of SiC_f/SiC brazed joint (color online)(a) Cross-sectional micrograph of SiC_f/SiC brazed joint before shear test, (b) Cross-sectional micrograph of SiC_f/SiC brazed joint under 850 ℃, (c) Cross-sectional micrograph of SiC_f/SiC brazed joint under 870 ℃, (d) Cross-sectional micrograph of SiC_f/SiC brazed joint under 890 ℃

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Fig. 9. Fracture description of SiC_f/SiC brazed joint under 890 ℃ (color online) (a) Fracture behavior schematic diagram, (b) Fracture morphology photograph of SiC_f/SiC brazed joint

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Table 1. Process parameters of chemical vapor deposition (CVD) and chemical vapor infiltration (CVI)

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Table 1. Process parameters of chemical vapor deposition (CVD) and chemical vapor infiltration (CVI)

沉积项

Deposited product

原料

Raw material

沉积温度

Deposition temperature / ℃

压力

Pressure / kPa

时间

Time / h

热解炭界面层PyC interphase

甲烷Methane

1 000⁓1 100

5⁓10

SiC基体SiC matrix

甲基三氯硅烷Methyltrichlorosilane

1 100⁓1 200

3⁓5

150

Table 2. Element composition of SiC_f/SiC brazed joint interface (atm.%)

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Table 2. Element composition of SiC_f/SiC brazed joint interface (atm.%)

点Point	碳 C	硅 Si	银 Ag	铜 Cu	钛 Ti	可能相Possible phase
1	10.65	44.38	0.3	6.03	38.64	Ti₅Si₃
2	8.63	—	2.54	88.52	0.31	Cu(s,s)
3	—	—	100	—	—	Ag(s,s)
4	10.58	40.08	1.49	6.35	41.5	Ti₅Si₃
5	8.41	—	3.22	88.22	0.16	Cu(s,s)
6	9.39	30.22	7.51	2	50.28	TiC+Ti₅Si₃
7	8.17	41.65	3.97	4.04	42.18	Ti₅Si₃
8	8.58	35.84	6.6	4.82	44.16	Ti₅Si₃

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Baoliang ZHANG, Hongqiang ZHANG, Menghe TU, Yu ZHANG, Wei GUO. Microstructure and mechanical properties of SiC_f/SiC brazed joints[J]. NUCLEAR TECHNIQUES, 2025, 48(5): 050601

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