Joining of Cf/SiBCN composite with CuPd-V filler alloy

doi:10.1016/j.jmst.2018.01.001

Abstract

Abstract:

Two compositions of CuPd-V system filler alloy were designed for joining the C_f/SiBCN composite. Their dynamic wettability on the C_f/SiBCN composite was studied with the sessile drop method. The CuPd-8V alloy exhibited a contact angle of 57° after holding at 1170 °C for 30 min, whereas for CuPd-13V alloy, a lower contact angle of 28° can be achieved after heating at 1200 °C for 20 min. Sound C_f/SiBCN joints were successfully produced using the latter filler alloy under the brazing condition of (1170-1230)°C for 10 min. The results showed that the active element V strongly diffused to the surface of C_f/SiBCN composite, with the formation of V₂C/VN reaction layer. The microstructure in the central part of the joint brazed at 1200 °C was characterized by the V₂C/VN particles distributing scatteringly in CuPd matrix. The corresponding joints showed the maximum three-point bend strength of 82.4 MPa at room temperature. When the testing temperature was increased to 600 °C, the joint strength was even elevated to 108.8 MPa. Furthermore, the joints exhibited the strength of 92.4 MPa and 39.8 MPa at 800 °C and 900 °C, respectively.

Key words: C_f/SiBCN composite, Wettability, Joint strength, Interfacial reaction

Wen-Wen Li, Bo Chen, La-Mei Cao, Wei Liu, Hua-Ping Xiong, Yao-Yong Cheng. Joining of C_f/SiBCN composite with CuPd-V filler alloy[J]. J. Mater. Sci. Technol., 2018, 34(9): 1652-1659.

Figures/Tables 15

Table 1 Composition, liquidus temperature, heating condition in wetting experiment and contact angle of two filler alloys on Cf/SiBCN.

Filler alloy	Composition (wt %)	Liquidus temperature (°C)	Heating condition	Contact angle (deg.)
CuPd-8V	Cu-(35-42)Pd-8V	1134.4	1170 °C/30 min	57
CuPd-13V	Cu-(35-45)Pd-13V	1155.6	1200 °C/20 min	28

Fig. 1. Wetting morphologies of two kinds of filler alloys on Cf/SiBCN composite: (a, c) CuPd-8V (1170 °C/30 min); (b, d) CuPd-13V (1200 °C/20 min).

Fig. 2. Change of contact angle of CuPd-8V filler alloy with dwelling time at 1170 °C.

Fig. 3. Wetting kinetics of the CuPd-13V alloy on Cf/SiBCN composite: (a) change of contact angle with temperature, (b) change of contact angle with holding time at 1200 °C.

Fig. 4. Microstructure of the Cf/SiBCN composite joint brazed with CuPd-8V filler alloy at 1170 °C for 10 min: (a) at a low magnification, and (b) at a high magnification.

Fig. 5. Microstructure of the Cf/SiBCN joint brazed with CuPd-13V filler alloy at 1170 °C (a), 1200 °C (b), and 1230 °C (c).

Table 2 EDS analysis results for the typical microzones in Fig. 5.

Microzone	Composition (at. %)							Deduced phase
Microzone	Cu	Pd	V	Si	B	C	N	Deduced phase
1	0.32	0.29	43.93	2.99	0.22	18.02	34.23	V-(C,N)
2	0.24	0.22	46.81	0.18	/	29.06	23.49
3	0.35	0.31	45.72	1.07	1.10	29.14	22.31
4	0.28	0.20	51.82	0.31	/	33.38	14.01
5	0.28	0.69	42.71	0.12	4.84	40.57	10.79
6	0.05	0.07	42.32	0.12	5.67	39.59	12.18
7	62.42	19.92	1.14	1.41	6.91	5.47	2.73	Cu₃Pd
8	46.17	38.04	1.41	7.61	1.70	3.75	1.32	CuPd
9	39.08	34.50	5.10	6.13	7.43	4.81	2.95
10	39.78	34.21	1.58	6.37	8.82	5.48	3.76
11	33.54	45.25	0.41	6.50	5.24	5.40	3.66
12	3.29	3.32	41.08	0.39	1.21	34.69	16.02	V-(C,N)
13	3.67	3.62	43.51	0.29	2.03	35.62	11.26
14	0.49	2.34	38.05	0.34	5.02	35.67	18.09

Fig. 6. Elemental area distribution maps for Fig. 5(b): (a) Cu, (b) Pd, (c) V, (d) Si, (e) B, (f) C, and (g) N.

Fig. 7. XRD pattern of the fracture surface after bend test: (a) brazing temperature of 1170 °C, (b) brazing temperature of 1200 °C.

Fig. 8. Joint appearances for the three kinds of the joints brazed at 1170 °C (a), 1200 °C (b) and 1230 °C (c).

Fig. 9. Room-temperature strength of the joints brazed at different temperature.

Fig. 10. Fracture surface of the Cf/SiBCN joint brazed at 1200 °C (a), the magnification image for area S1 (b), the magnification image for area S2 (c).

Table 3 EDS analysis result for the typical microzones in Fig. 10.

Microzone	Composition (at. %)							Deduced phase
Microzone	Cu	Pd	V	Si	B	C	N	Deduced phase
1	31.25	20.99	22.04	3.52	3.49	8.46	10.26	CuPd/V-(C,N)
2	1.54	0.95	36.16	4.22	5.18	40.28	11.67	V-(C,N)

Fig. 11. Model of the crack propagation when subjected to the bend test.

Fig. 12. Effect of test temperature on three point bend strength of the Cf/SiBCN composite joint brazed at 1200 °C.

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