Joining of Cf/SiBCN composite with two Ni-based brazing fillers and interfacial reactions

doi:10.1016/j.jmst.2017.01.032

Abstract

Abstract:

C_f/SiBCN ceramic composite was joined using Ni-19Cr-10Si (BNi5) and Ni-33Cr-24Pd-3.5Si-0.5B filler alloys at 1170 °C for 10 min. Two kinds of Ni-based filler alloys exhibited good wettability on the C_f/SiBCN composite, with a contact angle of 13° and 4°, respectively. The microstructures of the brazed joints were investigated by electron-probe microanalysis (EPMA), and three-point bend test was conducted for the joints at room temperature. When being brazed with BNi5 filler alloy, no evident reaction layer was observed at the surface of the joined composite, and the joint microstructure was characterized by Ni₂Si matrix with scatteringly distributing mixture compounds of Cr₂₃C₆, Ni₂Si and CrB. While Ni-Cr-Pd(Si,B) brazing alloy was used, a Cr₂₃C₆ reaction layer with a thickness of 11 μm was formed at the surface of the base composite. In the central part of the brazed joint, the phases were composed of Ni(Cr,Si) solid solution and complex compounds including Pd₂Si, (Ni,Pd)₂Si and Ni-B. The strength of C_f/SiBCN joint brazed with BNi5 filler alloy was 62.9 MPa at room temperature, whereas that with Ni-Cr-Pd(Si,B) filler alloy was at the same level.

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

Li Wenwen, Chen Bo, Xiong Yi, Xiong Huaping, Cheng Yaoyong, Zou Wenjiang. Joining of C_f/SiBCN composite with two Ni-based brazing fillers and interfacial reactions[J]. J. Mater. Sci. Technol., 2017, 33(5): 487-491.

Figures/Tables 9

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Filler alloy	Composition (mass fraction, %)	Filler alloy form	Liquidus temperature (°C)	Contact angle (deg.)
BNi5	Ni-19Cr-10Si	Alloying powder (-150 mesh)	1135	13
Ni-Cr-Pd-(Si,B)	Ni-33Cr-24Pd-3.5Si-0.5B	Foil (Thickness: 80 μm)	1115	4

Filler alloy	Composition (mass fraction, %)	Filler alloy form	Liquidus temperature (°C)	Contact angle (deg.)
BNi5	Ni-19Cr-10Si	Alloying powder (-150 mesh)	1135	13
Ni-Cr-Pd-(Si,B)	Ni-33Cr-24Pd-3.5Si-0.5B	Foil (Thickness: 80 μm)	1115	4

Microzone	Concentration (at.%) ----------------------------						Deduced phase
	Ni	Cr	Si	B	C	N
1	57.96	1.72	22.46	9.21	8.65	/	Ni₂(Si,B)
2	52.87	2.21	19.23	13.32	11.80	0.57	Ni₂(Si,B)
3	25.05	34.41	11.78	13.17	15.58	/	Ni₂Si + CrB + (Cr-C)
4	2.77	59.36	0.55	/	37.31	/	Cr-C
5	4.37	43.91	8.25	/	38.38	5.09	Cr-C
6	0.69	52.42	0.27	1.03	45.11	0.48	Cr-C

Microzone	Concentration (at.%) ----------------------------						Deduced phase
	Ni	Cr	Si	B	C	N
1	57.96	1.72	22.46	9.21	8.65	/	Ni₂(Si,B)
2	52.87	2.21	19.23	13.32	11.80	0.57	Ni₂(Si,B)
3	25.05	34.41	11.78	13.17	15.58	/	Ni₂Si + CrB + (Cr-C)
4	2.77	59.36	0.55	/	37.31	/	Cr-C
5	4.37	43.91	8.25	/	38.38	5.09	Cr-C
6	0.69	52.42	0.27	1.03	45.11	0.48	Cr-C

Microzone	Concentration (at.%) ----------------------------							Deduced phase
	Ni	Cr	Pd	Si	B	C	N
1	2.50	63.82	/	0.41	6.41	26.86	/	Cr-C
2	1.63	63.37	0.06	0.06	2.30	32.58	/	Cr-C
3	4.61	54.61	/	0.72	14.00	26.06	/	(Cr-C) + CrB
4	59.21	15.07	6.22	7.64	4.30	7.56	/	Ni(Cr,Si)ss
5	41.99	2.53	20.08	21.61	10.26	2.83	0.70	(Ni,Pd)₂Si + (Ni-B)
6	9.50	1.00	46.25	24.31	8.99	8.76	1.20	Pd₂Si