J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (5): 487-491.DOI: 10.1016/j.jmst.2017.01.032
• Orginal Article • Previous Articles Next Articles
Li Wenwena, Chen Boa, Xiong Yib, Xiong Huapinga*(), Cheng Yaoyonga, Zou Wenjianga
Received:
2016-11-07
Revised:
2016-12-27
Accepted:
2017-01-12
Online:
2017-05-20
Published:
2017-05-17
Contact:
Xiong Huaping
About author:
These authors contributed equally to this work.
Li Wenwen, Chen Bo, Xiong Yi, Xiong Huaping, Cheng Yaoyong, Zou Wenjiang. Joining of Cf/SiBCN composite with two Ni-based brazing fillers and interfacial reactions[J]. J. Mater. Sci. Technol., 2017, 33(5): 487-491.
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 |
Table 1 Composition, liquidus temperature, and contact angle on Cf/SiBCN of two kinds of alloys (heating condition: 1170 °C/10 min).
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 |
Fig. 2. Back-scattered electron image of Cf/SiBCN joint brazed with BNi5 filler alloy (a), and area distribution maps of elements: Ni (b), Cr (c), Si (d), B (e), C (f), N (g).
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 |
Table 2 EDS analysis results for the microzones in Fig. 2(a).
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 |
Table 3 EDS analysis results for the microzones in Fig. 4.
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 |
Filler metal | Brazing parameters | Individual strength (MPa) | Average strength (MPa) |
---|---|---|---|
BNi5 | 1170 °C/10 min | 61.3 | 62.9 |
59.4 | |||
68.0 | |||
Ni-Cr-Pd(Si,B) | 48.8 | 61.4 | |
56.6 | |||
78.8 |
Table 4 Three-point bend strength of Cf/SiBCN joints brazed with two Ni-based filler metals.
Filler metal | Brazing parameters | Individual strength (MPa) | Average strength (MPa) |
---|---|---|---|
BNi5 | 1170 °C/10 min | 61.3 | 62.9 |
59.4 | |||
68.0 | |||
Ni-Cr-Pd(Si,B) | 48.8 | 61.4 | |
56.6 | |||
78.8 |
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