Interfacial Microstructure and Properties of Si3N4 Ceramics/Cu/304 Stainless Steel Brazed by Ti40Zr25B0.2Cu Amorphous Solder
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Analysis of Interface Structure
3.2. Performance of Brazed Joints
3.3. Effects of Brazing Temperature on Mechanical Properties
3.4. Effects of Cu Foil Thickness on Mechanical Properties
3.5. Fracture Path of Joint
4. Conclusions
- (1)
- 304/Ti40Zr25B0.2Cu/Cu/Ti40Zr25B0.2Cu/Si3N4 ceramics were brazed by Ti40Zr25B0.2Cu amorphous solder. A good brazed joint was obtained and joint interface was continuous and dense.
- (2)
- The interface structure of the 304/Ti40Zr25B0.2Cu/Cu/Ti40Zr25B0.2Cu/Si3N4 ceramics joint might be 304/FeTi/Cu-Zr+Cu-Ti+Fe-Ti/Cu(s,s)/Cu-Zr+Cu-Ti+Fe-Ti/Ti-Si+Zr-Si/TiN/Si3N4 ceramics from left to right.
- (3)
- Joint strength at room temperature rapidly decreased with increasing brazing temperature. The performance of welded joints was improved significantly with increasing Cu foil layer thickness. With a brazing temperature of 1223 K and an intermediate Cu foil layer of welded joint of 1000 μm, the strength at room temperature reached a maximum of 90 MPa.
Author Contributions
Funding
Conflicts of Interest
References
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Project of Performance | Hot-Pressing Si3N4 Ceramics |
---|---|
Density (g/cm3) | 3.25–3.35 |
Hardness (HRA) | 92–94 |
Modulus of elasticity (GPa) | 304–330 |
Thermal expansion coefficient (10−6/K) | 3.2–3.5 |
Coefficient of thermal conductivity (J/(cm·s·K)) | 0.155–0.293 |
△H0298 (KJ/mol) | −749 |
Point | Si | Ti | Zr | Cu | Fe | Cr | Ni | Possible Phase |
---|---|---|---|---|---|---|---|---|
Ip | 1.25 | 28.86 | 3.01 | 3.73 | 46.51 | 9.58 | 7.06 | FeTi |
IIp | 34.68 | 54.42 | 9.54 | 0.72 | 0.37 | 0.27 | - | TiN, Ti-Si |
a | - | 1.95 | 22.88 | 70.17 | 0.86 | 0.24 | 3.90 | CuZr2 |
b | - | 0.92 | - | 98.96 | 0.12 | - | - | Cu(s,s) |
c | 0.68 | 45 | 2.84 | 12.68 | 24.4 | 5.53 | 8.88 | Fe-Ti, Cu-Ti |
d | - | 26.67 | 2.42 | 48.14 | 2.09 | - | - | Cu-Ti |
e | 0.04 | 32.56 | 1.18 | 64.44 | 1.62 | 0.18 | - | Cu-Ti |
f | 0.02 | 6.04 | 21.77 | 71.65 | 0.52 | - | - | CuZr2 |
g | 2.17 | 60.66 | 2.15 | 21.63 | 12.06 | 1.33 | - | Fe-Ti, Cu-Ti |
h | 0.06 | 0.06 | - | 99.78 | - | 0.09 | - | Cu(s,s) |
Brazing Temperature T (K) | Thickness of Cu Foil (μm) | Room-Temperature Strength (MPa) |
---|---|---|
1223 | 500 | 76 |
700 | 82 | |
850 | 85 | |
1000 | 90 | |
1243 | 500 | 79 |
1273 | 500 | 24 |
1303 | 500 | 19 |
1323 | 500 | 16 |
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Xu, X.; Wang, Y.; Zou, J.; Xia, C. Interfacial Microstructure and Properties of Si3N4 Ceramics/Cu/304 Stainless Steel Brazed by Ti40Zr25B0.2Cu Amorphous Solder. Materials 2018, 11, 2226. https://doi.org/10.3390/ma11112226
Xu X, Wang Y, Zou J, Xia C. Interfacial Microstructure and Properties of Si3N4 Ceramics/Cu/304 Stainless Steel Brazed by Ti40Zr25B0.2Cu Amorphous Solder. Materials. 2018; 11(11):2226. https://doi.org/10.3390/ma11112226
Chicago/Turabian StyleXu, Xiangping, Yi Wang, Jiasheng Zou, and Chunzhi Xia. 2018. "Interfacial Microstructure and Properties of Si3N4 Ceramics/Cu/304 Stainless Steel Brazed by Ti40Zr25B0.2Cu Amorphous Solder" Materials 11, no. 11: 2226. https://doi.org/10.3390/ma11112226