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High-strength SiC joints fabricated at a low-temperature of 1400°C using a novel low activation filler of Praseodymium |
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| Authors: | Jie Xu Peter Tatarko Lianghao Chen Xu Shan Qing Huang Xiaobing Zhou |
| Affiliation: | 1. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
Weihon Materials Technology Corporation, Ningbo, China;2. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia Centre of Excellence for Advanced Materials Application, Slovak Academy of Sciences, Bratislava, Slovakia;3. Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China |
| Abstract: | High-strength SiC joints were successfully obtained by electric current field-assisted sintering technique at a low temperature of 1400°C using a Pr coating (100 nm) as the initial joining filler. A Pr3Si2C2 transient phase was formed in situ by the interfacial reaction, while the eutectic reaction between Pr3Si2C2 and SiC at ～1150°C resulted in the formation of a liquid phase. The liquid phase promoted the atomic diffusion at the interface and improved consolidation of the newly precipitated nano-sized SiC with the SiC matrix. This led to the formation of partially seamless joints of SiC. When the thickness of the joining layer decreased from 1 to 100 nm, the content of the residual Pr-O phase at the interface decreased, while the bending strength of the joints increased. A sound SiC joint with a bending strength of 227 ± 12 MPa was obtained at such a low temperature as 1400°C when a 100 nm Pr coating was applied. |
| Keywords: | bending strength electric field-assisted sintering joining Pr3Si2C2 SiC |