Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898580 | Journal of the European Ceramic Society | 2018 | 11 Pages |
Abstract
The Ti22Si78 (wt.%) braze was used to bond porous BN/Si3N4 ceramic. The results revealed that the joint strength was low. In order to improve the joint strength, a carbon coated modification of the porous BN/Si3N4 substrate, achieved by the pyrolysis of phenol-formaldehyde resin was suggested. The thickness of carbon layer was controlled by the volume ratio of phenol-formaldehyde resin and methyl alcohol (R/M). The effect of the carbon layer on the microstructure and mechanical properties of the joint was examined. It was established that the maximum joint strength was achieved at the level of 80Â MPa (as opposed to the uncoated joint with only 30Â MPa) when R/M was 1:2, at the given brazing temperature. The improvement of the joint strength is attributed mainly to the formation of a SiC infiltration reaction layer, a significant population of SiC nanowires, as well as TiN0.7C0.3 and TiB2 particles.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Y.L. Zhuang, T.S. Lin, S.J. Wang, P. He, D.P. Sekulic, D.C. Jia,