Controllable distribution of reinforcements for reducing the strain energy in dissimilar ceramic/metal joints

• Published in: Journal of the European Ceramic Society 2021-02, Vol.41 (2), p.1076-1087
• Main Authors: Feng, Qinghua, Lin, Panpan, Lin, Tiesong, He, Peng, Liu, Yan, Long, Weimin, Li, Jian
• Format: Article
• Language: English
• Subjects: Controllable spatial distribution; Multi-layered joint architecture; Plastic deformation; Strain energy; Thermal expansion mismatch
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2020.09.030

•SiC Reinforcements are controlled to cluster together in the center of joint domain.•Controllable spatial distribution of SiC realizes multi-layer architecture of joint.•For ceramic/metal joint, multi-layer architecture relaxes strain energy in ceramic.•For ceramic/metal joint, drop of strain energy in ceramic increases shear strength. A novel design of a multi-layered joint architecture, characterized by the controllable spatial distribution of ceramic reinforcements, was obtained, when brazing ZrB2-SiC ceramics and Ti-6Al-4 V reinforced by TiB whiskers with AgCu filler. To induce SiC reinforcements to cluster together, within the center of the filler and especially away from the ZrB2-SiC, SiC was added into joint, in the form of a SiC interlayer featuring a 3D-bridged network structure with continuous micro-channels infiltrated by capillary force by liquid filler during brazing. Different SiC particles were connected together, by micro-bridges being not destroyed during brazing. The layer rich in SiC could reduce thermal expansion mismatch between different substrates, the AgCu next to the ZrB2-SiC could relax the strain energy by high plastic deformation. Compared to joint brazed with single AgCu, joint strain energy decreased from 10.8 × 10−6 J to 8.6 × 10−6 J, accordingly joint shear strength increased from ∼5.4 MPa to ∼41.2 MPa.