Abstract
Achieving high-temperature-resistant and high-strength connections of silicon carbide ceramics in an oxidizing atmosphere without pressure is an urgent challenge. A composite adhesive was innovatively designed using the polysiloxane as matrix and B4C, nano-silicon and LSAM glass-ceramics as fillers. The introduction of LSAM glass-ceramics enabled an excellent matching of the thermal expansion between the adhesive and the SiC. A strong interfacial bonding was formed at the bonded interface due to the dissolution-diffusion of Mg2+, Li+, [SiO4] and [AlO4]. Moreover, the SiC nanowires grown in-situ inside the adhesive effectively repaired the defects caused by the pyrolysis of adhesive matrix, substantially enhancing the high-temperature mechanical properties of the SiC joints. After the heat treatment at 1400 °C, the SiC joints bonded using the adhesive showed a room temperature shear strength of 97.2 MPa and a high temperature shear strength of 81.6 MPa at 1300 °C, providing a significant advantage over existing works.
Published Version
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