Abstract
In this study, Si3N4 ceramics combined with the Si3N4-Li2O-Y2O3 system were joined by spark plasma sintering (SPS) at 30 MPa in N2 atmosphere. The effects of the joining temperature (1300–1600 ℃) on the phase composition, microstructure, and mechanical properties of the joints were investigated. With joining temperature increasing, the interlayer became thinner and denser, and, thus, the shear strength increased gradually. The average shear strength of the joint produced at 1600 ℃ was measured to be 136.3 ± 2.4 MPa and the content of the β-Si3N4 phase was estimated to be 42 wt%. The main phases present in the interlayer were α-Si3N4 and β-Si3N4 and the thickness of the interlayer was about 12 μm. The Si3N4-Li2O-Y2O3 slurry applied by air spray method could achieve a dense interlayer with similar composition to the matrix and high-strength Si3N4 joint, which could have the potential to be used in extreme environment.
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