A novel Y3Si2C2 material was synthesized at a relatively low temperature(900℃)using a molten salt method for the first time,and subsequently used as the joining material for carbon fiber reinforced SiC(Cf/SiC)composites.The sound near-seamless joints with no obvious remaining interlayer were obtained at 1600℃using an electric field-assisted sintering technique(FAST).During joining,a liquid phase was formed by the eutectic reaction among Y3Si2C2,γ(Y-C)phase,and SiC,followed by the precipitation of SiC particles.The presence of the liquid promoted the sintering of newly formed SiC particles,leading to their complete consolidation with the Cf/SiC matrix.On the other hand,the excess of the liquid was pushed away from the joining area under the effect of a uniaxial pressure of 30 MPa,leading to the formation of the near-seamless joints.The highest shear strength(τ)of 17.2±2.9 MPa was obtained after being joined at 1600℃for 10 min.The failure of the joints occurred in the Cf/SiC matrix,indicating that the interface was stronger than that of the Cf/SiC matrix.The formation of a near-seamless joint minimizes the mismatch of thermal expansion coefficients and also irradiation-induced swelling,suggesting that the proposed joining strategy can be potentially applied to SiC-based ceramic matrix composites(CMCs)for extreme environmental applications.

Teng YU;Jie XU;Xiaobing ZHOU;Peter TATARKO;Yang LI;Zhengren HUANG;Qing HUANG

Engineering Laboratory of Advanced Energy Materials,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Institute of Inorganic Chemistry,Slovak Academy of Sciences,Dúbravská cesta 9,845 36 Bratislava,Slovakia;Centre of Excellence for Advanced Materials Application,Slovak Academy of Sciences,Dúbravská cesta 9,845 11 Bratislava,Slovakia;National Key Laboratory of Science and Technology on High-Strength Structural Materials,Central South University,Changsha 410083,China

先进陶瓷（英文版）

[1]Teng YU;Jie XU;Xiaobing ZHOU;Peter TATARKO;Yang LI;Zhengren HUANG;Qing HUANG-.Near-seamless joining of Cf/SiC composites using Y3Si2C2 via electric field-assisted sintering technique)[J].先进陶瓷（英文版）,2022(08):1196-1207

Y3Si2C2

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