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A novel Si
3
N
4
fiber reinforced SiC matrix composite has been prepared and the micro-mechanical properties of the composites
in situ
have been explored. For the Si
3
N
4
fibers, the micro-mechanical properties
in situ
remained almost unchanged with the increasing fabrication temperatures. In comparison, for the PCS derived SiC matrix, higher fabrication temperature could trigger more β-SiC formations, which led to enlarging the corresponding micro-mechanical properties. The microstructure analysis of the interfacial zones in the composites revealed strong interfacial reactions existing in the composites fabricated at ≥800 °C. Therefore, the interfacial shear strength of the composite was significantly increased from ∼420 MPa to ∼535 MPa with the fabrication temperature increasing from 800 °C to 1200 °C, thus impeding the toughening mechanisms of the composites. After introducing BN interphase, the interfacial shear strength was significantly reduced to ∼140 MPa and the flexural strength was increased from ∼140 MPa to ∼250 MPa. The work highlights the efficiency of introducing BN interphase to weaken the interfacial interaction, thus to enhance the macro-mechanical properties.
A novel Si
3
N
4
fiber reinforced SiC matrix composite has been prepared and the micro-mechanical properties of the composites
in situ
have been explored.