xSi-BN/SiC纤维光电联用高通量表征OA

BN interphase serves as a key component of SiCf/SiC composite materials.Optimizing its composition and microstructure is essential for enhancing the comprehensive performance and reliability of ceramic matrix composites.In this investigation,we developed an optoelectric combination technology by combining scanning electron microscopy and laser scanning confocal microscopy through calibration and intelligent positioning,which can characterize the same area of the fiber at multiple scales.Key information,such as the surface roughness,micromorphology,and elemental distribution of BN interphase,was obtained.By establishing a unified planar coordinate system,it increased the measurement speed by about 1.1 times,and allowed high-throughput analysis of 20 component sample areas in one hour.The research indicates that the input flow rate of Si precursor increased during preparation,and the Si content in the xSi-BN interphase increased while the B content decreased.The introduction of Si leads to a decrease in the crystallinity of BN and an enhancement in its surface activity,thereby facilitating the absorption of oxygen from the air and the formation of protruding particles on the surface.Si doping significantly influences the layered structure and mechanical properties of BN.As the Si content reaches 8%,the"pop-in"phenomenon associated with interlayer sliding disappears,and the hardness of the x Si-BN interphase markedly decreases from 14.91 GPa to 8.06 GPa.When the Si content reaches 11%,the interfacial shear strength increases significantly from 32.76 MPa to 109.07 MPa.This technology provides an effective approach for the microstructural characterization of the compositional design,structural regulation,and performance optimization of the interphase in SiCf/SiC composites.The datasets in this article are listed in Science Data Bank at http://doi.org/10.57760/sciencedb.jim.00028.