Surface morphology and microstructure evolution of B4C ceramic hollow microspheres prepared by wet coating method on a pyrolysis substrate

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B4C hollow microspheres have been proposed as one of the promising ignition capsules for inertial confinement fusion (ICF). It is worth noting that the selection of easier-to-remove substrate materials is the key to obtaining B4C hollow microspheres. In this work, B4C core-shell microspheres with a uniform structure are prepared by the wet coating method on a PAMS substrate. After the calcination, the complete thermal decomposition of the PAMS substrate leads to a hollow structure B4C ceramic microsphere. The effects of solid content of coating slurry on the morphology and microstructure of the B4C core-shell microspheres were investigated in detail. The result shows that the spacing of the B4C particles in the slurry gradually decreases with increasing the solid content, resulting in an increase in the surface tension of the slurry and an improved stabilization, which helps to optimize the surface roughness and sphericity of the B4C microspheres.