The present work focuses on the development of Al/SiC materials manufactured by Laser Powder Bed Fusion (L-PBF). More specifically, our goal is to address the issue of the SiC dissolution kinetics, with the objective of preventing or at least limiting SiC decomposition into Al$_4$C$_3$ in melted aluminum. To do so, Al-SiC powder composites with SiC particles of various sizes, namely from circa 35 nm to 4.5 µm, using a standard AlSi$_7$Mg$_{0.6}$ alloy as host material are first successfully prepared, and these composite powders are printed in a standard L-PBF equipment. The resulting parts are then thoroughly characterized. An important result is that only the largest 4.5 µm particles can be partially preserved. These findings are consistent with the results of a diffusion based numerical model, which allows in addition to study the kinetics of powder dissolution as a function of thermophysical and process parameters. A general finding of the present work is that a thermodynamically unstable nanoparticle cannot survive the L-PBF process.