Fig. 5. (A) The solid-state NMR spectrum of Al2O3 at different sintering temperatures. (B) XRD signals of the printed samples at different sintering temperatures. (C) Schematic of the polymer/Al composite. (D) Schematic of the Al particles in the sample after debinding. (E) Schematic of the Al particles after sintering. (F) Schematic of Al2O3 for the oxidation at a high temperature. (G) Schematic of the cross-section of the Al2O3/Al composite. (H) The EDX result of the sintered sample at different temperatures. Position 1 is the EDX result at the outer part of a particle, position 2 is the EDX result from 3 μm from the outer part of a particle, position 3 is the EDX result from 6 μm from the outer part of a particle.
