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The effect of the addition of Cr3+/Nd3+ doped Al2O3 nanoparticles (Al2O3  co-doped with 1% Cr3+ and 1% Nd3+ ions) on the mechanical and luminescent  properties of ZrB2 ceramic composites was investigated. ZrB2 based  composites with addition of 8, 16 and 32wt.% of alumina nanoparticles were  prepared by spark plasma sintering (SPS). Microstructure characteristics  were studied by scanning electron microscopy (SEM), elastic modulus by  ultrasonic wave transition method, hardness and fracture toughness by the  Vickers indentation methods. The addition of alumina nanoparticles had  positive effect on the mechanical properties of the composites. Thus, the  hardness increased from 14.5 to 16.2GPa and the fracture toughness from 3.91  to 5.89MPa•m1/2 in comparison to the values of the monolithic ZrB2 system.  The composite with the highest additive content showed evident luminescent  character and the increase of the temperature caused a reduction of  luminescent intensity. This is the first report which shows luminescent  properties of ZrB2 composites. Moreover, for the first time, luminescent  properties of Cr3+ ions were used to develop ZrB2 matrix composites with  Cr3+/Nd3+ doped Al2O3 particles with the self-temperature readout  functionality via luminescent thermometry.

ZrB2 matrix composites with Cr3+/Nd3+ doped Al2O3 luminescent nanoparticles for non-contact temperature sensing