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The purpose of the present study is to prepare ZrB 2 -based nanocomposites with limited or no obvious grain growth. For ZrB 2  nanoparticles, the densification on-set temperature was about 1300°C, whereas the obvious grain growth on-set temperature for ZrB 2  nanoparticles was found to be about 1500°C. Therefore, there was a temperature “window” 1300–1500°C where ZrB 2  nanoparticles could be densified with limited or no grain growth. In this study, densification of ZrB 2 -based nanocomposite was finally realized by means of low-temperature hot-pressing at 1450°C for 60 min under a uniaxial pressure of 30 MPa using Cu as a sintering additive. After hot-pressing, the grain growth of ZrB 2  nanoparticles was greatly suppressed, and the average grain size for ZrB 2  was only 310 nm. The microstructure and mechanical properties were examined, and the flexural strength and fracture toughness were 472.8 ± 36.4 MPa and 12.4 ± 0.5 MPa · m 1/2 , respectively. We believe this paper can lay the foundation for the preparation of ZrB 2 -based nanocomposites.

Preparation of ZrB 2 -based nanocomposites with limited grain growth by means of low-temperature hot-pressing using Cu additive