Synthesis, Microstructure and Mechanical Properties of ZrB2 ceramic Prepared by Mechanical Alloying and Spark Plasma Sintering

CHUN FENG HU; YOSHIO SAKKA; TETSUO UCHIKOSHI; TOHRU S. SUZUKI; BYUNG-KOOG JANG; SALVATORE GRASSO; GUSTAVO SUÁREZ

KEY ENGINEERING MATERIALS

Trans Tech publications

Lugar: Suiza; Año: 2010 vol. 434 p. 165 - 168

1013-9826

Abstract. Dense bulk ZrB2 ceramic was synthesized by mechanical alloying (MA) and followed spark plasma sintering (SPS) using zirconium and boron as initial materials. It was found that MA process was effective to fragment the coarse metal zirconium particles from 45 micron to less than 1 micron within 20 hours. In comparison with the commercial ZrB2 powder, the as-obtained zirconium and boron mixture powders showed higher sinterability. When the sintering was carried out at 1800oC, the relative density of synthesized ZrB2 samples using mixture powder was above 95%, higher than that of ZrB2 sample prepared using commercial powder (73%). Vickers hardness of those ZrB2 samples was at the same level of 15 GPa. However, the fracture toughness of ZrB2 samples seemed to depend on the heating rate of the SPS process. Corresponding to the heating rates of 10, 50, and 100oC/min, the fracture toughness of as-prepared ZrB2 samples were 3.83, 3.19, and 2.74 MPa·m1/2, respectively.