Deep Densification of ZrB2 by Hot Pressing
Abstract
ZrB2 powder was prepared by ZrO2, H3BO3 and C as raw materials and boron (B) as additive. The powder was subjected to deep densification study by hot pressing sintering. The powder and the crystal structure were determined by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS), and transmission electron microscopy (TEM) with selective area electron diffraction (SAED). The results show that the product was a ZrB2 single phase powder by carbothermal reduction method with regular morphology. The average particle size was 3–4 μm. The crystal structure of the powder was complete and no obvious lattice defect was obtained. The hot-pressing sintered product is a ZrB2 single phase ceramic target. By introducing a certain amount of M-type ZrB2 powder, the deep densification ZrB2 ceramic target can be obtained with a relative density of 99.9%.
Keywords
Zirconium boride Carbothermal reduction Additive Hot pressing sintering DensificationReferences
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