期刊
CERAMICS INTERNATIONAL
卷 41, 期 7, 页码 8273-8281出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.03.042
关键词
Films; Tungsten borides; SPS - sintering; Pulsed laser ablation/deposition
资金
- National Science Centre (NCN - Poland) [UMO-2012/05/D/ST8/03052]
Reactive spark plasma sintering (SPS) of WB2/WB3 ceramics from elements is studied; the sintering pressure dependence of the ratio of WB3 to WB2 in samples produced by SPS is discussed. Regardless of the sintering pressure, the obtained samples are very hard similar to 20 GPa. WB3 superhard films prepared by pulsed laser deposition (PLD) from selected SPS targets are presented. WB3 coatings were prepared on Si (100) substrates using a nanosecond, Nd:YAG laser operating at a 355 nm wavelength. The phase analysis, crystallography, and orientations have been studied using X-ray diffraction (XRD). A WB2 to WB3 phase transformation from 8.2% WB3 in a sintered target to 93.3% WB3 in a deposited film was observed. Additionally, the surface of a SPS sintered WE, target after the ablation process was examined. XRD studies show that already during the laser ablation there is a significant WB2 to WB3 phase transformation. Vickers hardness of sintered samples was measured in macro- and micro-scale, and PLD films in the nanoscale. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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