Ultrahigh-pressure densification of nanocrystalline WB ceramics
Ultrahigh-pressure densification of nanocrystalline WB ceramics
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DOI：
10.1557/jmr.2010.0082
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发表时间：
2010-04
影响因子：
2.7
通讯作者：
Ying Chen;D. He;J. Qin;Zili Kou;Shanmin Wang;Jianghua Wang
中科院分区：
文献类型：
--
作者：
Ying Chen;D. He;J. Qin;Zili Kou;Shanmin Wang;Jianghua Wang
在1.0 ~ 3.0 GPa的超高压和700 ~ 1000℃的高温（UHPHT）下热压60 min。UHPHT样品的粒径为15 ~ 40 nm。我们的实验观察表明，超高压可以提高致密化，WB样品的密度可以达到理论密度的99.4%。在环境压力和550 ~ 1100℃温度下进行的60 min对比实验表明，外压有利于相纯、高密度WB的形成。此外，UHPHT样品的硬度值高达28.9±0.8 GPa。
Phase-pure nanostructured WB ceramics are hot pressed at ultrahigh pressures of 1.0 to 3.0 GPa and high temperatures of 700 to 1000 °C (UHPHT) for 60 min. The UHPHT samples are nanograin size from 15 to 40 nm. Our experimental observation shows that ultrahigh pressure could improve densification, and the density of WB samples could reach 99.4% of theoretical. The comparative experiments carried out at ambient pressure and temperatures of 550 to 1100 °C for 60 min indicate that the external pressure was favorable for phase-pure and highly dense WB formation. In addition, the UHPHT samples give a high hardness value of 28.9 ± 0.8 GPa.