In Situ Fabrication of B4C-NbB2 Eutectic Composites by Spark Plasma Sintering
In Situ Fabrication of B4C-NbB2 Eutectic Composites by Spark Plasma Sintering
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火花等离子烧结原位制备 B4C-NbB2 共晶复合材料
DOI：
10.1111/jace.13083
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Sakka
中科院分区：
文献类型：
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作者：
D. Demirskyi;Y. Sakka
本文首次报道了放电等离子烧结（SPS）原位合成/固结共晶复合材料的烧结、组织和性能。SPS涉及可用于定制共晶复合物的组成的许多处理参数。结果表明，压力可作为控制共晶形成的一种手段。通过改变压力、温度和成分，我们提出了一种工艺路线，该工艺路线导致原位形成由基体（B_4C和B_4C-NbB_2复合材料）和规则分布的NbB_2晶须组成的增强共晶复合材料。共晶成分为35 mol.%的复合材料SPS制备的NbB 2具有较高的维氏硬度（26-27 GPa）和压痕断裂韧性（~6 MPa·m1/2）。
This contribution reports, for the first time, the sintering, microstructure and properties ofin situsynthesized/consolidated eutectic composites by spark–plasma sintering (SPS). SPS involves a number of processing parameters that may be used to tailor the composition of eutectic composites. It was shown that pressure may be used as a means of controlling the eutectic formation. By changing the pressure, temperature and composition, we propose a processing route that results in thein situformation of strengthened eutectic composites, consisting of a matrix (B4C, and B4C–NbB2composite) and also containing regularly distributed whiskers of NbB2. The composites with the eutectic composition of 35 mol.% NbB2obtained by SPS exhibit a high Vickers hardness (26–27 GPa) and indentation fracture toughness (~6 MPa·m1/2).