Synthesis, microstructure and properties of MoAlB ceramics
Synthesis, microstructure and properties of MoAlB ceramics
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DOI：
10.1016/j.ceramint.2018.04.177
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发表时间：
2018-08
影响因子：
5.2
通讯作者：
Ludi Xu;O. Shi;Caiyun Liu;Degui Zhu;S. Grasso;Chunfeng Hu
中科院分区：
文献类型：
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作者：
Ludi Xu;O. Shi;Caiyun Liu;Degui Zhu;S. Grasso;Chunfeng Hu
以MoB和Al粉末为原料，摩尔比为1-1.6，在1100 ℃下合成了高纯度的MoAlB粉末。过量的Al有助于在合成过程中获得单相MoAlB。随后用盐酸蚀刻出过量的铝。在1600 °C和60 MPa的温度下进行热压，得到致密的MoAlB块体，相对密度高达96.7%。广泛的机械，热学和电学性质的分析在这里报告。电导率为2.91 ± 0.23 × 106S/m，导热系数为29.21 ± 0.01 W/m K，证实了金属的导电行为。 的挠曲强度456.4±19.1 MPa,维氏硬度的9.3 ±0.4 GPa,抗压强度为1620.2 ±85.6 MPa,和断裂韧性 4.3±0.1 MPa m1/2were比得上其他三元层状化合物(MAX阶段)。在高达1600 °C的抗氧化性研究中，钝化al2o3垢抑制了进一步的氧化，即使加热/冷却样品连续五个循环。
High purity MoAlB powder was synthesized at 1100 °C starting from MoB and Al powders with a molar ratio of 1–1.6. The excess of Al contributed to achieve a single phase MoAlB during the synthesis. Al excess was subsequently etched out using HCl. Dense MoAlB bulks were consolidated by hot pressing at 1600 °C under 60 MPa resulting in a relative density as high as 96.7%. Extensive analysis of mechanical, thermal and electrical properties is here reported. The electrical conductivity of 2.91 ± 0.23 × 106S/m, and thermal conductivity of 29.21 ± 0.01 W/m K confirmed a metallic conduction behavior. The flexural strength of 456.4 ± 19.1 MPa, Vickers hardness of 9.3 ± 0.4 GPa, compressive strength of 1620.2 ± 85.6 MPa, and fracture toughness of 4.3 ± 0.1 MPa m1/2were comparable with other ternary layered compounds (MAX phases). The oxidization resistance was investigated up to 1600 °C where a passivating Al2O3scale inhibited further oxidation even when heating/cooling the sample for five consecutive cycles.