Tungsten tetraboride, an inexpensive superhard material
Tungsten tetraboride, an inexpensive superhard material
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DOI：
10.1073/pnas.1102636108
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发表时间：
2011-07-05
影响因子：
11.1
通讯作者：
Kaner, Richard B.
中科院分区：
文献类型：
--
作者：
Mohammadi, Reza;Lech, Andrew T.;Kaner, Richard B.
四硼化钨（WB 4）是一个有趣的候选人作为一个较便宜的成员越来越多的超硬过渡金属硼化物。采用电弧熔炼法成功地合成了WB 4。利用粉末X射线衍射（XRD）和能量色散X射线光谱（EDX）的表征表明，所合成的材料是相纯的。通过高压X射线衍射测量的WB 4的零压体积模量为339 GPa。使用微压痕的机械测试在0.49 N的施加载荷下给出43.3 +/- 2.9 GPa的维氏硬度。在WB 4中加入各种比例的Al 2 O3以增加硬度。加入1at.% Re时，维氏硬度在0.49 N时增加到约50 GPa。含和不含1原子%的四硼化钨粉末Re添加物在空气中高达约400 ℃是热稳定的，如通过热重分析测量的。
Tungsten tetraboride (WB4) is an interesting candidate as a less expensive member of the growing group of superhard transition metal borides. WB4 was successfully synthesized by arc melting from the elements. Characterization using powder X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) indicates that the as-synthesized material is phase pure. The zero-pressure bulk modulus, as measured by high-pressure X-ray diffraction for WB4, is 339 GPa. Mechanical testing using microindentation gives a Vickers hardness of 43.3 +/- 2.9 GPa under an applied load of 0.49 N. Various ratios of rhenium were added to WB4 in an attempt to increase hardness. With the addition of 1 at.% Re, the Vickers hardness increased to approximately 50 GPa at 0.49 N. Powders of tungsten tetraboride with and without 1 at.% Re addition are thermally stable up to approximately 400 degrees C in air as measured by thermal gravimetric analysis.