The Unexpected Formation of MB
<sub>2</sub>
Layers (M = Refractory Metal) on Metal Surfaces
作者:Wibke Friedhoff、Edgar Milke、Michael Binnewies
DOI:10.1002/ejic.201001064
日期:2011.8
The reactions between refractory metals (Ti, Zr, V, Nb, Ta, Mo, W) and BCl3 vapour at high temperatures have been studied. For this purpose, the metal wires were heated up by an electrical current in a BCl3 atmosphere for a couple of hours. Optical and X-ray diffraction methods were used to analyze the solid products, whereas mass spectrometry was used to study the gas phase composition. In the reactions
研究了难熔金属(Ti、Zr、V、Nb、Ta、Mo、W)与 BCl3 蒸气在高温下的反应。为此,金属线在 BCl3 气氛中通过电流加热几个小时。光学和 X 射线衍射方法用于分析固体产物,而质谱法用于研究气相组成。在与 Ti、Zr、V、Nb 和 Ta 的反应中,我们观察到在金属表面形成 MB2 层。钼与 MoB 反应形成,与钨完全没有反应。这与热力学预期相反。从热力学的角度讨论了涂层过程的机理。