首页> 外文会议>Institute of Physics Electron Microscopy and Analysis Group Conference, Sep 5-7, 2001, Dundee >Transmission microscopy investigation of the oxidation of hard coatings for high speed machine tools
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Transmission microscopy investigation of the oxidation of hard coatings for high speed machine tools

机译:透射显微镜对高速机床硬质涂层氧化的研究

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The oxidation of TiAlN based nitride hard coatings on steel substrates has been investigated as a function of time and temperature. The addition of Y during deposition changed the normal columnar growth into a fine interrupted columnar growth. XTEM examination revealed changes in the chemical composition of samples heat treated in air at 900℃. Moreover, in the Y-containing coating, grain growth due to the heat treatment was observed. FEG-STEM EDX analysis and elemental mapping showed that the nitride grain boundaries provided paths for substrate elements to diffuse rapidly to the surface. Y greatly inhibited such diffusion, probably by segregating to boundaries. At high temperatures Y diffused towards the surface to form discrete Y-rich particles within a layered polycrystalline structure of Al_2O_3, TiO_2 and Cr_2O_3.
机译:已经研究了随时间和温度变化对钢基底上的TiAlN基氮化物硬质涂层的氧化作用。沉积过程中添加的Y将正常的柱状生长转变为精细的中断的柱状生长。 XTEM检查发现在900℃空气中热处理的样品的化学成分发生了变化。此外,在含Y的涂层中,观察到由于热处理引起的晶粒生长。 FEG-STEM EDX分析和元素映射显示,氮化物晶界为基材元素快速扩散到表面提供了路径。 Y可能通过隔离到边界极大地抑制了这种扩散。在高温下,Y向表面扩散,在Al_2O_3,TiO_2和Cr_2O_3的层状多晶结构内形成离散的富Y粒子。

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