Atomic diffusion induced degradation in bimetallic layer coated cemented tungsten carbide
Atomic diffusion induced degradation in bimetallic layer coated cemented tungsten carbide
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DOI：
10.1016/j.corsci.2017.01.007
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发表时间：
2016-06
影响因子：
8.3
通讯作者：
Zirong Peng;M. Rohwerder;P. Choi;B. Gault;Thorsten Meiners;M. Friedrichs;H. Kreilkamp;F. Klocke;D. Raabe
中科院分区：
文献类型：
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作者：
Zirong Peng;M. Rohwerder;P. Choi;B. Gault;Thorsten Meiners;M. Friedrichs;H. Kreilkamp;F. Klocke;D. Raabe
我们研究了玻璃模具的时间退化，由硬质合金涂层与PtIr的粘合剂铬或镍夹层，通过电子显微镜和原子探针断层扫描。在630 °C和1.12 × 10−23bar氧分压下的暴露处理过程中，发现Cr（Ni）通过PtIr中的晶界向外扩散，改变了表面形貌。在夹层溶解时，WC基底也开始降解。涂层中发生了PtIr、Cr（Ni）和WC的广泛互扩散过程，导致金属间化合物相和空洞的形成，降低了涂层的结合力。
We investigated the temporal degradation of glass moulding dies, made of cemented tungsten carbide coated with PtIr on an adhesive Cr or Ni interlayer, by electron microscopy and atom probe tomography. During the exposure treatments at 630 °C under an oxygen partial pressure of 1.12 × 10−23bar, Cr (Ni) was found to diffuse outwards via grain boundaries in the PtIr, altering the surface morphology. Upon dissolution of the interlayer, the WC substrate also started degrading. Extensive interdiffusion processes involving PtIr, Cr (Ni) and WC took place, leading to the formation of intermetallic phases and voids, deteriorating the adhesion of the coating.