Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al₂O₃/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap.
Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al₂O₃/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap.
复制标题
多层硬质涂层（TiCN/Al2O3/TiN）在涂层多元硬质合金废料回收过程中的氧化行为
DOI：
10.3390/ma11101796
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发表时间：
2018-09-21
期刊：
影响因子：
--
通讯作者：
Wang X
中科院分区：
文献类型：
--
作者：
Kuang H;Tan D;He W;Yi Z;Zou Z;Wang X
涂层是回收涂层多元硬质合金废料的最大问题之一。研究了具有TiCN/Al 2 O3/TiN硬质涂层的WC-Co多元硬质合金刀片在回收过程中的等温氧化行为。由于保护层阻挡了元素扩散，氧化速率减慢。当它们被研磨成粉末并在900 °C下等温氧化时，获得了快速的氧化速率。缺陷为元素扩散提供了一条快速通道，应力、膨胀和气体挥发促进了缺陷的扩散。TiN和TiCN层都被氧化成多孔的TiO 2层，而Al 2 O3相保留，并且致密的Al 2 O3层作为其良好抗氧化性的屏障。在最终的氧化物中可以明显地看到Al 2 O3层的碎片。这为减少涂层的负面影响和提高回收WC粉末和硬质合金的性能提供了关键信息。
The coating is one of the biggest problems in the recycling of coated multicomponent hardmetal scraps. The isothermal oxidation behavior of WC-Co multicomponent cemented carbide inserts with a TiCN/Al2O3/TiN hard coating in the recycling process was investigated. The oxidation rate slowed down as the protective coating blocked element diffusion. A rapid oxidation rate was obtained when they were milled into powders and isothermally oxidized at 900 °C. A rapid path for element diffusion was provided by the defects, which were promoted by stress, expansion, and gas volatilization. Both the TiN and TiCN layers were oxidized to a porous TiO2 scale, while the Al2O3 phase remained and the dense Al2O3 layer acted as a barrier for its good oxidation resistance. Pieces of the Al2O3 layer were obviously seen in the final oxides. This provides critical information to reduce the negative effect of coatings and improve the performance of recycled WC powders and hard alloys.