Oxidation behavior of the TiAlN hard coating in the process of recycling coated hardmetal scrap.
Oxidation behavior of the TiAlN hard coating in the process of recycling coated hardmetal scrap.
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TiAlN硬质涂层在涂层硬质合金废料回收过程中的氧化行为
DOI：
10.1039/c8ra09013k
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发表时间：
2019-05-07
期刊：
影响因子：
3.9
通讯作者：
Xu, Yukun
中科院分区：
文献类型：
--
作者：
Kuang, Hai;Tan, Dunqiang;He, Wen;Yi, Zhiqiang;Yuan, Fan;Xu, Yukun
回收涂层硬质合金废料对钨资源的回收变得越来越重要。然而，这些材料中的涂层是最大的问题之一，尤其是含铝涂层。本研究对废弃的TiAlN涂层WC-Co硬质合金刀尖在900℃的空气中等温氧化，研究了氧化过程中的最终氧化物、相变和组织演变。0.15 mm以下的球磨粉末在180min内被完全氧化，最终的氧化物中有涂层。白色WO_3主要分布在氧化膜表面富含缺陷的区域。最终的氧化膜为三层结构，主要由WO_3集中的最外层、Al_2O_3集中的中间层和TiO_2集中的内层组成。这与一种新型TiAlN涂层硬质合金在抗氧化试验中出现的Al_2O_3/TiO_2双层氧化膜不同。这是由于硬质合金废料中的缺陷为元素扩散和挥发提供了一条快速的途径。因此，完全去除氧化铝是不可能的。最终的氧化膜为三层结构，由富WO_3的最外层、富Al_2O_3的中间层和富TiO_2的内层组成。
Recycling coated hardmetal scraps is becoming increasingly important for tungsten resource recovery. However, the coatings in these materials are one of the biggest problems, especially Al-containing coatings. In this study, discarded TiAlN-coated WC–Co hardmetal tool tips were isothermally oxidized at 900 °C in air, during which the final oxide, phase transition and microstructure evolution were investigated. Milled powders below 0.15 mm were completely oxidized in 180 min, and pieces of coatings were found in the final oxides. White WO3 was mainly distributed on defect-rich areas of oxide scale surfaces. Furthermore, the final oxide scale was triple-layered, mainly consisting of the WO3-concentrated outmost layer, the Al2O3-concentrated middle layer, and the TiO2-concentrated inner layer. It is different from the bi-layered Al2O3/TiO2 oxide scale that appeared for a new TiAlN-coated hardmetal during an oxidation resistance test. This was attributed to the defects in hardmetal scraps, which provided a fast pathway for element diffusion and volatilization of WO3. Consequently, it was impossible to remove Al2O3 completely. The final oxide scale was triple-layered, consisting of a WO3-rich outmost layer, Al2O3-concentrated middle layer and TiO2-concentrated inner layer.
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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
发表时间：
2018-09-21
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Kuang H;Tan D;He W;Yi Z;Zou Z;Wang X
通讯作者：
Wang X
影响因子：
4.7
作者：
Kim, Sunjung;Seo, Bosung;Son, Seong-Ho
通讯作者：
Son, Seong-Ho
影响因子：
4
作者：
Panjan, P;Navinsek, B;Zalar, A
通讯作者：
Zalar, A
影响因子：
5.4
作者：
Xiao, Baijun;Li, Haixu;Wang, Qimin
通讯作者：
Wang, Qimin
影响因子：
5.4
作者：
Grossmann, Birgit;Schalk, Nina;Mitterer, Christian
通讯作者：
Mitterer, Christian