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Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap

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/Al(2)O(3)/TiN hard coating in the recycling process was investigated. The oxidation rate slowed down a...

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Autores principales: Kuang, Hai, Tan, Dunqiang, He, Wen, Yi, Zhiqiang, Zou, Zhihang, Wang, Xiaoru
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6212971/
https://www.ncbi.nlm.nih.gov/pubmed/30248935
http://dx.doi.org/10.3390/ma11101796
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author Kuang, Hai
Tan, Dunqiang
He, Wen
Yi, Zhiqiang
Zou, Zhihang
Wang, Xiaoru
author_facet Kuang, Hai
Tan, Dunqiang
He, Wen
Yi, Zhiqiang
Zou, Zhihang
Wang, Xiaoru
author_sort Kuang, Hai
collection PubMed
description 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/Al(2)O(3)/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 TiO(2) scale, while the Al(2)O(3) phase remained and the dense Al(2)O(3) layer acted as a barrier for its good oxidation resistance. Pieces of the Al(2)O(3) 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.
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spelling pubmed-62129712018-11-14 Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap Kuang, Hai Tan, Dunqiang He, Wen Yi, Zhiqiang Zou, Zhihang Wang, Xiaoru Materials (Basel) Article 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/Al(2)O(3)/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 TiO(2) scale, while the Al(2)O(3) phase remained and the dense Al(2)O(3) layer acted as a barrier for its good oxidation resistance. Pieces of the Al(2)O(3) 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. MDPI 2018-09-21 /pmc/articles/PMC6212971/ /pubmed/30248935 http://dx.doi.org/10.3390/ma11101796 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kuang, Hai
Tan, Dunqiang
He, Wen
Yi, Zhiqiang
Zou, Zhihang
Wang, Xiaoru
Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap
title Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap
title_full Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap
title_fullStr Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap
title_full_unstemmed Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap
title_short Oxidation Behavior of Multilayer Hard Coatings (TiCN/Al(2)O(3)/TiN) in Process of Recycling Coated Multicomponent Hardmetal Scrap
title_sort oxidation behavior of multilayer hard coatings (ticn/al(2)o(3)/tin) in process of recycling coated multicomponent hardmetal scrap
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6212971/
https://www.ncbi.nlm.nih.gov/pubmed/30248935
http://dx.doi.org/10.3390/ma11101796
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