Micro-arc oxidation for improving high-temperature oxidation resistance of additively manufacturing Ti2AlNb

Zhou，Y. H.1,5; Chen，P. H.1,2; Huang，D. N.1; Wu，Z. Z.3; Yang，T.4; Kai，J. J.5; Yan，M.1

2022-09-15

10.1016/j.surfcoat.2022.128719

SURFACE & COATINGS TECHNOLOGY   Impact Factor & Quartile

0257-8972

1879-3347

The poor formability and high-temperature oxidation resistance of Ti2AlNb-based intermetallics (for example, Ti-22Al-25Nb at. %, nominal composition) are considered to be the main obstacles that need to be overcome in critical high-temperature applications. In this study, micro-arc oxidation (MAO) was applied to Ti2AlNb additively manufactured by selective laser melting (SLM). SLM offered advanced forming capabilities, while MAO enhanced the mechanical and chemical properties of the materials. The MAO coating comprised an amorphous layer, a nanocrystalline oxide layer, and a continuous TiO2 layer. The multi-layers structure of MAO coating significantly improved the high-temperature oxidation resistance by blocking inward oxygen diffusion. The pulse frequency had significant effects on the microstructure, hardness, and wear resistance of the MAO coatings. Low pulse frequency led to thick MAO coatings with coarse surface roughness, large crater-like pores, and serious surface cracks. High pulse frequency improved the hardness and wear resistance of the MAO coatings. A pulse frequency of 1000 Hz deteriorated the wear resistance of MAO coating caused by the poor metallurgical bonding between the substrate and MAO coating. This study demonstrated the possibility of employing MAO to enhance the critical properties of the Ti2AlNb-based intermetallics fabricated by SLM.

Ti2AlNb Selective laser melting (SLM) Micro-arc oxidation (MAO) Multi-layer MAO coating High-temperature oxidation resistance

SCI ; EI

English

First ; Corresponding

Science and Technology Planning Project of Guangdong Province of China[2019B010943001] ; Natural Science Foundation of Guangdong Province[2020A1515011373] ; Shenzhen Science and Technology Innovation Commission[JCYJ20180504165824643] ; Central Guidance on Local: Construction of regional innovation system-Cross Regional R & D cooperation projects[20221ZDH04054] ; Guangdong Basic and Applied Basic Research Foundation[2019A1515011858]

Materials Science ; Physics

Materials Science, Coatings & Films ; Physics, Applied

WOS:000831119200001

ELSEVIER SCIENCE SA

20223012400615

3D printers ; Additives ; Aluminum alloys ; Chemical bonds ; Diffusion coatings ; Hardness ; High temperature applications ; Melting ; Nanocrystals ; Niobium alloys ; Oxidation resistance ; Surface roughness ; Ternary alloys ; Thermooxidation ; Titanium alloys ; Wear of materials ; Wear resistance

Metals Corrosion:539.1 ; Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Printing Equipment:745.1.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Inorganic Compounds:804.2 ; Coating Materials:813.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystalline Solids:933.1 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85134503857

Web of Science

1.Department of Materials Science and Engineering,Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Southern University of Science and Technology,Shenzhen,518055,China
2.College of Mechatronics and Control Engineering,Additive Manufacturing Institute,Shenzhen University,Shenzhen,518060,China
3.School of Advanced Materials,Peking University Shenzhen Graduate School,Shenzhen,518055,China
4.Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong
5.Department of Mechanical Engineering,City University of Hong Kong,Hong Kong

Zhou，Y. H.,Chen，P. H.,Huang，D. N.,et al. Micro-arc oxidation for improving high-temperature oxidation resistance of additively manufacturing Ti2AlNb[J]. SURFACE & COATINGS TECHNOLOGY,2022,445.

Zhou，Y. H..,Chen，P. H..,Huang，D. N..,Wu，Z. Z..,Yang，T..,...&Yan，M..(2022).Micro-arc oxidation for improving high-temperature oxidation resistance of additively manufacturing Ti2AlNb.SURFACE & COATINGS TECHNOLOGY,445.

Zhou，Y. H.,et al."Micro-arc oxidation for improving high-temperature oxidation resistance of additively manufacturing Ti2AlNb".SURFACE & COATINGS TECHNOLOGY 445(2022).