The influence of the microwave plasma nitrided Ti6Al4V substrate properties to the duplex coating performance
Titanium alloys, especially TI6Al4V has been used in many industries such as aerospace applications, medical application and automotive applications. This is because it has beneficial properties such as low density, high strength to weight ratio, low modulus elasticity, excellent corrosion resist...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en |
| Published: |
Trans Tech Publications
2014
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/14362/1/AMM.761.68-_Yusliza_IDECON_2014.pdf http://eprints.utem.edu.my/id/eprint/14362/ http://doi:10.4028/www.scientific.net/AMM.761.68 |
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| Summary: | Titanium alloys, especially TI6Al4V has been used in many industries such as aerospace
applications, medical application and automotive applications. This is because it has beneficial
properties such as low density, high strength to weight ratio, low modulus elasticity, excellent
corrosion resistance and etc. However, titanium and its alloys have limited use in mechanical
engineering applications involving sliding wear or abrasion due to poor wear resistance. Therefore,
the duplex coating concept was introduced with the intention of the surface modification process as a
pre-treatment of the substrate prior to the deposition of hardcoating process. In this study, plasma
nitriding of the Ti6Al4V was performed using a microwave plasma technique at 600°C and 700°C for
1 hour, 3 hours and 5 hours, then followed by deposition of chromium nitrate (CrN) on plasma
nitrided samples for duplex coating purposes. Microstructural analysis and mirohardness
measurement revealed that formation of Ti2N and TiN phase indicating the formation of the
compound layer was observed for substrate nitrided at temperature as low as 600oC for 1 hour and a
substantial increase on the case depth obtained on plasma nitrided Ti6Al4V was observed with an
increase of process temperature and time. The duplex coating obtained in this study has superior
surface hardness property and improved load carrying capacity of the coating – substrate system
compared to CrN coatings deposited on as received Ti6Al4V which was observed in the penetration
depth analysis. |
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