WALAILAK JOURNAL OF SCIENCE AND TECHNOLOGY

Volume 18, No. 13, Month JULY, Year 2021, Pages -

Enhanced surface hardness of commercially pure titanium by pack carburization with rubberwood charcoal and rubberwood ash

Natthaphong KONKHUNTHOT, Patcharanut BURANAPIMA, Patipan BOONNITEE, Mahamasuhaimi MASAE, Peerawas KONGSONG

Abstract Download PDF

In the present work, pack carburization with rubberwood charcoal and rubberwood ash at 925 °C for 6, 12, and 24 h was carried out to improve the surface hardness of commercially pure titanium (CP-Ti). X-ray diffraction and energy dispersive spectrometer analyses revealed the formation of titanium carbide (TiC) and the existence of oxygen diffusion in the carburized surface. The surface hardness of most optimized conditions has remarkably increased by 481 % as compared to untreated CP-Ti (from 175 HV to 1016 HV) due to the TiC surface layer, while the hardened oxygen diffusion layer of about 300 μm in-depth, as clearly seen in the microhardness profiles is useful for increased load-bearing capacity. Consequently, pack carburization with rubberwood charcoal and rubberwood ash is a promising surface modification technique, which can significantly enhance the surface hardness and increase the load-bearing capacity of CP-Ti for biomedical and tribological applications.

Keywords

Pack carburization, Rubberwood charcoal and ash, Surface hardness, CP-Ti, TiC

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