Laser nitriding and fusion of bonding porcelain coating on Ti surface

Publication date: 10 March 2019Source: Journal of Alloys and Compounds, Volume 777Author(s): Wenhao Wang, Beijing Xue, Litong Guo, Yu Fan, Baoe Li, Yihan Ling, Yinghuai QiangAbstractThe titanium surface was laser-nitrided to form a TiN intermediate layer and then a bonding porcelain layer was laser fused on it. The specimens were studied by XRD, FE-SEM and EDS tests. A porous titanium nitride layer about 20 μm was synthesized on Ti surface, and the main phases of which were c-TiN and TiN0.3. The Vickers hardness of the TiN layer was 618.68 HV, which is about 3 times of the titanium (202.9 HV). The EDS results showed the TiN layer prepared at 300W was a non-stoichiometri compound with mole ratio of Ti to N about 1:0.621. The porcelain coating laser fused on the TiN layer inherited the columnar structure of TiN, which had a rhombus-like intersecting surface. The highest scratching bonding strength (193.21 ± 23.33 MPa) between TiN layer and Ti was obtained at nitriding power of 300W. The porcelain coating laser fused on the TiN layer inherited the columnar structure of TiN, which had a rhombus-like intersecting surface. The bonding strength between coating and titanium (67.28 MPa) were much higher than the regular bonding strength between the porcelain and Ti (only about 35–40 MPa), which could be ascribed to the good chemical reactivity and wettability between the TiN layer and porcelain.

Source: Journal of Alloys and Compounds - November 9, 2018 Category: Chemistry Source Type: research