29:T43a,

The objective of this study is to investigate the boriding behaviour of titanium implant materials on the basis of their crystalline structure and chemical composition. α-type Cp-Ti, α + β type Ti-6Al-4V and β-type Ti-45Nb alloys have been borided by the powder-pack boriding technique at temperatures between 850 and 1200°C. The X-ray diffraction, GDOES and SEM analysis demonstrated that boride layers on Cp-Ti and Ti-6Al-4V alloy mainly composed of TiB₂ and TiB phases, whereas Ti-45Nb alloy consists of the mixture of TiB₂.NbB₂ and TiB phases. Boride layers on Ti-45Nb alloy grew uniformly and the highest boride layer thickness of 72.1 μm was obtained on this alloy among the others. Activation energies of boron in monolithic layer of Cp-Ti and Ti-6Al-4V alloy were determined to be 214.5 and 231.8 kJ/mol, respectively. Activation energies in monolithic and total boride layers on Ti-45Nb were determined to be 228.5 and 145.8 kJ/mol, respectively.

2a:T543,

This study aims to compare the wear properties of borided biomedical-grade titanium alloys, namely Cp-Ti, Ti-6Al-4V and Ti-45Nb, from basic classes each possessing α, α+β and β crystalline structures, respectively. The work also focuses on identifying the wear mechanisms that occur during tribological testing. Wear tests were conducted on surface treated samples under conditions that yielded maximum thickness and hardness values. A pin-on-disk tribometer with reciprocating motion, using a WC-Co ball as the counterface, was employed for dry sliding wear tests. Wear resistance was evaluated through wear track measurements and weight loss methods. Morphological features, microstructure of tested surfaces and also the debris generated were also analysed. At loads up to 12 N, mild polishing wear with shallow scratches and no detectable weight loss was observed across all titanium alloys. The Ti-45Nb alloy exhibited the most severe wear at 17 N due to the thinner boride layer, higher surface roughness, lower hardness and adhesion strength, resulting in premature degradation. Above 17 N, signs of delamination, microcracks, and chipping appeared to some extent in Cp-Ti and Ti-6Al-4V alloys, primarily ascribed to fatigue wear. However, no weight loss was recorded across all tested loads, indicating superior wear resistance.

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Boriding behaviour of titanium alloys with different crystalline structures

Wear behaviour of borided α,α+β and β Titanium alloys

Search results

Boriding behaviour of titanium alloys with different crystalline structures

Wear behaviour of borided α,α+β and β Titanium alloys