Abstract
In this study, new data about the growth kinetics and indentation properties of cobalt boride layers formed on the surface of the ASTM F-75 biomedical alloy were estimated. The boron diffusion at the surface of the biomedical alloy was conducted using a powder-pack boriding process at temperatures of 1223-1273K with different exposure times for each temperature. Two mathematical approaches were proposed to determine the boron diffusion coefficients of the CoB and Co2B layers in the range of boriding temperatures, in which the experimental results of the kinetics of the cobalt boride layers were compared with those estimated using diffusion models.Finally, the mechanical characterization of the cobalt boride layers was evaluated by indentation techniques with applied loads of 0.98. N and 50. mN, respectively. According to the nanoindentation tests, a maximum hardness value (30. GPa) and a maximum Young's modulus (380. GPa) were obtained near the surface region (5. μm) of the borided cobalt alloy.
Original language | English |
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Pages (from-to) | 402-414 |
Number of pages | 13 |
Journal | Surface and Coatings Technology |
Volume | 237 |
DOIs | |
Publication status | Published - 25 Dec 2013 |
Funding
This work was supported by research grant 150556 of the National Council of Science and Technology , and research grant 20130534 of the Instituto Politécnico Nacional in Mexico .
Funders | Funder number |
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Instituto Politécnico Nacional in Mexico | |
Consejo Nacional de Ciencia y Tecnología | 20130534 |
Keywords
- Boriding
- Cobalt alloys
- Diffusion model
- Growth kinetics
- Hardness
- Young's modulus