STUDY ON MICROSTRUCTURE, MECHANICAL, AND CORROSION PROPERTIES OF B-ADDED CO-CR-W-NI-MN ALLOYS FOR HEART VALVE IMPLANT APPLICATIONS
Co-based metal alloys are future biomaterials for heart valve implant applications due to their excellent biocompatibility, mechanical, and corrosion properties. The CoCrWNiMn alloys, one of cobalt-based alloys, is currently being researched as a biomaterial. Boron has long been used as an alloyi...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/71615 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Co-based metal alloys are future biomaterials for heart valve implant applications
due to their excellent biocompatibility, mechanical, and corrosion properties. The
CoCrWNiMn alloys, one of cobalt-based alloys, is currently being researched as a
biomaterial. Boron has long been used as an alloying element which is added in
certain amounts to several alloys. In this study, boron was used as an alloying
element in the CoCrWNiMn alloys to modifying its mechanical and corrosion
properties.
The CoCrWNiMn alloys was prepared from cobalt, chrome, wolfram, nickel,
mangan, and boron chunk metals using vacuum arc remelting under Argon
atmosphere. The Vacuum Arc Remelting (VAR) process for each sample was
carried out 6 times by back and forth to obtain a uniformity distribution of elements
in each part. The microstructure, mechanical, and corrosion properties of the
CoCrWNiMn-×B alloys were analyzed. This analysis included optical microscopy
observations, SEM-EDS mapping observations, OES, XRD, hardness test, tensile
test, density test and corrosion performances of CoCrWNiMn-×B alloys in Hanks'
solution.
The results showed that boron addition up to 0.8 wt% in the CoCrWNiMn alloys
did not change phases significantly, but led precipitates at grain boundaries on the
sample morphology. Hardness and tensile strength properties of the CoCrWNiMn
alloy increased with boron addition. CoCrWNiMn alloys with 0.8 wt% boron
addition produced the highest hardness and yield strength values in 32.74 HRC and
439.27 MPa. The corrosion performances of the CoCrWNiMn alloys in Hanks'
solution decreased with boron addition. In-vivo corrosion results showed that the
CoCrWNiMn alloys with 0.8 wt% boron addition had the highest electrical
resistance, which leads a decrease in the corrosion rate. |
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