Machining the Surface of Orthopedic Stent Wire Using a Non-Toxic Abrasive Compound in a Magnetic Abrasive Finishing Process

• Published in: Applied Sciences
• Main Authors: Jeong Su Kim, Lida Heng, Sieb Chanchamnan, Sang Don Mun
• Format: Article
• Language: English
• Published: MDPI AG 2021-08-01
• Subjects: orthopedic stent wire; magnetic abrasive finishing; non-toxic abrasive; cold cream; surface roughness
• Online Access: https://www.mdpi.com/2076-3417/11/16/7267

The orthopedic stent wire is one of the critical medical components, which is mainly used for the replacement of physically damaged parts in the human body. Therefore, a smooth surface and lack of toxic substances on the surface of this component are highly demanded. In this study, a magnetic abrasive finishing (MAF) process was carried out using a non-toxic abrasive compound (a mixture of iron powder, diamond particles, cold cream, and eco-friendly oils) to achieve high-quality surface finishing of orthopedic stent wire. The surface roughness (Ra) of the stent wire was investigated according to various processing parameters: different rotational speeds (500, 1000, and 2000 rpm), diamond particle sizes (1.0 µm), and three eco-friendly oils (olive oil: C₉₈H₁₈₄O₁₀; grapeseed oil: C₁₈H₃₂O₂; and castor oil: C₅₇H₁₀₄O₉) within 300 s of the finishing time. The results showed that the surface roughness of the wire was reduced to 0.04 µm with a rotation speed of 1000 rpm and a diamond particle size of 1 µm when using grapeseed oil. SEM microimages and EDS analysis showed that the MAF process using a non-toxic abrasive compound could improve the surface quality of orthopedic Ni-Ti stent wire with a lack of toxic substances on the surface finish.