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All Journal Mekanika: Majalah Ilmiah Mekanika
Wijang Wisnu Raharjo
Department of Mechanical Engineering, Universitas Sebelas Maret, Surakarta, Indonesia

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Analisys of Tensile Strength, Wear Rate, and Cristallinity of Biocomposite Nano-HA/Magnesium/Shellac Reinforced Cantula Fiber for Bone Screw Material Dea Pawestry Utami; Joko Triyono; Wijang Wisnu Raharjo; Rachmad Imbang Tritjahjono
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i1.71127

Abstract

Accidents are a major cause of fractures in Indonesia. One of the treatments for fractures is bone screws with support plates that are placed on broken bone. Currently, many biomaterials for bone screws are being developed which have biodegradable properties so that post-operative bone healing is not required. The purpose of this study was to determine the effect of cantula fiber addition on tensile strength, wear rate, and crystallinity of nano-HA/magnesium/shellac bio-composite for bone screw materials. Nano-HA/magnesium/shellac/cantula fiber materials were mixed using a blender. The material was mixed with a magnesium/hydroxyapatite ratio of 70/30 and cantula fiber was added with variations of 0%, 10%, 20% and 30% of total volume. After that, material mixture was compacted with a pressure of 300 MPa for 10 minutes. Then sintering process was carried out at temperature of 140 °C for two hours. The results showed that the highest tensile strength value was 7.86 MPa at 30% variation. The lowest wear rate was 0.31 x 10-3 mm3/Nm at 30% variation. The highest crystallinity in X-Ray Diffraction observations was obtained at 30% variation, which was 79.65%.
Effect of Heating Temperature on Wear Rate, Tensile Strength, and Crystallinity of Cantula Fiber-Reinforced Magnesium/Hydroxyapatite/ Shellac for Bone Screw Material Zufar Maulana; Joko Triyono; Wijang Wisnu Raharjo
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 1 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i1.71171

Abstract

Bone screws are commonly used together with support plates to stabilize fractured bones. Conventional bone screws are typically made from metals such as stainless steel and titanium due to their superior mechanical properties. However, the use of permanent metallic implants often requires a secondary surgical procedure for removal after the bone has healed. Therefore, recent research has focused on developing biodegradable biomaterials that can gradually degrade within the body, eliminating the need for implant removal. This study investigated the effect of heating temperature on the tensile strength, wear rate, and crystallinity of a magnesium/nano-hydroxyapatite (nano-HA)/shellac/cantala fiber biocomposite. The composite materials were mixed using a blender with a volume ratio of magnesium/nano-HA–shellac/cantala fiber of 50/20/30 and then compacted at a pressure of 300 MPa for 10 minutes. Heat treatment was conducted at temperatures of 100 °C, 120 °C, 140 °C, and 160 °C for two hours. The results showed that the lowest wear rate (0.72 × 10⁻³ mm³/Nm), the highest tensile strength (6.58 MPa), and the highest crystallinity (74.15%) obtained from X-ray diffraction (XRD) analysis were all achieved at a heating temperature of 160 °C, indicating that higher heating temperatures improved the mechanical and structural properties of the biocomposite.
Co-Authors Dea Pawestry Utami Joko Triyono Joko Triyono Rachmad Imbang Tritjahjono Zufar Maulana