Abstract

Bone metal implants are currently made from stainless steel or titanium alloy. A stainless steel and titanium alloy implants lead to stress shielding effect as a result of the stiffness and density gap between human bone and the implant. Stress shielding causes a reduction in bone density or osteopenia. It commonly occurs on femur bone attached with stainless steel or titanium implant because the materials have much higher density and elastic modulus compare to human bone. Biodegradable magnesium alloy becomes a new candidate for bone implant material. Biodegradable magnesium alloy based implant is expected to replace stainless steel and titanium alloy implant, due to its advantages in degradation and absorption by the human body along with the new bone growth. The application of biodegradable magnesium alloy based implants can reduce or even avoid the stress shielding effect. Although magnesium has a similar density with human bone, the compressive strength of magnesium is lower than human bone, the human bone compressive strength is 130-180 MPa while magnesium is only 60-100 MPa. Compressive strength is an important mechanical property for bone implant application because almost all of the human bone has a compressive load. In this research, to improve mechanical properties especially the compressive strength, iron and calcium were added to make Mg-Fe-Ca alloy. The composition of the alloy is 99%wt Mg-0.2%wt Fe-0.8%wt Ca. The alloy was melted in a tubular furnace at a temperature of 900°C for 7 hours under a 99%wt Ar protective gas atmosphere. After that, the heat treatment was carried out at a temperature of 500°C for 2, 3, and 4 hours holding time then followed by rapid cooling using water quench. Compressive strength for the Mg-0,2Fe-0,8Ca alloy as cast is 165.6MPa, the compressive strength is increased along with the increase of holding time. The highest compressive strength achieved from the heat treatment process is 209.7MPa.

Original languageEnglish
Title of host publicationInternational Conference on Science and Applied Science, ICSAS 2019
EditorsA. Suparmi, Dewanta Arya Nugraha
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735419537
DOIs
Publication statusPublished - 27 Dec 2019
EventInternational Conference on Science and Applied Science 2019, ICSAS 2019 - Surakarta, Indonesia
Duration: 20 Jul 2019 → …

Publication series

NameAIP Conference Proceedings
Volume2202
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference on Science and Applied Science 2019, ICSAS 2019
Country/TerritoryIndonesia
CitySurakarta
Period20/07/19 → …

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