TY - CHAP

T1 - Powder metallurgical synthesis of biodegradable mg-hydroxyapatite composites for biomedical applications

AU - Stüpp, César Augusto

AU - Mendis, Chamini Lakshi

AU - Mohedano, Marta

AU - Szakács, Gábor

AU - Gensch, Felix

AU - Müller, Sören

AU - Feyerabend, Frank

AU - Hotza, Dachamir

AU - Fredel, Marcio Celso

AU - Hort, Norbert

N1 - Conference code: 7

PY - 2015

Y1 - 2015

N2 - Biodegradable Mg alloys are a new class of temporary implant materials for musculo-skeletal surgery. Recent studies show that Mg-based alloys can be biocompatible and there is a high demand to design Mg alloys with adjustable corrosion rates and suitable mechanical properties. An approach to solving this challenge might be the use of Mg metal matrix composites (Mg-MMC). In this study, a Mg-MMC composed of ZK60 was investigated as the base material and hydroxyapatite (HA) particles were added for tailoring its properties. The composite was produced by high-energy ball milling followed by hot extrusion. The HA particles were homogeneously distributed in the ZK60 matrix after ball milling and the composite was consolidated by hot extrusion. This work presents the influence of different amounts of HA on corrosion behaviour and mechanical properties of the composite. Corrosion properties were evaluated by immersion and electrochemical measurements in physiological media at 37 °C. A slight improvement in the corrosion resistance was observed for Mg-MMC most likely due to the presence of more stable corrosion products. Compression tests were used to measure the mechanical properties. Under compression, samples showed a slight increase in the compressive yield strength with the addition of HA, while the ultimate strength did not change significantly.

AB - Biodegradable Mg alloys are a new class of temporary implant materials for musculo-skeletal surgery. Recent studies show that Mg-based alloys can be biocompatible and there is a high demand to design Mg alloys with adjustable corrosion rates and suitable mechanical properties. An approach to solving this challenge might be the use of Mg metal matrix composites (Mg-MMC). In this study, a Mg-MMC composed of ZK60 was investigated as the base material and hydroxyapatite (HA) particles were added for tailoring its properties. The composite was produced by high-energy ball milling followed by hot extrusion. The HA particles were homogeneously distributed in the ZK60 matrix after ball milling and the composite was consolidated by hot extrusion. This work presents the influence of different amounts of HA on corrosion behaviour and mechanical properties of the composite. Corrosion properties were evaluated by immersion and electrochemical measurements in physiological media at 37 °C. A slight improvement in the corrosion resistance was observed for Mg-MMC most likely due to the presence of more stable corrosion products. Compression tests were used to measure the mechanical properties. Under compression, samples showed a slight increase in the compressive yield strength with the addition of HA, while the ultimate strength did not change significantly.

KW - Corrosion behaviour

KW - Hydroxyapatite

KW - Mechanical properties

KW - Mg-MMC

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=84954492491&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/MSF.828-829.165

DO - 10.4028/www.scientific.net/MSF.828-829.165

M3 - Article in conference proceedings

AN - SCOPUS:84954492491

SN - 9783038355625

T3 - Materials Science Forum

SP - 165

EP - 171

BT - Light Metals Technology 2015

A2 - Chikwanda, Hilda K.

A2 - Chikosha, Silethelwe

PB - Trans Tech Publications Ltd

T2 - 7th International Light Metals Technology Conference, LMT 2015

Y2 - 27 July 2015 through 29 July 2015

ER -