Abstract
Mg-based metal matrix composites (MMCs) reinforced with Hydroxyapatite (Ca10(PO4)6(OH)2, HAP) nanoparticles have been studied as bone substitute materials because of their excellent biocompatibility and biological activity. In this paper, Mg/HAP MMCs with different HAP contents (0.5, 1.0 wt%) were selected and the micro-drilling properties were revealed. Firstly, the chip of MMCs was analyzed. Secondly, the surface roughness of Mg/HAP MMCs under different cutting parameters was studied. The results showed that the surface roughness decreases with the increasing of feedrate and decreases with the increasing of spindle speed, which are contrary to pure Mg. Furthermore, the shapes of burr are all classified as uniform burr, and the burr height increased with the increase of spindle speed and feed. Finally, the size effect of micro-drilling was studied. The minimum cutting thickness per tooth of Mg/HAP MMCs was determined to be 1.0 μm.
Highlights
Magnesium (Mg), the sixth richest element in nature, has been studied for nearly 200 years [1]
The micro-machinability of pure Mg and Mg/HAP metal matrix composites (MMCs) was comprehensively studied by microdrilling with uncoated cutting tools
The chip shape of pure Mg and Mg/HAP MMCs increases with the increase of feedrate and spindle speed
Summary
Magnesium (Mg), the sixth richest element in nature, has been studied for nearly 200 years [1]. Mg has been extensively studied as a human implant material due to its excellent biocompatibility and indications of local or systemic toxicity free [3,4]. Matrix metal composites (MMCs) can solve the shortcoming of low ductility and low mechanical resistance of pure Mg by adding other nanoparticles [6]. Hydroxyapatite (Ca10(PO4)6(OH), HAP) has chemical and structural similarities to bone and dental minerals and is used as a biomedical material because of its excellent biocompatibility and biological activity [7]. HAP is difficult to form in the specific form required for bone repair and implantation due to its inherent hardness and brittleness, which limits its use as a biomedical material.
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