The Mechanical Properties of Hydroxyapatite / Au wires Composites
Date Issued
2005
Date
2005
Author(s)
Huang, Yu-Rung
DOI
zh-TW
Abstract
Hydroxyapatite (HA) is the bio-compatible material for surgical implants, at present, due to the major mineral constituents of it are similar to animals frames. Although the technique to synthesize HA has been developed for a long period, synthetic HA is still limited by its poor mechanical properties.
In the present study, we have prepared two HA matrixes with different particle size and doping gold wire as the toughened phase in hydroxyapatite((Ca10(PO4)6(OH)2, HA) matrix which was synthesized by solid-state synthesis to form ceramic composite reinforcement and to expect the possible strategies to improve the toughness of HA are proposed.
Solid-state synthesis was used to prepare the hydroxyapatute, and get two different size HA powder by ball milling and attrition mill methods. The different vatio of Au wire then add entered in two kinds of HA matrix that with different particle size. These composites undergo sintering at 1300℃.The relative density of these composites after sintering have obviously improved because the smaller particle size, and furthermore there are catalyst reaction by Au wire that better the densification and mechanical properties of composites.
The flexural strength was determined by using the 4-point bending technique. The strength of HA/Au wire composites does not increase when a small amount of Au wire is added. It illustrated that the Au wire would not influence flexural strength. Thus it could be known, the strength variation of HA/Au wire composites corresponds closely to their density variation. The fracture toughness was determined by using the single-edge-notched beam method. The different results were obtained as that for strength. The toughness of HA/Au wire composites has superior increased by doping trace Au wire. The toughness data shows that the increase of toughness is related to density and the doped of Au ductility material.
Subjects
氫氧基磷灰石
金
複合材料
Hydroxyapatite
Au
Composites
Type
thesis
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