多孔鎂基非晶質合金之機械性質和非晶特性皆適合利用於製造生物自然降解之骨科植入物。本研究利用真空熱壓製程將鎂基非晶質粉體加入不同體積比例的銀和空間支架顆粒的混合物製作成具有孔隙的鎂基非晶質合金多孔複材，藉由控制銀比例和氯化鈉空間支架顆粒的體積分率，得到孔隙率 13.5 %~33.4 %的孔隙濃度梯度試片，其孔隙尺寸在 100-250 µm 之間，與人體的骨骼結構相似，而添加適當顆粒大小、適當體積濃度之銀顆粒，不僅有助於提升抗菌性，也改善試片整體的機械性質。 利用 DSC 示差掃描熱分析儀和 X 光繞射儀對熱壓試片進行分析，可得知在熱壓過程中，粉體轉化為塊材時，添加的銀沒有跟鎂基非晶質基材進行反應，非晶塊材仍然保有非晶質合金之特性。因此可利用和鎂基非晶質基材熱壓製程相似之熱壓參數進行銀參雜比例之調整，而得到最好的銀參雜比例為 2 %體積比例。最佳的銀添加比例可使非晶塊材的抗壓強度由無添加銀的 216 MPa 提升到 502MPa，伸長量自 3.23 提升到 7.22 %。 清除空間支架比例後的機械性質，對於多孔塊材來說，銀添加的熱壓試片對孔隙的敏感性較高，因此在多孔非晶材料的機械性質表現，無添加銀的多孔材機械性質優於添加銀的多孔材，此結果為銀顆粒和鎂基非晶質合金基材結合性不佳，在清除空間支架顆粒時銀顆粒脫落所導致。然而在孔隙濃度梯度試片中，孔隙材中間緻密之添加銀的鎂基非晶質塊材夾心與未添加銀的非晶塊材相比具有較佳的機械性質，可為整體提供更好的支撐，其楊氏係數也更接近於理想骨骼。因此添加銀的孔隙濃度梯度試片表現較佳。可綜合調整空間支架顆粒的比例和銀參雜之體積比例共同控制塊材之機械性質而得到理想的人體骨骼植入材料。;The porous Mg-based amorphous composite is suitable for making biodegradable orthopedic implants because of its mechanical properties and amorphous structure. The porous Mg-based amorphous composite dispersed with different volume ratios of silver were prepared by a spacer method. By controlling the silver ratio and the volume fraction of sodium chloride (NaCl) particles as a spacer, the porosity gradient samples with porosity of 13.5% to 33.4% were obtained, and the pore size ranged from 100 to 250 µm, similar to the bone structure of the human body. Dispersed silver particles into matrix can also enhance mechanical properties and antibacterial. Through the analysis of differential scanning calorimetry (DSC) and X-ray diffraction (XRD) for the samples after hot pressed, it was found that there is no reaction between silver particles and Mg-base matrix, and the Mg-base matrix can maintain as an amorphous structure. Among of all, the best mechanical properties of the Mg-base amorphous composite were occurred at the addition of 2% volume fraction of silver particle. The compressive strength can be reach up to 502 MPa and with the elongation 7.22%. In the other hand, the Mg-based amorphous alloy added with Ag particles was also used NaCl particles for the spacer to fabricate the gradient sample which is similar to the human bone. It can be found that the dense Mg-based amorphous alloy added with Ag particles present outstanding mechanical properties. However, the porous Mg-based amorphous composite sample added with Ag particle presents noticeable decrease in strength. This is suggested that the Ag particle would be pooled off during the leaching process of removing the spacer. With the material is fabricated as the porous samples,the silver particles are easily to fall which reduce the strength of the alloy.
