球狀鐵顆粒添加對鎂鋅鈣金屬玻璃機械性質改善之研究;The Improvement of Mechanical Properties of Mg-based Metallic Glass with Ex-situ Adding Spherical Iron Particles

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Title:	球狀鐵顆粒添加對鎂鋅鈣金屬玻璃機械性質改善之研究;The Improvement of Mechanical Properties of Mg-based Metallic Glass with Ex-situ Adding Spherical Iron Particles
Authors:	施博錕;Shih, Po-Kun
Contributors:	機械工程學系
Keywords:	球狀鐵顆粒;骨科植入器材;生物降解;金屬玻璃;spherical iron particles;orthopedic implants;biodegradable;Metallic Glass
Date:	2017-08-16
Issue Date:	2017-10-27 16:19:45 (UTC+8)
Publisher:	國立中央大學
Abstract:	隨著醫療水平的日益提升，具有生物降解特性之植入材料備受醫學器材界關注，因為其擁有能夠在生物體內自主分解，免除二次手術取出造成術後感染的風險。鎂、鋅、鈣為人體內含量極高之金屬元素，將其製造形成非晶質之鎂基金屬玻璃，不但具有良好的生物相容性，同時具有貼近骨骼之楊氏係數，非常適合骨科植入器材方面的應用。然而，鎂鋅鈣金屬玻璃在常溫下呈現出嚴重脆性，尚待克服。本研究選用該系統中擁有相對優異的玻璃形成能力之Mg66Zn29Ca5為基材，添加球狀次μm級之鐵顆粒製作出金屬玻璃複材。實驗結果得知，在添加低體積分率鐵顆粒可有效提升金屬玻璃之壓縮破裂強度，複材抗壓強度可達到853 MPa，但由於細小尺寸之球狀鐵顆粒容易形成部分團聚，影響鐵顆粒球體與基材介面結合度，以致於強化顆粒無法很有效地阻擋Shear band 的傳播，因此其塑性變形量並沒有顯著提升。;With the increasing level of medical care, the biodegradable property of the implant material has been concerned by the medical equipment sector because of its self-degradability which can avoid the risk of secondary surgery to remove the implant and postoperative infection. Since magnesium, zinc and calcium are metal elements with high content in the human body. Therefore, the Mg-based bulk amorphous alloy (BAA) made of Mg, Zn, and Ca elements will have the advantages not only good biocompatibility, but also lower Young′s modulus close to human bone, and very suitable for the applications on orthopedic implants. However, Mg-Zn-Ca amorphous alloy shows severe brittleness at room temperature and need to be overcome. In this study, Mg66Zn29Ca5 with relatively good glass forming ability was selected as the base alloy and ex-situ added sub-micrometer-sized spherical iron particles to form the Mg-based amorphous alloy composites (BAAC). The experimental results show that adding low volume fraction of Fe particles can effectively improve the compression and fracture strength of Mg-based BAA, and the maximum compressive strength of the composite can reach to 853 MPa. However, the sub-micrometer-sized spherical iron particles are very easy to agglomerate and affect the interface adhesion between the particles and amorphous matrix. So that, the sub-micrometer-sized Fe particles cannot effectively restrict the propagation of shear band and distinctly improve the plasticity of MgZnCa-based BAA.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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