添加不同金屬顆粒對鎂鋅鈣 塊狀金屬玻璃複材熱性質及機械性質之研究;Study of Thermal and Mechanical Properties of Mg-based Bulk Metallic Glass Composite with Ex-situ Adding Different Metal Particles

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/81719

Title:	添加不同金屬顆粒對鎂鋅鈣塊狀金屬玻璃複材熱性質及機械性質之研究;Study of Thermal and Mechanical Properties of Mg-based Bulk Metallic Glass Composite with Ex-situ Adding Different Metal Particles
Authors:	蔣智偉;Chiang, Chih-Wei
Contributors:	機械工程學系
Keywords:	生物降解;生物相容性;金屬玻璃;核殼結構;裂紋;破裂韌性;biodegrade;biocompatibility;bulk metallic glass composite (BMGC);core-shell structure;crack;fracture toughness
Date:	2019-08-21
Issue Date:	2019-09-03 16:40:32 (UTC+8)
Publisher:	國立中央大學
Abstract:	由於鎂鋅鈣塊狀金屬玻璃材料沒有晶界，相較於聚乳酸類之高分子材料可大幅減緩降解速度，同時，具有較好的機械性質以及與人體的骨骼相近之楊氏係數，因此適合用於骨科植入物。但是，缺乏韌性的金屬玻璃特性影響了後續加工與應用，所以，本研究選擇以具有較佳玻璃形成能力的Mg66Zn29Ca5 塊狀金屬玻璃為基材，分別添加不同體積分率(5、10和15 vol.%)之鈦鋯金屬玻璃顆粒、鐵顆粒及多孔鉬顆粒來製作鎂基金屬玻璃複材，利用外添加顆粒來達到散佈強化的效果，使其具有阻擋裂紋傳遞，藉此提升塊狀金屬玻璃之韌性，並探討不同直徑及核殼結構的棒材之非晶性、熱性質及機械性質。以直徑3 mm棒材為例，添加多孔鉬顆粒之複材，隨著添加量增加至15 vol.%，破裂韌性從1.10提升至6.01 MPa‧m1/2，且最大抗壓強度亦能保持702 MPa，亦在壓縮測試後觀察到vein-like pattern，因所添加顆粒與鎂鋅鈣金屬玻璃之彈性係數不同，因此能夠吸收裂紋的能量，阻止其快速傳遞與增生，雖然有些較強裂紋無法完全抵擋，但能延長及分散較強的裂紋，進而減緩材料被破壞的時間。為提升棒材尺寸並維持其非晶性，發展出一個新核殼結構(core-shell structure)，由實驗結果顯示，core-shell structure棒材確實能提升其非晶性及熱性質，且結果相似於3 mm棒材，而添加多孔鉬顆粒之3 mm與core-shell複材，依然保持非晶質結構及良好玻璃形成能力，其破裂韌性為4.81 MPa‧m1/2，且最大抗壓強度為589 MPa，與直徑3 mm棒材表現相仿。;Mg-Zn-Ca bulk metallic glass(BMG) is a well-known candidate for bio-implant application due to its biocompatibility and uniform biodegradability which is suitable for suture anchor. Suture anchors are utilized as fixation devices in orthopedic surgery for repair of soft tissue injuries in the knee, shoulder, hip and ankle joints. However, the intrinsic brittleness of Mg-Zn-Ca BMG has to be significantly improved for commercial application. Accordingly, the concept of ex-situ adding ductile metallic particles was introduced to produce the Mg-Zn-Ca bulk metallic glass composite (BMGC) to meet the requirement of mechanical property for the application of suture anchor. In this Study, the Mg66Zn29Ca5 BMG was selected as the base alloy and added with different micro-sized spherical metal particles (Fe or porous Mo or TiZr-based metallic glass particles) to enhance its fracture toughness. The optima results occur at 3 mm Mg-Zn-Ca BMGC rods with 15 vol.% porous Mo particles, the fracture toughness increased upto 6.01 MPa‧m1/2 and remained the maximum compressive strength of 702 MPa. Due to the limitation of cooling rate, both Mg66Zn29Ca5 BMG and BMGC rods with 4 mm in diameter present only partial amorphous status. Therefore, a novel core-shell structure rod was developed, with pure Mg rod as core and Mg66Zn29Ca5 BMG and BMGC as shell to increase the cooling rate. As a result, the 1.25 mm thick shell area of 4 mm core-shell BMGCs rods (added with porous Mo particles) exhibits a fully amorphous matrix co-existing with Mo particles. The optimum performance occurs at the 4 mm core-shell rods with 15 vol.% porous Mo particle additions, the fracture toughness increased from 1.5 to 4.81 MPa∙m1/2 and remained the maximum compressive strength of 589 MPa.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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