پديد آورنده :
اسلامي، حميدرضا
عنوان :
ساخت آلياژ نيكل- تيتانيوم متخلخل به روش سنتز احتراقي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
ساخت و توليد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
نه، 107ص: جدول، مصور، عكس، نمودار
يادداشت :
ص.ع. به: فارسي و انگليسي
استاد راهنما :
عليرضا فدائي تهراني، محمود كدخدائي
توصيفگر ها :
نايتينول , آلياژ حافظه دار نيكل- تيتانيوم , سنتز احتراقي
تاريخ نمايه سازي :
30/10/88
استاد داور :
حميدرضا ميردامادي، مرتضي شمعانيان
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
108 Fabrication of Porous Ni Ti Alloy by Combustion Synthesis Hamid Reza Eslami hamid32532@yahoo com Date of Submission August 22 2009 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiDr Alireza Fadaei Tehrani mcjaft@cc iut ac irDr Mahmoud Kadkhodaei kadkhodaei@cc iut ac irAbstractNiTi shape memory alloy SMA has a high recoverable strain up to 8 similar to that of bone 2 andhas a low elastic modulus down to 48 GPa close to that of dense cortical bone below 20GPa Recently porous NiTi with the cellular structure similar to those of some natural biomaterials such as bone has beenacknowledged as a promising biomaterial to use as artificial bones The mechanical properties of porous NiTiSMA can be easily adjusted to match with those of the replaced bones by obtaining different porosity andpore sizes through controlling the process conditions Moreover its porous structure can allow body tissuesto grow inside and body fluids to be transported through the interconnected pores which can accelerate thehealing process In present study porous Ni Ti shape memory alloy was fabricated by combustion synthesismethod as the best process to find open pores in product as an important characteristic for implants Twoseparate mixtures were prepared from elemental Ni and two types of Ti powder with less than 150 m andless than 20 m grain size one of which includes acid as a lubricant and the other with no acid Use of acidin milling stage prevents from agglomeration of powders while the powders milled with no acid willagglomerate Then both milled mixtures were compressed into mold and shape memory alloy was producedby self propagating high temperature synthesis SHS procedure after preheating stage Various effectiveparameters such as Ti powder size milling conditions the amount of compression preheating temperatureand influence of agglomeration in formation of NiTi phase were investigated To assess the compositionphases in the final product X ray diffraction XRD analysis was performed The amount of NiTi phase inthe final composition was greatly increased by reducing the Ti powder size Ni reach and Ti reach phasessuch as Ni3Ti Ni4Ti3 and NiTi2 were both shown in the product prepared from large size Ti powders whereas NiTi2 was the only secondary phase in products with synthesis by small size Ti powders whethermilled by acid or not In addition the general porosity percentage and the open porosity ratio the ratio of theopen porosity to the general porosity were measured by the liquid wheighing method according to ISO 2738standard It was shown that the general porosity of the final product was 52 consisting of 66 openporosity that is sufficient for implants since the porosity of cancellous bone is in the range of 30 to 90 Keywords Ni Ti Shape Memory Alloy Nitinol Porous Combustion Synthesis
استاد راهنما :
عليرضا فدائي تهراني، محمود كدخدائي
استاد داور :
حميدرضا ميردامادي، مرتضي شمعانيان
