پديد آورنده :
صفايي، شهريار
عنوان :
ساخت آلياژ حافظه دار 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 :
يازده، 111ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
محمود كدخدايي
توصيفگر ها :
نايتيول , سوپر الاستيسيته
تاريخ نمايه سازي :
27/9/91
استاد داور :
محسن بدرسماي، پيمان صديق
تاريخ ورود اطلاعات :
1396/09/22
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Fabrication of Shape Memory Porous Nickel Titanium Alloy by Combustion Synthesis Shahriar Safaee s safaee@me iut ac ir 2012 04 18 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Dr Mahmoud Kadkhodaei Kadkhodaei@cc iut ac ir Abstract NiTi shape memory alloy SMA has a high recoverable strain up to 8 similar to that of bone 2 and has 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 been acknowledged as a promising biomaterial to use as artificial bones The mechanical properties of porous NiTi SMA can be easily adjusted to match with those of the replaced bones by obtaining different porosity and pore sizes through controlling the process conditions Moreover its porous structure can allow body tissues to grow inside and body fluids to be transported through the interconnected pores which can accelerate the healing process In present study porous Ni Ti shape memory alloy was fabricated by combustion synthesis method as the best process to find open pores in product as an important characteristic for implants Different separate mixtures were prepared from mechanically activated elemental Ni and Ti powder with less than 15 m and less than 25 m grain size Mechanical Activation process was done using planetary ball milling In this step the effect of Stearic acid as a process control agent PCA had been evaluated Use of acid in milling stage prevents the critical milling behavior while dry milling leads the powders to stick severely to the milling container But adding PCA to the mechanical activation MA process leads to production of undesired TiC phase It also has some effects on the compaction process dry milling was applied to the final samples using milling cycles Then different situations of milling was applied to the powders and activated milled mixtures were compressed into mold and shape memory alloy was produced by self propagating high temperature synthesis SHS Effect of various parameters on the final product such as milling conditions the amount of compression pressure ignition parameters was evaluated To assess the composition phases in the final product X ray diffraction XRD analysis was performed The amount of NiTi phase in the final composition was greatly increased by adjusting the process parameters to the proper values Compaction tests shows that samples have Young s modulus near to that of the spongy human bone In addition the general porosity percentage and the open porosity ratio the ratio of the open porosity to the general porosity were measured by the liquid weighing method according to ISO 2738 standard It was shown that the general porosity of the final product was 50 consisting of 85 open porosity which are very beneficial for bone ingrowth in orthopedic applications since it is in the range of that of cancellous human bone Keywords Nitinol shape memory alloy Porous Self propagating High temperature Synthesis Mechanical Activation Compression Test
استاد راهنما :
محمود كدخدايي
استاد داور :
محسن بدرسماي، پيمان صديق
