بررسی و تعیین اثر رطوبت، فشار پرس و زمان آسیاب، بر بهبود چگالی و خواص مکانیکی کاربید سیلیسیم
محورهای موضوعی : سرامیک ها و مواد نسوزحسین کیا 1 , پویا پیرعلی 2 * , حمیدرضا بهاروندی 3
1 - پژوهشکده مکانیک - دانشکده مهندسی مواد و فناوری های ساخت - دانشگاه صنعتی مالک اشتر
2 - پژوهشکده مکانیک - دانشکده مهندسی مواد و فناوری های ساخت - دانشگاه صنعتی مالک اشتر
3 - پژوهشکده مکانیک - دانشکده مهندسی مواد و فناوری های ساخت - دانشگاه صنعتی مالک اشتر
کلید واژه: سل – ژل اکسید مضاعف نقره باتری لیتیوم یون آند تداخلی,
چکیده مقاله :
کاربید سیلیسیم به دلیل استحکام فشاری بالا، قیمت مناسب و دسترسی آسان، از سرامیکهای پرکاربرد خصوصا در ساخت زرهها می¬باشد. اما، تردی زیاد، یکی از مهمترین مشکلات این سرامیکها است که از طریق اضافه کردن افزودنی و یا اصلاح و بهبود فرایند ساخت، می توان آن را کنترل نمود. در این مقاله به بررسی و تعیین روش ساخت و فراوری سرامیک کاربید سیلیسیم با هدف بهبود خواص مکانیکی و کاهش تردی از طریق پارامترهایی همچون فشار پرس، رطوبت و زمان آسیاب پرداخته شده است. مراحل کار شامل؛ طراحی آزمایش، ساخت نمونه و تعیین خواص فیزیکی و مکانیکی و تعیین بهترین حالت با توجه به متغییرهای پاسخ شامل چگالی خام، استحکام خمشی و استحکام فشاری است. نهایتا پس از ساخت نمونه با مقادیر مختلفی از فشار پرس از 30 تا 120 بار، زمان آسیاب از 1 تا 3 ساعت و رطوبت از 4 تا 13 درصد و تعیین چگالی، مقاومت خمشی و مقاومت فشاری آن‌ها، بهترین مقادیر خواص مکانیکی و چگالی در رطوبت 7 درصد، زمان آسیاب 1 ساعت و فشار پرس 120 بار، بدست آمده است. بعد از این مراحل با استفاده از این مقادیر رطوبت، زمان آسیاب و فشار پرس، نمونه اصلی تهیه و در دمای حدود 2000 درجه سانتی‌گراد پخت می‌گردد. با تعیین خواص مکانیکی شامل سختی، مدول یانگ، چقرمگی شکست و همچنین چگالی نمونه نهایی بعد از پخت، مشخص می‌شود که نمونه ساخته شده با شرایط کاری رطوبت، فشار پرس و زمان آسیاب تعیین شده ، بیشترین انطباق را با خواص نامی کاربید سیلیسیم دارد.
Due to its high compressive strength, reasonable price and easy access, silicon carbide is one of the most widely used ceramics, especially in the manufacture of armor. However, high brittleness is one of the most important problems of these ceramics, which can be controlled by adding additives or modifying and improving the manufacturing process. In this paper, the method of manufacturing and processing silicon carbide ceramics has been investigated with the aim of improving properties through lines such as press pressure, humidity and grinding time. The work steps include; determining the experiment strategy, manufacturing the sample and determining the physical and mechanical properties and the best condition according to the response variables including raw density, bending and compressive strength. Finally, after manufacturing samples with different amounts of press pressure from 30 to 120 bar, grinding time from 1 to 3 hours and moisture percentage from 4 to 13% and determining their density, bending and compressive strength, the improved values of mechanical properties and The density was obtained at 7% humidity, 1 hour milling time, and 120 times press pressure. After these steps and using the determined working conditions, the main sample is finished and baked at 2000 degrees Celsius. By determining the mechanical properties including hardness, Young's modulus, fracture toughness and also the density of the final sample after baking, it is determined that the sample made with the working conditions of humidity, pressing pressure and grinding time is the most consistent with the nominal properties of the silicon carbide.
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