مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تأثیر مقدار مس بر مقاومت به سایش کامپوزیتMMC زمینه آهن Fe-C-Cu-SiC

نوع مقاله : پژوهشی اصیل

نویسندگان
1 مرکز تحقیقات انرژی و محیط زیست، واحد شهرکرد، دانشگاه آزاد اسلامی، شهرکرد، ایران
2 دانشگاه آزاد شهرکرد
چکیده
هدف از پژوهش حاضر، دستیابی به ترکیب شیمیایی بهینه در کامپوزیت زمینه فلزی (MMC) (Fe-C-Cu-SiC) برای افزایش مقاومت به سایش کامپوزیت و نیز ارزیابی خواص مکانیکی کامپوزیت بر اساس مقدار بهینه مس است به‌گونه‌ای که بتوان آن را در لنت ترمز هواپیما، لوکوموتیو و ماشین‌های مسابقه به کار برد. برای این منظور Fe، C، BaSo4 با ترکیب شیمیایی Fe- 6SiC-6.5C-6BaSO4 با مقادیر متفاوت مس (3%، 7%، 11% 15% و 19%) به روش متالورژی پودر آسیاب مکانیکی شده و سپس تحت عملیات تف‌جوشی در کوره با گاز محافظ و پرس گرم در دمای 1000C و فشار MPa 400 قرار گرفتند و 5 نمونه آزمایشی ساخته شد. آزمون‏های سایش و ضریب اصطکاک تحت نیروی 20N و 700rpm در 1000m انجام شد. . همچنین آزمون‌های سختی‏ سنجی، چگالی و بررسی ریزساختار با میکروسکوپ الکترونی روبشی SEM و نیز آنالیز EDAX برای بررسی مکانیزم سایش انجام شد. بررسی سطوح ساییده نشان داد که در مسافت اولیه لغزش، مکانیسم غالب، سایش بوده و با افزایش مسافت لغزش مکانیسم‌های سایش خراشان و اکسیداسیون و تغییر شکل پلاستیک

فعال‌شده است. همچنین نتایج آزمایش‏ها نشان داد نمونه
Fe-15Cu-6.5C-6SiC-6 BaSO4مقاومت به سایش بالاتر و ضریب اصطکاک مناسب‌تری (در محدوده مجاز 2/0 تا 4/0) نسبت به چهار نمونه دیگر داشته‌ است، بنابراین می‌توان آن را به‌عنوان کاربرد لنت ترمز معرفی کرد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The effect of copper content on the wear resistance of MMC composites (Fe-C-Cu-SiC)

نویسندگان English

Azam Beigi Kheradmand 1
Maryam Khalili 2
1 energy and emvironment Research Center Shahrekord Branch Islamic Azad university Shahrekord Iran
2 Shahrekord branch, Islamic Azad University, Shahrekord, Iran
چکیده English

The aim of this study is to achieve an optimal chemical composition in the metal matrix composite (MMC) (Fe-C-Cu-SiC) to enhance the wear resistance of the composite and evaluate its mechanical properties based on the optimal amount of copper, making it suitable for use in brake pads for aircraft, locomotives, and racing cars. For this purpose, Fe, C, and BaSO₄ with a chemical composition of (6SiC-6.5C-6BaSO₄-Fe) and varying amounts of copper (3%, 7%, 11%, 15%, and 19%) were mechanically milled using powder metallurgy. The materials were then sintered in a furnace with protective gas and hot-pressed at 1000°C and 400 MPa, resulting in five test samples. Wear and friction coefficient tests were conducted under a load of 20 N, at 700 rpm, over a distance of 1000 m. Hardness tests, density measurements, microstructural examination with a scanning electron microscope (SEM), and EDAX analysis were also conducted to assess the wear mechanism. Examination of the worn surfaces indicated that during the initial sliding distance, the predominant mechanism was abrasion. As the sliding distance increased, abrasive and oxidation wear mechanisms, along with plastic deformation, became active. Test results showed that the Fe-15Cu-6.5C-6SiC-6BaSO₄ sample had higher wear resistance and a more suitable friction coefficient (within the acceptable range of 0.2 to 0.4) compared to the other four samples, suggesting its potential application for brake pads.

کلیدواژه‌ها English

کامپوزیت
مس
لنت ترمز
MMC
کامپوزیت زمینه فلزی (MMC)
متالورژی پودر
مقاومت در برابر سایش
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