مقایسه تجربــی ریزساختار و خواص سطحی نمونه Al/Al2O3 تولید شده با روش‌های متالورژی پودر و تف‌جوشی پلاسمای جرقه‌ای

نوع مقاله : مقاله مستقل

نویسندگان

1 کارشناسی ارشد مهندسی مکانیک، دانشگاه صنعتی بیرجند

2 استادیار مهندسی مکانیک، دانشگاه صنعتی بیرجند

3 دانشیار مهندسی مواد، دانشگاه صنعتی بیرجند

چکیده

با توجه به اهمیت بالای روش‌های ساخت با پودر فلزاتی همچون آلومینیوم، در این پژوهش با استفاده از پودر آلومینیوم خالص، نمونه‌هایی با دو روش متالورژی پودر و تف‌جوشی پلاسمای جرقه‌ای ساخته و سپس نمونه‌ها از نظر ریزساختار، سختی، مقاومت سایشی و مقاومت خوردگی مورد بررسی قرار گرفتند. روش سینترینگ پلاسمای جرقه‌ای نسبت به روش متالورژی پودر بهبود قابل توجهی در میزان سختی، تراکم ریزساختار، افزایش مقاومت به سایش و خوردگی آلومینیوم نشان می‌دهد. این بهبود را می‌توان به سرعت و دمای بالای فرآینـد تف‌جوشی و همچنین اعمال همزمان نیرو و دما و در نتیجه چگالی کامل‌تر ساختار نسبت داد. ضریب سایش و سختی به ترتیب از 9/0 و 43 برینل در روش متالورژی پودر به 8/0 و 3/49 برینل در روش تف‌جوشی پلاسمای جرقه‌ای افزایش یافته است. همچنین با توجه به نتایج آزمون خوردگی، مقاومت خوردگی خطی نمونه تف‌جوشی‌ پلاسمای‌جرقه‌ای بیشتر از نمونه متالورژی پودر مرسوم نشان داده شده است.

کلیدواژه‌ها

موضوعات


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