تأثير إضافة مسحوق الألومينا على مقاومة البلى لسبيكة  Zn--4All المصنعة بطريقة ميتالورجيا المساحيقميتالورجيا المساحيق: Effect of Alumina Powder Addition on Wear Resistance of ZN-4AL Alloy Prepared by Powder Metallurgy Method

علي مزهر رسن

doi:10.24237/djes.2015.08303

Authors

علي مزهر رسن قسم والمعادنقسم هندسة الانتاج والمعادن ، ألجامعة التكنولوجيةألجامعة التكنولوجية

Keywords:

سبائك زنك المنيوم, الومينا, ميتالورجيا المساحيق, مقاومة البلى

Abstract

يهدف هذا البحث الى تحضير سبائك الزنك المنيوم ) - Zn-4Al ( بطريقة ميتالورجيا المساحيق. حيث تم العملفي هذا البحث أستخدام مسحوقي الزنك والألومنيوم بعد عملية الخلط للمسحوقين وبنسبة Zn-4Al . وبعدها تم اي ضا1% وبعدها اجريت عملية المزج لضمان تجانس مسحوق الألومينا ،3 ، اضافة مسحوق الألومينا وبنسب وزنية 4)3O2(Al مع الخليط للخارصين المنيوم. تم إج ا رء عملية الكبس على البارد عند - 6.5 ton وبقالب اسطواني. وبعدها تمإج ا رء عملية التلبيد للعينات عند 335 °C ولمدة ساعة واحدة وباستخدام غاز الأركون كغاز خامل. تم تحضير العينات للفحص ألمجهري وقياس الصلادة بواسطة التنعيم والصقل. كذلك تم فحص الكثافة الخض ا رء و الكثافة الحقيقية وفحص حيود الأشعة السينية ومقاومة البلى. بينت النتائج ان زيادة نسبة مسحوق الألومينا تؤدي الى زيادة الكثافة الخض ا رء بعد الكبس أما الكثافة الحقيقية فانها تزداد بعد التلبيد مقارنة مع الكثافة الخض ا رء. كذلك تم النقصان في حجم المسامات ونسبة المسامية بسبب تكوين اطوار صلدة من مركبات الزنك والألومينا. أدى ذلك بالنتيجة الى زيادة قيم صلادة فيكرز المايكروية ومقاومة البلى للمكبوسات بسبب تكوين الطور الثانوي الصلد ) 6Zn4Al ( ووجود حبيبات مسحوق الألومينا.

This research is aimed to produce Zn-4Al alloys by using powder metallurgy technique. Zinc and aluminum powders were thoroughly mixed to obtain Zn-4 wt% Al. Alumina powder with different weight percents 2, 3 and 4 then added to Zn-4 wt% Al mixture. Careful mixings were applied to guarantee homogeneous distribution of alumina in the zinc-aluminum powder mixture. Cold pressings at 6.5 t using cylindrical die were done. Sintering of samples at 335 ^oC for a period of 1 hr using argon gas as an inert gas were made. Grinding, polishing and etching were applied to the sintered samples in order to study the microstructure and hardness. Green density, true density, X-ray diffraction and wear resistance were also investigated. Results obtained showed that increasing the volume fraction of alumina increased the green density after pressing while the true density increased after sintering as compare with green density. Both the size of porosity and its percentage decrease because the formation of hard phases from zinc and aluminum. This is lead to increase the Vickers hardness and enhance the wear resistance of samples due to the formation of second phase of Al4Zn6 and also to the presence of alumina powder.

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