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Register a new userA Research On Properties Of Plasma Coating From Ferro Oxide Composite Materials
البحث في خواص الطلاء البلازمي من مواد مركبة فيروأكسيدية
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خليل موسى عزيمة( باحث )
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أعطى استخدام المواد المركبة و التكنولوجيا الحديثة للترسيب بالبلازما إمكانية الحصول علـى طلاء ذي خواص مميزة. و بسبب التحـولات الفيزياكيميائيـة و التكـافؤ المتغيـر و المتانـة الترموديناميكية المنخفضة للفيروأكاسيد يتمتع الطلاء من مواد مركبة فيروأكسـيدية بسـمات استثمارية عالية، و يؤمن الحماية لعناصر الآلات التي تعمل في ظروف قاسية. بينت دراسة سلوك المواد المركبة الفيروأكسيدية أثناء عملية الترسيب أن التحولات التي تطرأ على هذه المواد تشبه إلى حد ما التحولات عند التلبيد. درس تأثير شدة تيار مولد البلازما في القساوة الميكروية للأطوار المتشكلة و على نسب تركيب الأطوار و على مسامية الطـلاء مـن مواد مركبة فيروأكسيدية. و تبين أن القساوة الميكروية ترتفع مع زيادة شدة تيار مولد البلازما و تنخفض المسامية. كما درست مقاومة الاهتراء لهذا الطلاء في ظروف الاحتكـاك الجـاف و المزيت و ذلك بالمقارنة مع مواد أخرى، و بينت النتائج أن الطلاء من مركبات فيروأكسـيدية تملك مقاومة عالية للاهتراء و معامل الاحتكاك المنخفض. من الضروري عند اختيار المـادة المرسبه تحديد المتطلبات المرجوة من الطلاء و تحليل ظروف استثماره على عناصر محـدده من الآلات و ذلك للحصول على طلاء يتمتع بخواص استثمارية عالية.
The use of composite materials, and modern technology of plasma spraying has provided a possibility to obtain a coating with very special properties. Owing to physics- chimecs changes, changeable valence, low thermodynamic strength for Ferro-oxides the coating, which made from Ferro oxide composite, has very high specifications investment, and provides protection for machines which work in difficult circumstances. Ferro oxide composites behavior, during spraying, studies shows that changes which took place in these materials are similar to those which happened during sintering. An influence of plasma generator current intensity has been studied on microhardness of forming phases, on phases structure propositions, and on porosity. Microhardness increase when current intensity was increased, while porosity is decreased. Wear resistance has also been studied for this post in both, dry and wet (oily) friction circumstances. Comparable with other materials it has been found that Ferro oxide materials had a high resistance for wear and a low friction coefficient. It is also important that when selecting the spraying materials, to determine requirements which we need from coating and to analyze its investment circumstances on specific elements of machines to obtain a high investment properties coating.
References used
Hull D. Clyne T.W. An introduction to composite materials – Cambridge Solid Science Series 1996-610p
كودينوف ب.ب وغيرة. الترسيب بالبلازما للفيروأكسيد مجلة فيزياء وكيمياء معالجة المواد 1989
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