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Article
Effect of Additives on the Properties of Different Types of Greases

Author: Muhannad A.R. Mohammed
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2013 Volume: 14 Issue: 3 Pages: 11-21
Publisher: Baghdad University جامعة بغداد

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Abstract

The aim of this research is to study the influence of additives on the properties of soap greases, such as lithium, calcium, sodium, lithium-calcium grease, by adding varies additives, such as graphite, molybdenum disulfide, carbon black, corrosion inhibitor, and extreme pressure. These additives have been added to grease to obtain the best percentages that improve the properties of grease such as load carrying, wear resistance, corrosion resistance, drop point, and penetration. The results showed the best weight percentages to all types of grease which give good properties are 1.5% extreme pressure additive, 3% graphite, 1% molybdenum disulfide, 2.5% carbon black. The other hand, the best weight percentage for corrosion inhibitor is 1% to lithium-calcium grease, 2% to lithium grease, and 3% to sodium grease. It was concluded that there is no need to add corrosion inhibitor to calcium grease


Article
EFFECT OF TYPE AND CONCENTRATION OF FLUID LUBRICANT ADDITIVE ON THE PROPERTIES OF GREASES
تأثير نوع وتركيز مائع التزييت على خواص الشحوم

Author: Dr. Muhannad A.R. Mohammed Zayneb Hyder Abood
Journal: Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد ISSN: 20761819 Year: 2014 Volume: 14 Issue: 2 Pages: 195-207
Publisher: Babylon University جامعة بابل

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Abstract

The main aim of this research is to study the effect of fluid lubricant on the properties of soap greases, such as lithium, calcium, sodium, and lithium – calcium.Base stock oils 40, 60, and 150 have been added with different concentrations to grease to obtain the best concentration that improves the properties of greases such as load carrying, wear resistance, corrosion resistance, drop point, and penetration.Decrease in grease properties has been noticed when adding 20 % of base sock oil 40, and 30 % of base stock oil 60, but no significant change being observed of base stock oil 150.Also, it is noticed that as the viscosity of base stock increases the effect of oil on changing grease properties will decrease.

ان الهدف الاساسي من هذا البحث هو دراسة تاثير نوع وتركيز مائع التزييت على خواص الشحوم الصابونية مثل شحم الليثيوم ، الكالسيوم ، الصوديوم ، وليثيوم – كالسيوم . تم اضافة ثلاث انواع من زيوت الاساس 40 , 60 , 150 بتراكيز مختلفة الى الشحوم لغرض الحصول على افضل النسب التي تحسن خواص الشحوم من حيث قابليتها على تحمل الضغط العالي ، مقاومة السوفان ، مقاومة التاكل ، درجة السقوط ، والنفاذية . وجد ان هنالك انخفاض في خواص الشحوم عند اضافتها بنسب 20% لزيت الاساس 40 ، 30% لزيت الاساس 60 ، وعدم ظهور تغير ملحوظ بالنسبة لزيت الاساس 150 .لوحظ بان زيادة لزوجة زيت الاساس سوف يقلل من تأثير زيت الاساس على خصائص الشحوم .

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