research centers


Search results: Found 4

Listing 1 - 4 of 4
Sort by

Article
Improve Wear Resistance on Al 332 Alloy Matrix- Micro -Nano Al2O3 Particles Reinforced Composite
تحسين مقاومة البليان لسبيكة الالمنيوم A332 المقواة بدقائق سيراميكية ونانوية من الالومينا

Loading...
Loading...
Abstract

The wear behavior of alumina particulate reinforced A332 aluminium alloy composites produced by a stir casting process technique were investigated. A pin-on-disc type apparatus was employed for determining the sliding wear rate in composite samples at different grain size (1 µm, 12µm, 50 nm) and different weight percentage (0.05-0.1-0.5-1) wt% of alumina respectively. Mechanical properties characterization which strongly depends on microstructure properties of reinforcement revealed that the presence of ( nano , micro) alumina particulates lead to simultaneous increase in hardness, ultimate tensile stress (UTS), wear resistances. The results revealed that UTS, Hardness, Wear resistances increases with the increase in the percentage of reinforcement of Al2O3 when compared to the base alloy A332. The wear rates of the composites were considerably less than that of the aluminum alloy at all applied loads with increasing percentage of reinforcement when compared to the base alloy A332.

ان سلوك البليان لسبيكة المنيوم A332 مدعمة بدقائق سيراميكية من الالومينا وباحجام مختلفة (12 مايكرون، 1 مايكرون، 50 نانومتر ) و بنسب وزنية مختلفة (0,05 ، 0,1، 0,5، 1) % وباستخدام تقنية السباكة احتسبت وباستعمال جهاز فحص العينات .ان خصائص المواصفات الميكانيكية تعتمد على توزيع الدقائق النانوية والمايكروية ، فهذا التوزيع ادى الى تحسن الصلادة وواجهاد الشد الاعلى ومقاومة البليان حيث ان مقاومة البليان تزداد بزيادة نسبة الالومينا. ان معدل البليان للمتراكبات يعتبر اقل من سبائك الالمنيوم تحت تاثير نفس الحمل مع زيادة نسبة الالومينا مقارنة بالسبيكة الاصلية.


Article
Study the Effect of Nano Ceramic Particles on Some Physical Properties of Acrylic Resins

Author: Q.A. Hamad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 2 Part (A) Engineering Pages: 124-129
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

In the present research, study the effect of adding two different types of reinforcing particles, which included: nano-alumina (nano-Al2O3) and nano-silica (nano-SiO2), that added with different volume fractions of (1%, 2% and 3%), on some physical properties of composite prosthesis complete denture base materials by using self (cold) cure poly methyl methacrylate (PMMA) resin as new fluid resin matrix. In this research, the composite prosthetic dentures specimens consist of two groups were prepared by using (Hand Lay-Up) method according to the types of reinforced particles, which includes: the first group consists of PMMA resin reinforced by nano-alumina particles, and the second group consists of PMMA resin reinforced by nano-silica particles. The physical tests were performed on these specimens include (water absorption test and thermal behaviors test). The result of this study showed the values of (thermal conductivity and thermal diffusivity) properties increased with increasing the volume fraction of both (nano-Al2O3 and nano-SiO2) particles in PMMA complete denture base materials. While, the values of (water absorption and specific heat) properties decreased. In addition, the addition of (nano-Al2O3) particles has a noticeable effect on the all properties of composite material for prosthetic denture base specimens more than the (nano-SiO2) particles.


Article
INVESTIGATION SOME MECHANICAL PROPERTIES OF SELF CURED PMMA RESIN REINFORCED BYDIFFERENT TYPES OF NANO PARTICLES
الأستقصاء من بعض الخصائص الميكانيكية لراتنج البولي مثيل ميثا أكريليت المقوى بانواع مختلفة من الدقائق النانوية

Author: Qahtan Adnan Hamad قحطان عدنان حمد
Journal: Iraqi journal of mechanical and material engineering المجلة العراقية للهندسة الميكانيكية وهندسة المواد ISSN: 20761819 Year: 2017 Volume: 17 Issue: 3 Pages: 585-598
Publisher: Babylon University جامعة بابل

Loading...
Loading...
Abstract

In the present research, study the effect of adding two different types of reinforcing particles, which included: nano-alumina (nano-Al2O3) and nano-silica (nano-SiO2), that added with different volume fractions of (1%, 2% and 3%), on the some mechanical properties of composite prosthesis complete denture base materials by using self (cold) cure poly methyl methacrylate (PMMA) resin as new fluid resin matrix . In this research the composite prosthetic dentures specimens consist of from two groups were prepared by using casting methods, type (Hand Lay-Up) method according to the types of reinforced particles which includes: the first group consists of PMMA resin reinforced by nano-alumina particles, and the second group consists of PMMA resin reinforced by nano-silica particles. The mechanical tests were performed on these specimens include compression test, impact test, and hardness test . The result of this study showed the values of (compression strength and hardness) properties increased with increasing the volume fraction of both (nano-Al2O3 and nano-SiO2) particles in PMMA complete denture base materials. While, the values of (impact strength) property decreased . Also the addition of (nano-Al2O3) particles has a noticeable effect on the most properties of composite material for prosthetic denture base specimens more than the (nano-SiO2) particles, except the impact strength property .

في هذا البحث تم دراسة تاثير اضافة نوعين مختلفين من دقائق التقوية تضمنت دقائق الالومينا النانوية ودقائق السيليكا النانوية والتي تمت اضافتهما بكسور حجمية مختلفة هي (%1%,2%,3)، على بعض الخواص الميكانيكية لمواد قاعدة طقم الاسنان الأصطناعية الكاملة المتراكبة, وذلك باستخدام راتنج البولي مثيل ميثا اكريليت المعالج ذاتياً كمادة أساس على شكل راتنج سائل جديد . في هذا البحث حضرت عينات أطقام الاسنان الأصطناعية المتراكبة باستخدام طرق السباكة, باستخدام طريقة (الصب اليدوي) على شكل مجموعتين هي: المجموعة الاولى تضم راتنج البولي مثيل ميثا اكريليت مقواة بدقائق الاولومينا النانوية، والمجموعة الثانية تضم راتنج البولي مثيل ميثا اكريليت مقواة بدقائق السيليكا النانوية.تضمنت الاختبارات الميكانيكية التي تم اجرائها على هذه العينات فحوصات الانضغاط، الصدمة، والصلادة للعينات. وقد أظهرت نتائج هذه الدراسة بان قيم خواص (مقاومة الانضغاط والصلادة) ازدادت مع زيادة الكسر الحجمي لكلا من دقائق الالومينا النانوية ودقائق السيليكا النانوية. بينما قلت قيم خواص (مقاومة الصدمة) . كذلك ان دقائق الالومينا النانوية تمتلك تاثير اكبر من دقائق السيليكا النانوية على أغلب خواص المواد المتراكبة لعينات قاعدة طقم الاسنان الأصطناعية, ماعدا خاصية مقاومة الصدمة .


Article
Study the Effect of Nano-Al2O3 and Fiber Glass on Mechanical and Physical Properties of PMMA Composites for Prosthetic Denture

Author: Qahtan A. Hamad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 7 Part (A) Engineering Pages: 715-722
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

In the present research, investigate the effect of adding some reinforcing materials which include nano-aluminum oxide (nano-Al2O3) particles that added with different volume fractions of (1%, 2%, 3% and 4%), and random fiber glass that added with fix volume fractions of (4%), into the PMMA matrix as new cold cure resin, and study some mechanical and physical properties of these hybrid laminated composite as prosthesis denture base material. Specimens’ of this project were prepared by using (Hand Lay-Up) method to form a hybrid laminated composites materials. The mechanical tests were performed on these specimens include (tensile test, impact test, flexural test and hardness test), while the physical test was thermal behavior test. Results of this study showed the values of (tensile strength, hardness, thermal conductivity and thermal diffusivity) properties increased when adding the (nano-Al2O3) particles in PMMA composite materials for prosthetic denture base materials. While, the values of impact strength and flexural strength properties were decreased.

Listing 1 - 4 of 4
Sort by
Narrow your search

Resource type

article (4)


Language

English (3)

Arabic and English (1)


Year
From To Submit

2018 (1)

2017 (2)

2014 (1)