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Article
Effect of Fly and Dust Ash Additions on Hardness and Wear Resistance of Composite Metal Matrix (Al-Si-Mg)

Authors: Siham E. Salih --- Sahib M. Al-Saffar --- Solaf Majeed Darkhan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 16 Pages: 3345-3358
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The current paper deals with the preparation of bars with a length of about 13 cm and 2.5 cm diameter from MMC materials. These composites consists of cast (Al-Si-Mg) as a matrix that reinforced with fly ash (0.454 ìm) or fly dust (0.620 ìm) in relative weights (2, 4, 6, and 8%) respectively. Both of composite materials samples were manufacturedby casting method (Vortex method). Vortex method has been used successfully to obtain a homogeneous distribution of reinforcement particles. Samples were classified into two categories according to the type of reinforcement particles. The results showed that thewear rate of the samples depends heavily on the working conditions. Which increases with increased load and download time.The results also showed superiority aluminum alloy reinforced fly ash compared with the aluminum alloy reinforced with dust flying. Furthermore, a significant increase in the hardness and wear resistance for all samplesprepared with increasing added particles for the purpose of reinforcement.


Article
Effect of Accelerated Weathering on the Compressive Strength for PMMA Nano Composites and PMMA Hybrids Nano Composites Used in Dental Applications

Authors: S.I. Salih --- J.K. Oleiwi --- A.M. Talia
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 3 Part (A) Engineering Pages: 204-215
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In the present research, efforts are made to develop the properties of PMMA resin that used for upper and lower prosthesis complete denture, by addition four different types of nanoparticles powders, which are fly ash, fly dust, zirconia and aluminum that added with different ratios of volume fractions of (0.01, 0.02 and 0.03) to poly methyl methacrylate (PMMA), cold cured resin (castavaria) is the new fluid resin (pour type) as a matrix. The nano composite and hybrid nano composite for prosthetic dentures specimens, preparation was done by using (Hand Lay-Up) method as six groups which includes: the first three groups consists of PMMA resin reinforced by fly ash , fly dust and ZrO2 nanoparticles respectively, the second three groups consists of three types of hybrid nano composites, which includes ((PMMA:X% fly ash) - (1%Al + 3%ZrO2)), ((PMMA:X% fly dust) - (1% Al + 3%ZrO2)) and ((PMMA:nZrO2) - (1% fly ash+ 3% fly dust)) respectively. As well as, the effect of moisture and UV was taking into consideration in this study. The compression test results shows that the values of compressive strength, compressive elastic modulus, and compressive strength under the effect of accelerated weathering (moisture and UV radiation) increased with the addition of nano powders (fly ash, fly dust, zirconia and aluminum). As well as, the results showed that the maximum values of compressive strength reach to (286.25MPa) for (PMMA + 2%nZrO2) nano composite. In addition, the results showed that the compressive elastic modulus reach to the maximum value (25.4166GPa) in the nano composite material (PMMA + 2%nZrO2). Moreover, the results showed that the compressive strength under the effect of accelerated weathering (moisture and UV radiation) reach to the maximum value to (315MPa) for the nano composite material (PMMA + 3%nZrO2).


Article
Effect of Water Absorption on the Compressive Strength for PMMA Nano Composites and PMMA Hybrids Nano Composites Reinforced by Different Nanoparticles Used in Dental Applications

Authors: Sihama E. Salih --- Jawad K. Oleiwi --- Alaa Mohammed.T
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 14 Part (A) Engineering Pages: 2654-2669
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Poly methyl methacrylate (PMMA), are widely used as a prosthodontic denture base, the denture base materials should exhibit good mechanical properties and dimensional stability in moist environment. In the present research, efforts were made to develop the properties of PMMA resin that used for upper and lower prosthesis complete denture, by addition four different types of nanoparticles, which are fly ash, fly dust, zirconia and aluminum that added with different ratios of volume fractions of (1%, 2% and 3%) to poly methyl methacrylate (PMMA), cold cured resin (castavaria) is the new fluid resin (pour type) as a matrix. In this work, the Nano composite and hybrid Nano composite for prosthetic dentures specimens, preparation was done by using (Hand Lay-Up) method as six groups which includes: the first three groups consists of PMMA resin reinforced by fly ash , fly dust and ZrO2 nanoparticles respectively, the second three groups consists of three types of hybrid Nano composites, which includes ((PMMA:X% fly ash)+ (1%Al + 3% ZrO2 )), ((PMMA:X% fly dust)+ (1%Al + 3% ZrO2)) and ((PMMA:X%nZrO2)+(1%fly ash+3%fly dust)) respectively. As well as, the effect of water absorption was taking into consideration in this study. The compression test results show that the values of the compressive strength with and without the effect of water absorption increased with the addition of Nano powders (fly ash, fly dust, zirconia, and aluminum). Also, the results showed that the maximum values of compressive strength reach to 286.25MPa for (PMMA: 2%nZrO2) Nano composite. Whereas the maximum values of compressive strength for hybrid Nano composite reach to 270MPa for ((PMMA: 2%fly ash) + (1%Al + 3% ZrO2)) hybrid Nano composite. Moreover, the results showed that the maximum value of compressive strength under the effect of water absorption reach to 335MPa in the Nano composite material (PMMA+2% fly dust), whereas the maximum value of compressive strength under the effect of water absorption for hybrid Nano composite reach to 362MPa for ((PMMA: 2% fly dust) + (1%Al + 3% ZrO2)) hybrid Nano composite.


Article
Investigation of Hardness and Flexural Properties of PMMA Nano Composites and PMMA Hybrids Nano Composites Reinforced by Different Nano Particles Materials used in Dental Applications

Authors: Sihama E. Salih --- Jawad K. Oleiwi --- Alaa Mohammed.T
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 15 Part (A) Engineering Pages: 2838-2853
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Poly methyl methacrylate (PMMA), widely used as a prosthodontic denture base, the denture base materials should exhibit good mechanical properties and dimensional stability in moist environment. In the present research, efforts are made to develop the properties of PMMA resin that used for upper and lower prosthesis complete denture, by addition four different types of nanoparticles, which are fly ash, fly dust, zirconia and aluminum that added with different ratios of volume fractions of (1%, 2% and 3%) to poly methyl methacrylate (PMMA), cold cured resin (castavaria) is the new fluid resin (pour type) as a matrix. In this work, the Nano composite and hybrid Nano composite for prosthetic dentures specimens, preparation was done by using (Hand Lay-Up) method as six groups which includes: the first three groups consists of PMMA resin reinforced by fly ash , fly dust and ZrO2 nanoparticles respectively, the second three groups consists of three types of hybrid Nano composites, which includes ((PMMA: X% nF.A)+ (1%Al + 3% ZrO2)), ((PMMA: X% nD.A)+ (1%Al + 3% ZrO2)) and ((PMMA - X%nZrO2)+(1%F.A + 3%F.D)) respectively. The hardness and flexural tests results show that the values of the hardness, flexural strength, Maximum shear stress and flexural modules increased and with the addition of Nano powders (fly ash, fly dust, zirconia, and aluminum). And the results showed that the maximum values of hardness reach to (84.166) for ((PMMA: 3%nZrO2) + (1%F.A + 3%F.D)) hybrid Nano composite, whereas the maximum values of hardness for Nano composite reach to (83.333) for (PMMA: 3%nZrO2) Nano composite. Also, the results showed that the maximum values of flexural strength and Maximum shear stress reaches to (101MPa) and (2.4738MPa) respectively for (PMMA: 2%nF.D) Nano composite. Moreover, the results showed that the maximum values of flexural modules reaches to (13.95GPa) for ((PMMA: 3% nF.A) + (1%Al + 3%ZrO2)) hybrid Nano composite, whereas the maximum values of flexural modules for Nano composite reach to (12GPa) for (PMMA-3%nZrO2) Nano composite.


Article
FLEXURAL AND IMPACT PROPERTIES OF PMMA NANO COMPOSITES AND PMMA HYBRIDS NANO COMPOSITES USED IN DENTAL APPLICATIONS
خصائص الأنحناء و الصدمة لمتراكبات البولي مثيل ميثا اكريليت النانوية و متراكبات البولي مثيل ميثا اكريليت النانوية الهجينة المستخدمة في تطبيقات طب الأسنان

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Abstract

Due to the enjoyment of poly methyl methacrylate material of significant advantages in mechanical and physical properties, which encouraged many researchers in recent years working on the used it’s as a prosthodontics denture base material. In the present research, efforts are made to develop the properties of PMMA resin that used for upper and lower prosthesis complete denture, by addition four different types of nanoparticles powders, which are fly ash, fly dust, zirconia and aluminum that added with different ratios of volume fractions of (1%, 2% and 3%) to poly methyl methacrylate (PMMA), cold cured resin (castavaria) is the new fluid resin (pour type) as a matrix. In this work, the Nano composite and hybrid Nano composite for prosthetic dentures specimens, preparation was done by using (Hand Lay-Up) method as six groups which includes: the first three groups consists of PMMA resin reinforced by fly ash , fly dust and ZrO2 nanoparticles respectively, the second three groups consists of three types of hybrid Nano composites, which includes ((PMMA: X%nF.A)+(1%Al+3%ZrO2)), ((PMMA: X%nF.D)+ (1%Al + 3%ZrO2)) and ((PMMA - nZrO2)+(1%F.A + 3%F.D)) respectively. The flexural and impact tests results show that the values of the flexural strength, Maximum Shear stress, flexural modules, impact strength and fracture toughness increased with the addition of nano powders (fly ash, fly dust, zirconia and aluminum). And the results showed that the maximum values of flexural strength and Maximum shear stress reaches to 101Mpa and 2.4738Mpa respectively for (PMMA: 2%nF.D) Nano composite. Moreover, the results showed that the maximum values of flexural modules for hybrid Nano composite ((PMMA: 3% nF.A) + (1%Al + 3%ZrO2)) reach to 13.95 Gpa, whereas the maximum values of impact strength reaches to 7.8KJ/m2 for (PMMA: 1% nF.D) Nano composite. And, the results showed that the maximum values of fracture toughness for Nano composite reach to 26.8 Mpa.m1/2 for (PMMA: 3% nF.D) Nano composite.

نظرا لما تتمتع بها مادة البولي مثيل ميثا اكريليت من مزايا هامة في خواصها الميكانيكية والفيزيائية، مما شجع العديد من الباحثين في السنوات الأخيرة في العمل على استخدامها كمادة قاعدة أسنان تعويضية .في هذا البحث تم أجراء عدة محاولات لغرض تطوير مواصفات راتنج البولي مثيل ميثا اكريليت المستخدم كقاعدة طقم أسنان أصطناعي كامل علوي أو سفلي. وقد حضرت المواد المتراكبة من راتنج البولي مثيل ميثا أكريليت المعالج ذاتياً (كاستافاريا) كمادة أساس وقد تم تقويتها بأربعة أنواع مختلفة من المساحيق النانوية تضمنت: دقا ئق الرماد المتطايرالنانوية، دقائق الغبار المتطايرالنانوية، دقائق أوكسيد الزركونيوم النانوية ودقائق الألمنيوم النانوية, أضيفت الدقائق النانوية بكسور حجمية مختارة هي (1%, 2% and 3%). في هذا البحث حضرت ستة مجاميع من العينات كأطقام للأسنان الأصطناعية المتراكبة النانوية و المتراكبة النانوية الهجينة بطريقة (الصب اليدوي). المجاميع الثلاثة الأولى تضم راتنج البولي مثيل ميثا اكريليت المقواة بدقائق الرماد المتطايرالنانوية، دقائق الغبار المتطايرالنانوية ودقائق أوكسيد الزركونيوم النانوية على التوالي، المجاميع الثلاثة الثانية تضم ثلاثة أنواع من المتراكبات النانوية الهجينة وهي ((PMMA: X% nF.A) + ((1%Al+3% ZrO2) ، ((PMMA: X% nF.D)+ ((1%Al +3% ZrO2)و (PMMA -nZrO2)) +((1%F.A + 3%F.D) على التوالي. أظهرت نتائج أختبارات الأنحناء و الصدمة أن قيم مقاومة الأنحناء ، أجهاد القص الأعظم، معامل الأنحناء، مقاومة الصدمة و متانة الكسر زادت مع إضافة دقا ئق الرماد المتطاير النانوية، دقائق الغبار المتطايرالنانوية ودقائق أوكسيد الزركونيوم النانوية. وأظهرت النتائج بأن القيم القصوى لمقاومة الانحناء و أجهاد القص الأعظم وصلت إلى 101Mpa و 2.4738Mpa بالتعاقب للمتراكبة النانوية .(PMMA: 1% nF.D) أيضا، أظهرت النتائج بأن القيم القصوى لمعامل الأنحناء وصلت إلى13.95Gpa للمتراكبة النانوية الهجينة (((PMMA: 3% nF.A +((1%Al+3% ZrO2) ، وعلاوة على ذلك، أظهرت النتائج بأن القيم القصوى لمقاومة الصدمة وصلت إلى 7.8 KJ/m2 للمتراكبة النانوية .(PMMA: 1% nF.D), كما وبينت النتائج بأن القيم القصوى لمتانة الكسر وصلت إلى 26.8 Mpa.m1/2 للمتراكبة النانوية (PMMA:1% nF.D)

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