The PhD student (Osama Abdul-Bari khuder) discussed his thesis entitled ( Improvement Some Properties of Gallium Alloy for Dental Application). The discussion was held on the discussions hall / building C / Department of Materials Engineering / University of Technology on Thursday (19/01/2020). The discussion committee was formed of the teaching staff listed:

 Abstract

  Amalgam fillings are widely used in because of the low cost, strength, high durability and ease of application, but also the most controversial of dental restorative materials because of doubts about the likelihood of toxicity of mercury.

Gallium has the second lowest melting temperature and the ability to react with metals and alloys at room temperature so the gallium base alloy was introduced as mercury-free amalgam.

The aim of this work is to prepare Galloy which consist of liquid alloy (Gallium ,Tin, and Indium) and powder alloy ( Silver, Tin, Copper )  that represent base alloy ,then adding Bismuth nano powder , Nickel-Titanium alloy nano powder prepared by powder metallurigy and then crushed into powder  and TiO₂ nano tube with different percentage (1%,2%,3%,4% and 5% wt%) to reinforced the base alloy and improve the mechanical ,physical and chemical properties.

The specimen were made according to the American Dental Association (ADA) specification No.1, with a diameter of 6 mm and 12 mm in length (cylindrical shape) , a mixture of 1:0.5 of powder alloy and liquid alloy respectively , a Teflon mould was used and a compressive stress of 14 MPa was applied by punching for 85 second , after 30 minutes the specimen was ejected from the mold and kept at 37 ᵒC  to be tested .

Hardness, compressive strength, dimetrial strength, and creep tests were done for all prepared specimens. All the three additives work to improve the mechanical properties as its percentage increases.

Scanning Electron Microscope with EDS were done for the base alloy (Galloy), 5%Bi/Galloy, 5%NiTi/Galloy, and 5%TiO₂/Galloy.to illustrate the microstructure and existing phases.

X-Ray Diffraction (XRD) test was done for the amalgam powder alloy , niti alloy powder , base alloy (Galloy ) , 5% bi/galloy , 1%bi/galloy ,3%bi/galloy ,5%niti/galloy and 5%tio2/galloy to identify the result phase during the reaction.

X-Ray Flourescence XRF test was done for Ga, Bi, In, and Sn to insure the purity of the used materials.

Chemical test like ions releas and corrosion were performe where the corrosion behavior was determined for all prepared specimen in artificial saliva with different pH (7.2 ,4.6 ,3.3) and different NaF concentration (0 ,1000,2500,5000 ppm).The ion release was done for the base alloy (Galloy), 5%Bi/Galloy, 5%NiTi/Galloy, and 5%TiO₂/Galloy where the specimen immersed in artificial saliva of pH (3.3) for one month and kept at 37ᵒC to indicate the released ions in the solution.

The dissertation was scientifically evaluated by Assist. Prof. Dr. Abdul Raheem kadhim / Babylon University / College of Engineering / Department of Materials Engineering, and linguistically by Lec. Dr. Muhaned Najah Jawad / University of Technology / Department of Materials Engineering.

The thesis discussion was conducted in a scientific atmosphere and a PhD degree with grade of pass was awarded to the student after the completion of all the corrections that have been decided by the examiners.

Lecture  Dr. Muhannad Najah Jawad in the Department of Materials Engineering, started his duties of the assistant head of the department for scientific affairs, according to Administrative Order No. 5 B D H / 594 dated 02/20/2020. We congratulate him for this  the position wishing him success .

• Dr. Aseel B. Abdul Hussein, Prof. Dr. Imad S. Abdul Karim, Prof. Dr. Marwa S. Atallah, and Reem A. Mohamed were participating in the second patent exhibition held by the Industrial Research and Development Authority for the period of 17-18 December, 2019. The participation was as follows:
• Dr. Aseel B. Abdul Hussein, Prof. Dr. Imad S. Abdul Karim, Prof.Dr. Marwa S. Atallah were participate with the patent “Substitute Manufacturing Materials Resistant to Erosion/ Corrosion of the Airframe and Propellers of Ships & Boats Marine Composed of Nano Materials Composites”.

 Abstract

Manufacturing of nano composites materials resistant to erosion and corrosion alternative basis of which material polymer composed of (pure polyester+ 3%glass fibers, kevlar fibers and carbon subsidized 0.5, 1, 1.5, 2) % for certain powder carbon nano tubes) were presented.

• Dr. Aseel B. Abdul Hussein, Prof. Dr. Imad S. Abdul Karim, Eng. Reem A. Mohamed with the patent titled “Coating of laboratories drainage pipes and oil products pipes with erosion resistance composite materials reinforced with carbonates and natural wastes”.

Abstract

In the present work, drainage pipes and pipes for oil products transportation were resistance to erosion wear and fabricated from composite materials of natural waste like saw-dust, carrote powder , rice husk , CaCO₃, K₂CO₃, Na₂CO₃ with epoxy and glass fiber.

• Dr. Rana A. Majeed, Ass. Prof. Dr. Jamal J. Dawood, Ass. Prof. Hanaa A. Smeij, Ass. Prof. Dr. Lama A. Jallo, Ass. Prof. Dr. Neveen Jamal, Ass. Prof. Majid H. Abdul Majeed, Dr. Laith W. Ismail, Dr. Ahmed H. Ali, Dr. Shaima M. Saleh, Dr. Hind B. Ali, Lecturer Aseel Mahmoud, Mervat M. Hanous, Minh F. Khudair, and Haider B. Ali were participating in the training of the workshop:

“Scientific Promotion Instructions and Procedures”

It was held by the Department of Electrical Engineering, University of Technology, cooperation with the Central Committee for Scientific Promotion on Tuesday, January 7^th, 2020 at the Tigris Hall.

Prof. Dr. Faraj M. Mohamed, Prof. Dr. Hanan A. Akkar, and Prof. Dr. Khaleda F. Suhail presented and discussed the terms and instructions of the scientific promotions with clarifying their conditions.

A PhD student, Haider A. Salal, defended his dissertation “Fabrication of Advanced Ceramic Materials for Bio Composite Applications” on Thursday, January 16^th, at the conference room (C), Department of Materials Engineering, University of Technology. The Committee members included:

The dissertation was scientifically evaluated by Ass. Prof. Dr. Sadiq J. Abbas, Al-Nahrain University, College of Engineering, and linguistically by Dr. Rabab A. Abdel Aziz, University of Technology, Materials Engineering Department.

The discussion was conducted in a scientific atmosphere and a master's degree with grade of pass was awarded to the student after the completion of all the corrections that have been decided by the examiners.

Abstract

  Bioapplications often involve many biomaterials such as polymeric materials , ceramic and metal materials. Improved properties have been demonstrated upon use these different classifications of biomaterials. Epoxy and unsaturated polyester are commonly used in Prosthetics . Therefore, it can be strengthened by (nano and micro materials) and fibers to enhance the mechanical and tribological properties.

         This work includes the manufacturing process of nanoparticles consisting of two oxides to produce two types of particles ((Al₂O₃ - CaO) and (Al₂O₃-MgO)) by sol gel process and study the effect of temperature on the resulting CNP, were treated at (550 and 850) ⁰C and were used (aluminum, calcium and magnesium) Nitrate as raw materials for the manufacturing of CNP from ((Al₂O₃ - CaO) and (Al₂O₃-MgO)). Then the resulting powders were examined showing that the powders which are treated at lower temperatures (550) gave less particle size , more smoothness and particles of random and irregular shape. In addition, the manufacturing method gave high purity particles which indicates the success of the used manufacturing method.

          The other part of the work involves the manufacturing of two polymer blends (epoxy and unsaturated polyester) and the effect of adding one to the other at weight fractions (2,4,6 and 8% wt) . The results showed that the best results achieved at (4% EP + 96% UPE). where the (tensile ,compression, bending , impact and hardness) test results of (4% EP + 96% UPE) were (42.9,102 , 59.5)Mpa , (0.4 J) and 74 shore D) respectively , comparing with the main UPE sample where it gave test  results of (38.2, 98 , 42.5)Mpa  , (0.33 J) and 61shore D) respectively .

         The results showed that the addition of UPE to EP improves the properties of the epoxy for all ratios up to (8% UPE + 92% EP) where the best results of  (tensile ,compression, bending and impact and hardness) tests of the (8% UPE + 92% EP) were ( (48.1, 59.5 , 45) Mpa , (0.29 J) and 73 shore D) respectively , comparing with the main EP sample where it gave test results (30.8,69 , 30.5)Mpa , (0.29 J) and 58.5 shore D) respectively.

       For the polymer blends , the wear rate was reduced at the above mentioned ratios for both types (4% EP + 96% UPE) and (8% UPE + 92% EP) comparing to the basic samples of EP and UPE.