The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform

Samy Yousef - One of the best experts on this subject based on the ideXlab platform.

  • Wear Characterization of Carbon Nanotubes Reinforced Acetal Spur, Helical, Bevel and Worm Gears Using a TS Universal Test Rig
    JOM, 2015
    Co-Authors: Samy Yousef, T. A. Osman, Abdelrahman H. Abdalla, Gamal A. Zohdy
    Abstract:

    Although the applications of nanotechnologies are increasing, there remains a significant barrier between nanotechnology and machine element applications. This work aims to remove this barrier by blending carbon nanotubes (CNT) with common types of Acetal Polymer gears (spur, helical, bevel and worm). This was done by using adhesive oil (paraffin) during injection molding to synthesize a flange and short bars containing 0.02% CNT by weight. The flanges and short bars were machined using hobbing and milling machines to produce nanocomposite Polymer gears. Some defects that surfaced in previous work, such as the appearance of bubbles and unmelted pellets during the injection process, were avoided to produce an excellent dispersion of CNT in the Acetal. The wear resistances of the gears were measured by using a TS universal test rig using constant parameters for all of the gears that were fabricated. The tests were run at a speed of 1420 rpm and a torque of 4 Nm. The results showed that the wear resistances of the CNT/Acetal gears were increased due to the addition of CNT, especially the helical, bevel and worm gears.

  • A New Design of the Universal Test Rig to Measure the Wear Characterizations of Polymer Acetal Gears (Spur, Helical, Bevel, and Worm)
    Advances in Tribology, 2015
    Co-Authors: Samy Yousef, Tarek Osman, M. Khattab, Ahmed A. Bahr, Ahmed M. Youssef
    Abstract:

    This work aims to study the wear characterization of common types of Acetal Polymer gears (spur, helical, bevel, and worm) using a new TS universal test rig, in order to obtain reliable results and as a reference when compared with Acetal nanocomposite gears later. The TS universal test rig consists of three different units that are connected by a main driver shaft and a pair of constantly meshing metal spur gears, which transfer power to the bevel and worm test units. The first unit is used to test the bevel gears, the second unit is used to test the spur and helical gears, and the third unit is used to test the worm gears. The loading mechanism is similarly designed to block the brake mechanism. Hobbing and milling machines were used to machine an injection-moulded Polymer flanges and produce the tested gears. All gear pairs, except the worm gear, have identical gear ratios. The experiments were performed at speed 1420 rpm and the torque was 4 Nm. The results showed that the wear rates (in the form of weight loss) of spur gears were consistent with the previous results and the other gear types had larger wear rates.

Ahmed M. Youssef - One of the best experts on this subject based on the ideXlab platform.

  • A New Design of the Universal Test Rig to Measure the Wear Characterizations of Polymer Acetal Gears (Spur, Helical, Bevel, and Worm)
    Advances in Tribology, 2015
    Co-Authors: Samy Yousef, Tarek Osman, M. Khattab, Ahmed A. Bahr, Ahmed M. Youssef
    Abstract:

    This work aims to study the wear characterization of common types of Acetal Polymer gears (spur, helical, bevel, and worm) using a new TS universal test rig, in order to obtain reliable results and as a reference when compared with Acetal nanocomposite gears later. The TS universal test rig consists of three different units that are connected by a main driver shaft and a pair of constantly meshing metal spur gears, which transfer power to the bevel and worm test units. The first unit is used to test the bevel gears, the second unit is used to test the spur and helical gears, and the third unit is used to test the worm gears. The loading mechanism is similarly designed to block the brake mechanism. Hobbing and milling machines were used to machine an injection-moulded Polymer flanges and produce the tested gears. All gear pairs, except the worm gear, have identical gear ratios. The experiments were performed at speed 1420 rpm and the torque was 4 Nm. The results showed that the wear rates (in the form of weight loss) of spur gears were consistent with the previous results and the other gear types had larger wear rates.

Liyuan Wang - One of the best experts on this subject based on the ideXlab platform.

  • Two-component photoresists based on acidolytic cleavage of novel ester Acetal Polymer
    Advances in Resist Materials and Processing Technology XXIV, 2007
    Co-Authors: Liyuan Wang, Zhanxing Chu, Long Cheng
    Abstract:

    The reaction of acrylpimaric acid and several divinyl ether compounds, including 1,3-Bis(2-(vinyloxy)ethoxy)benzene, 2,2-bis(4-[2-(vinyloxy)ethoxy]phenyl)propane, and 1,4-Bis(2-(vinyloxy)ethoxy)benzene, can take place in the presence of organic solvents to form novel ester Acetal Polymer with the average molecular weight of 4000-6000(Mn) measured by GPC. These Polymers can be easily dissolved in common solvents and show high thermal stability. The ester Acetal Polymers can be quickly acidolyzed at the presence of strong acid generated by PAG above 100oC and become easily soluble in dilute aqueous base. Two-component positive photoresists can be formed by the ester Acetal Polymer and PAG. The lithographic performance of the resist material composed of the ester Acetal Polymer and a sulfonium triflate PAG was studied on i-line exposure instrument. Clear pattern with 2 mm resolution was obtained and the photosensitivity was below 20mj/cm2.

  • novel 193 nm positive photoresist composed of ester Acetal Polymer without phenyl group
    Proceedings of SPIE, 2007
    Co-Authors: Liyuan Wang, Xiaoxiao Zhai, Yongen Huo
    Abstract:

    1,3-adamantanedicarboxylic acid and acrylpimaric acid were reacted with an aliphatic divinyl ether, 1,4-cyclohexanedimethanol divinyl ether, to give novel ester Acetal Polymers without phenyl group. These Polymers can be dissolved in common solvents and possess high thermal stability. The ester Acetal Polymer can be quickly decomposed at the presence of strong acid generated by PAG above 100°C and become easily soluble in dilute aqueous base. Two-component photoPolymer consisting of the ester Acetal Polymer and PAG can be used as positive photoresists. The Polymer derived from 1,3-adamantanedicarboxylic acid displayed higher transparency at 193 nm and can be used for 193 nm photoresist.

Gamal A. Zohdy - One of the best experts on this subject based on the ideXlab platform.

  • Wear Characterization of Carbon Nanotubes Reinforced Acetal Spur, Helical, Bevel and Worm Gears Using a TS Universal Test Rig
    JOM, 2015
    Co-Authors: Samy Yousef, T. A. Osman, Abdelrahman H. Abdalla, Gamal A. Zohdy
    Abstract:

    Although the applications of nanotechnologies are increasing, there remains a significant barrier between nanotechnology and machine element applications. This work aims to remove this barrier by blending carbon nanotubes (CNT) with common types of Acetal Polymer gears (spur, helical, bevel and worm). This was done by using adhesive oil (paraffin) during injection molding to synthesize a flange and short bars containing 0.02% CNT by weight. The flanges and short bars were machined using hobbing and milling machines to produce nanocomposite Polymer gears. Some defects that surfaced in previous work, such as the appearance of bubbles and unmelted pellets during the injection process, were avoided to produce an excellent dispersion of CNT in the Acetal. The wear resistances of the gears were measured by using a TS universal test rig using constant parameters for all of the gears that were fabricated. The tests were run at a speed of 1420 rpm and a torque of 4 Nm. The results showed that the wear resistances of the CNT/Acetal gears were increased due to the addition of CNT, especially the helical, bevel and worm gears.

Long Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Two-component photoresists based on acidolytic cleavage of novel ester Acetal Polymer
    Advances in Resist Materials and Processing Technology XXIV, 2007
    Co-Authors: Liyuan Wang, Zhanxing Chu, Long Cheng
    Abstract:

    The reaction of acrylpimaric acid and several divinyl ether compounds, including 1,3-Bis(2-(vinyloxy)ethoxy)benzene, 2,2-bis(4-[2-(vinyloxy)ethoxy]phenyl)propane, and 1,4-Bis(2-(vinyloxy)ethoxy)benzene, can take place in the presence of organic solvents to form novel ester Acetal Polymer with the average molecular weight of 4000-6000(Mn) measured by GPC. These Polymers can be easily dissolved in common solvents and show high thermal stability. The ester Acetal Polymers can be quickly acidolyzed at the presence of strong acid generated by PAG above 100oC and become easily soluble in dilute aqueous base. Two-component positive photoresists can be formed by the ester Acetal Polymer and PAG. The lithographic performance of the resist material composed of the ester Acetal Polymer and a sulfonium triflate PAG was studied on i-line exposure instrument. Clear pattern with 2 mm resolution was obtained and the photosensitivity was below 20mj/cm2.