A new low-cost V-free beta titanium alloy, Ti–4.7Mo–4.5Fe (TMF55), was designed based on View the MathML source– View the MathML source electronic parameters for biomedical applications. TMF55 alloy is almost half the raw materials cost of the commercial Ti–6Al–4V alloy. Microstructures, mechanical properties, chemical properties and cytotoxicity assessment of the alloy in different heat treatment conditions were investigated and compared to those of commercial Ti–6Al–4V alloy. The aging treatments increased the strength and hardness and decreased the ductility of the alloy. The Young's modulus and ultimate strength of the as-quenched TMF55 alloy (83 GPa and 974 MPa, respectively) are more compatible than that of Ti–6Al–4V alloy (110 GPa and 900 MPa, respectively) for some biomedical applications. The electrochemical behavior of the alloy was studied using potentiodynamic polarization and electrochemical impedance techniques. The corrosion current densities and the film resistances of the alloy are in the range of 3–4 nA/cm2 and order of 105 Ω cm2, respectively, they are close to those of Ti–6Al–4V alloy. The cell viability is comparable to that of commercial Ti–6Al–4V alloy, making this V-free low-cost alloy is a promising candidate for replacing the commercial Ti–6Al–4V alloy in some biomedical applications.

This paper presents a novel design of an end-effector and a process for automatic electrochemical mechanical polishing of conductive materials. The proposed end-effector employs three different actions, electrical, chemical and mechanical in a synergistic way to improve the material removal process. An industrial robot is used to hold the end-effector and a pump feeds an electrolyte to the end-effector. The end-effector circulates the electrolyte over the workpiece surface which acts as an anode. A DC voltage is applied between the anode and cathode to conduct electrochemical polishing. In addition, the end-effector keeps a rotational and linear motion of the polishing pad to conduct mechanical polishing and allows to control the contact force between the pad and the surface to be polished. The control strategy for the proposed system is presented and verified through simulation.

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This paper is aimed at proposing a new design of a corona-discharge based electrostatic motor with a cylindrical rotor made from aluminum foil and multi copper strip stator electrodes. The stator electrodes are alternately stressed positively and negatively. The onset voltage of corona discharge is calculated based on the condition of discharge sustenance at stator electrodes. The corona currents emitted from positively and negatively stressed electrodes are calculated being dependent on the applied voltage and motor geometry. This calls at first for calculation of the spatial distribution of electric field within the motor volume using the accurate charge simulation technique. The calculated corona onset voltage and current-voltage characteristics of the motor agreed reasonably with those measured experimentally for three motors built-in the laboratory. The dependency of the motor speed on the applied voltage is reported for the different investigated motors.

This paper is aimed at proposing a new design of a corona-discharge based electrostatic motor with a cylindrical rotor made from aluminum foil and multi copper strip stator electrodes. The stator electrodes are alternately stressed positively and negatively. The onset voltage of corona discharge is calculated based on the condition of discharge sustenance at stator electrodes. The corona currents emitted from positively and negatively stressed electrodes are calculated being dependent on the applied voltage and motor geometry. This calls at first for calculation of the spatial distribution of electric field within the motor volume using the accurate charge simulation technique. The calculated corona onset voltage and current-voltage characteristics of the motor agreed reasonably with those measured experimentally for three motors built-in the laboratory. The dependency of the motor speed on the applied voltage is reported for the different investigated motors.

This paper is aimed at proposing a new design of a corona-discharge based electrostatic motor with a cylindrical rotor made from aluminum foil and multi copper strip stator electrodes. The stator electrodes are alternately stressed positively and negatively. The onset voltage of corona discharge is calculated based on the condition of discharge sustenance at stator electrodes. The corona currents emitted from positively and negatively stressed electrodes are calculated being dependent on the applied voltage and motor geometry. This calls at first for calculation of the spatial distribution of electric field within the motor volume using the accurate charge simulation technique. The calculated corona onset voltage and current-voltage characteristics of the motor agreed reasonably with those measured experimentally for three motors built-in the laboratory. The dependency of the motor speed on the applied voltage is reported for the different investigated motors.

This paper is aimed at proposing a new design of a corona-discharge based electrostatic motor with a cylindrical rotor made from aluminum foil and multi copper strip stator electrodes. The stator electrodes are alternately stressed positively and negatively. The onset voltage of corona discharge is calculated based on the condition of discharge sustenance at stator electrodes. The corona currents emitted from positively and negatively stressed electrodes are calculated being dependent on the applied voltage and motor geometry. This calls at first for calculation of the spatial distribution of electric field within the motor volume using the accurate charge simulation technique. The calculated corona onset voltage and current-voltage characteristics of the motor agreed reasonably with those measured experimentally for three motors built-in the laboratory. The dependency of the motor speed on the applied voltage is reported for the different investigated motors.