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Primary Structure and Mechanical Properties of AlSi2 Alloy Continuous Ingots

Wróbel T., Szajnar J., Bartocha D., Stawarz M.

Archives of Foundry Engineering

2017

Vol. 17, iss. 2

145--150

The paper presents the research results of horizontal continuous casting of ingots of aluminium alloy containing 2% wt. silicon (AlSi2). Together with the casting velocity (velocity of ingot movement) we considered the influence of electromagnetic stirring in the area of the continuous casting mould on refinement of the ingot’s primary structure and their selected mechanical properties, i.e. tensile strength, yield strength, hardness and elongation. The effect of primary structure refinement and mechanical properties obtained by electromagnetic stirring was compared with refinement obtained by using traditional inoculation, which consists in introducing additives, i.e. Ti, B and Sr, to the metal bath. On the basis of the obtained results we confirmed that inoculation done by electromagnetic stirring in the range of the continuous casting mould guarantees improved mechanical properties and also decreases the negative influence of casting velocity, thus increasing the structure of AlSi2 continuous ingots.

Current states of small and lightweight pulsatile motor driven LVAD

Okamoto E., Tanaka S., Makino T., Miura K., Okada S., Mitoh A., Mitamura Y.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 1-2

155-160

A small size and lightweight motor-driven pulsatile LVAD using a ball screw has been developed. The motor-driven LVAD consists of a brushless DC motor and a ball-screw. The ball screw converts rotational motion of the motor into rectilinear motion of the pusher plate. The magnetic force between the tiny magnets on the pusher plate and the iron plate adhered on the pump diaphragm provides an active filling operation during the pump filling phase. The pump has a stroke volume of 55 ml, the whole volume of 285 ml and it weighs 360 g. The controller employs the fuzzy logic position and velocity control so that the LVAD experts’ experience could be used in the design of the controller. The LVAD was evaluated in the in-vitro experiments using the mock circulation. Maximum pump outflow of 5.1 l/min was obtained at the drive rate of 100 bpm against an afterload of 100 mmHg, and the active filling mechanism using the magnetic force provided a pump output of 3.6 l/min at a drive rate of 75 bpm under a preload of 0 mmHg. The operating efficiency of the LVAD was established to be measured between 8 and10%.