Durable, flexible, superhydrophobic and blood-repelling surfaces for use in medical blood pumps

2018 ◽  
Vol 6 (39) ◽  
pp. 6225-6233 ◽  
Author(s):  
Zhe Li ◽  
Ba Loc Nguyen ◽  
Yi Chih Cheng ◽  
Junmin Xue ◽  
Graeme MacLaren ◽  
...  
Keyword(s):  
Medical Devices ◽  
Sand Casting ◽  
Casting Method ◽  
Blood Pumps

A new sand-casting method for fabricating superhydrophobic materials gives highly durable, flexible, and blood-repelling surfaces useful for cardiovascular medical devices.

scholarly journals The Effect of Palm Oil Fly Ash Reinforcement on Recycle Aluminium via Sand Casting

2018 ◽  
Vol 7 (4.27) ◽  
pp. 162
Author(s):  
Mohd Hafiz Mohd Noh ◽  
Azzura Ismail ◽  
Ahmad Hussein Abdul Hamid
Keyword(s):  
Fly Ash ◽  
Palm Oil ◽  
Sand Casting ◽  
Fly Ashes ◽  
Casting Method ◽  
Oil Fly Ash

Recycle aluminium has been mixed with palm oil fly ash based on fraction weight of overall weight of palm oil fly ashes to aluminium recycle. The ratios discussed on this paper are 0%, 3% 6%, 9%, 12% and 15%. The samples have been developed via sand casting method. The result shows that the best composition has been achieved when we added 3% of palm oil fly ashes, with the new composite aluminum have a highest hardness with the value of 119.7HV, with the Modulus of raptured of 7.71Mkg/m2  

Effect of Equal Channel Angular Pressing on Microstructure and Mechanical Properties of As-Cast Al-B4C Composite

2015 ◽  
Vol 813-814 ◽  
pp. 34-39
Author(s):  
Karunanaithi Saravanan ◽  
Mariappan Senthil Kumar ◽  
Perumal Venkatachalam ◽  
Rajaram Raghavan
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Automobile Industry ◽  
Metal Matrix ◽  
Sand Casting ◽  
Casting Method ◽  
Angular Pressing ◽  
Composite Microstructure

In this experiment, comparison analysis of mechanical properties, porosity and grain size of Pure Al (powder), 95%AL + 5% B4C (With sand casting method) and 95%AL + 5% B4C (With ECAP method) are determined. The ECAP method value is much greater than the sand casting method,because of metal matrix composite microstructure refinement during the pressing operation. Because of material porosity value decreases, powder particle consolidation, the closure of porosity, grain refinement and improve in dislocation occurs as ECAP method gives the results of Mechanical properties as like tensile strength 105.8Mpa, Hardness 94HV, density 888.88kg/m3values increase. At the same time, porosity and grain size value will be reduced because of individual power consolidation happening during ECAP methods like as 1.63% and 8μm. In this metal matrix composite is applied to aeronautical and automobile industry

A Fluidity Study of Semi-Solid Rheo-Slurry of AC4C Aluminum Alloy in Gravity Sand Casting

2011 ◽  
Vol 337 ◽  
pp. 439-442 ◽  
Author(s):  
Thiensak Chucheep ◽  
Rungsinee Canyook ◽  
Tanate Rattanochaikul ◽  
Somjai Janudom ◽  
Sirikul Wisutmethangoon ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Molten Metal ◽  
Solid Fraction ◽  
Liquidus Temperature ◽  
Sand Casting ◽  
Sand Mold ◽  
Casting Method ◽  
New Approach ◽  
Gravity Casting ◽  
Semi Solid

A new approach to evaluate fluidity of semi-solid rheo-slurries was developed. The equipment was designed in order to reduce pouring error by using bottom tapping and heated tapping ladle. Commercial AC4C aluminum alloy slurries were tested in spiral sand mold by gravity casting. The slurries were prepared by introducing fine gas bubbles into molten metal above the liquidus temperature at different rheocasting times. Average fluidity and microstructures of cast spirals were reported. Results show that the spiral microstructure is non-dendritic and the fluidity of AC4C alloy decreases with increasing solid fraction. In conclusion, the spiral casting method using bottom tapping can be used to evaluate the fluidity of rheocast slurries in gravity sand casting.

Effect of Degassing Time and Cooling Rate on Microstructure and Porosity of Aluminum 6061 Alloy Using Sand Casting Method

2019 ◽  
Vol 964 ◽  
pp. 124-129 ◽  
Author(s):  
Wikan Jatimurti ◽  
Boby Alexander ◽  
Alvian Toto Wibisono
Keyword(s):  
Tensile Strength ◽  
Cooling Rate ◽  
Raw Materials ◽  
Liquid Aluminum ◽  
Sand Casting ◽  
The Other ◽  
Test Results ◽  
Casting Method ◽  
Porosity Level ◽  
Aluminum 6061 Alloy

This research is aimed to get a better understanding on the effort of reducing the porosity level in aluminum alloys. The degassing process (2, 5 and 8 minutes) is done to reduce the hydrogen content in liquid aluminum and cooling rate modifications (13 °C / min, 20 °C / min and 26 °C / min) was performed to reduce the porosity by reducing the size of Dendrite Arm Spacing (DAS). The casting method used in this research is sand casting and raw materials were melted using an electric furnace at 720 °C. The microstructural images showed the DAS size are decreased by size from 137.3 μm to 87.58 μm obtained from cooling rates of 13 °C / min and 26 °C / min respectively. In the other hand, the level of porosity is also decreased from 3.58% at 2 min degassing and the cooling rate of 13 °C / min to 1.8% at 5 min degassing and 26 °C / min cooling rate. Furthermore, the tensile test results show that the value of tensile strength increases when the DAS size and porosity level are smaller. The highest ultimate tensile strength value is 105.9 and the lowest is 70,53 MPa.

Blood Flow Through Channels and Clearances in Implantable Pumps

2007 ◽  
Author(s):  
Steven W. Day
Keyword(s):  
Medical Devices ◽  
Blood Cells ◽  
Mechanical Design ◽  
Design Criteria ◽  
Design Strategies ◽  
Blood Damage ◽  
Blood Pumps ◽  
Patients With Heart Failure ◽  
Flow Through ◽  
Rotary Blood Pumps

Implantable rotary blood pumps are very effective at supporting patients with heart failure. New designs demonstrate distinct advantages over their predecessor diaphragm type pumps and have generated vast interest in the medical devices community, as demonstrated by hundreds of technical publications and newer commercially available devices. In addition to mechanical design criteria, these pumps share the requirement of moving a relatively large amount of blood through a miniaturized pump without damaging the blood cells. The fluid channels within the impeller are typically 1–3 mm wide and the clearance between the blades, rotating at 2,000–10,000 rpm, and the stationary housing is approximately 100–300μm. This paper gives examples of experimental and numerical methods to characterize the flow field, and a summary of how the flow affects blood cells and design strategies to minimize blood damage.

scholarly journals Comparative Study of Aluminum Alloy Casting obtained by Sand Casting Method and Additive Manufacturing Technology

2019 ◽  
Vol 41 ◽  
pp. 682-689
Author(s):  
P. Rodríguez-González ◽  
A.I. Fernández-Abia ◽  
M.A. Castro-Sastre ◽  
P.E. Robles ◽  
J. Barreiro ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Additive Manufacturing ◽  
Comparative Study ◽  
Sand Casting ◽  
Manufacturing Technology ◽  
Casting Method ◽  
Aluminum Alloy Casting ◽  
Alloy Casting ◽  
Additive Manufacturing Technology

Application of Sand Casting to Recycle Aluminum Alloy for Motorcycle Brake Handle

2016 ◽  
Vol 705 ◽  
pp. 357-361
Author(s):  
I Nyoman Gde Antara ◽  
Karohika Gatot Made ◽  
Gunawan Ketut
Keyword(s):  
Impact Strength ◽  
Automotive Industry ◽  
High Impact ◽  
Sand Casting ◽  
Raw Material ◽  
Casting Method ◽  
Drum Brake ◽  
High Impact Strength ◽  
Vehicle Components ◽  
Recycle Aluminum

The development of the automotive industry brings impact of increasing use of aluminum for vehicle components that will ultimately produce more aluminum waste. If it is not addressed properly, it will be a serious problem for the environment. One of the solutions is to recycle the waste of drum brake to be a raw material for motorcycle accessories brake handle. The process of making motorcycle brake handle using the sand casting method can be done by varying the temperatures of casting molten metal which are at temperatures of 650°C, 700°C and 750°C. Furthermore, the testing of the mechanical properties and microstructure of the resulted product is done. The result shows that motorcycle brake handle required high impact strength in which the highest impact strength was 0.011 Nm/mm2 that was obtained when temperature of casting was 700°C.

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