Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity
|Author/s||Lloreda Jurado, Pedro Javier
Chicardi Augusto, Ernesto
Paúl Escolano, Antonio
Sepúlveda Ferrer, Ranier Enrique
|Department||Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte|
|Abstract||Wicks are the main component of Loop Heat Pipe systems, whereby coolant liquid flow
through their porous structure. They are usually formed by a primary wick to produce liquid
transportation by capillary force, and a ...
Wicks are the main component of Loop Heat Pipe systems, whereby coolant liquid flow through their porous structure. They are usually formed by a primary wick to produce liquid transportation by capillary force, and a secondary wick that is continuously wetted by the liquid coolant. Traditionally, the two wicks are manufactured separately and subsequently joined, thereby creating an interface that reduces the liquid transfer efficiency. In order to overcome this situation, a gradient porous wick is proposed and successfully manufactured through the freeze-casting method in a single operation. The influence of two different dispersant agents, KD4® and stearic acid was studied on the processing parameters, final pore size and morphology, and capillarity performances. A variate of gradient porosity was obtained by applying a diverse thermal gradient and solidification front velocity during directional solidification. The rheological characterisation of the camphene-based NiO suspensions was performed using a rotational viscometer. The final pore size and morphology were characterised by Optical Microscopy, Field Emission Scanning Electron Microscopy, and X-ray computed tomography. The use of stearic acid improves the particle stabilisation and generates pore enlargement with an equiaxed pore structure, while commercial dispersant KD4® shows a dendritic pore morphology at lower thermal gradient.
|Funding agencies||Ministerio de Economía, Industria y Competitividad
PIF II.2A, VI Plan Propio de Investigación
|Citation||Lloreda Jurado, P.J., Chicardi Augusto, E., Paúl Escolano, A.G. y Sepúlveda Ferrer, R.E. (2021). Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity. Materials and Design, 206, Article number 109795.|
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