Analysis of printing parameters for metal additive manufactured parts through Direct Ink Writing process

Direct Ink Writing is an Additive Manufacturing process in which a metal ink is continuously extruded to built-up a green metal part. Therefore, a debinding and sintering process is required to obtain the final metal part. This thermal process produces a shrinkage of the green printed part according to several material and printing parameters. In this paper, the influence of printing process planning on the width of printed rods for a copper ink is analyzed by means of a Design of Experiments procedure to optimize the printing and equipment parameters and characterize the shrinkage after the sintering processPeer ReviewedPostprint (published version

Magnesium phosphate cement formulated with low grade magnesium oxide with controlled porosity and low thermal conductivity as a function of admixture

Magnesium phosphate cement (MPC) formulated with low-grade magnesium oxide (LG-MgO) can be better considered as sustainable MPC (sust-MPC). Among other properties, sust-MPC could be used as building material for constructive elements because of its acoustic and thermal insulation properties. Porosity and thermal conductivity are two important parameters that have a significant influence on thermal insulation properties. In this regard, this work aimed to obtain a highly porous sust-MPC with enhanced properties for thermal insulation. To this end the percentage of porosity as a function of both the amount of set-retarding admixture and the kneading water needed was assessed using a statistical design of experiments (DoE) approach. Additionally, thermal conductivity was also evaluated with respect these two factors. Last but not least, an optimized dosage was sought in order to maximize the percentage of porosity while achieving the lowest thermal conductivity. According to the results obtained, the statistical method successfully predicted the effects of variables on the final properties. Hence, a model that explains the overall behaviour of the system was successfully attained. The obtained model predicts the porosity and the thermal conductivity of sust-MPC by means of the mixture dosage. Consequently, the present work demonstrates that it is possible to control the porosity in order to diminish thermal conductivity. Keywords Insulation; building material; design of experiments; MPC; porosity; thermal conductivit

Study of the effect of EAFD in polymer composites usig DoE

This study assesses the processing behaviour and mechanical properties of different polymers widely used in several industry fields formulated with Electric Arc Furnace Dust (EAFD) as filler. Design of Experiments (DoE) has been proved to be an effective tool to obtain the maximum information with the minimum number of experiments. In this experimental design mechanical properties as well as the melt flow index were chosen as dependent variables. The effect of CaCO3, BaSO4 and EAFD fillers as well as different polymer matrix has been evaluated.Peer ReviewedPostprint (published version

Magnesium phosphate cement formulated with low grade magnesium oxide with controlled porosity and low thermal conductivity as a function of admixture

© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/Magnesium phosphate cement (MPC) formulated with low-grade magnesium oxide (LG-MgO) can be better considered as sustainable MPC (sust-MPC). Among other properties, sust-MPC could be used as building material for constructive elements because of its acoustic and thermal insulation properties. Porosity and thermal conductivity are two important parameters that have a significant influence on thermal insulation properties. In this regard, this work aimed to obtain a highly porous sust-MPC with enhanced properties for thermal insulation. To this end the percentage of porosity as a function of both the amount of set-retarding admixture and the kneading water needed was assessed using a statistical design of experiments (DoE) approach. Additionally, thermal conductivity was also evaluated with respect these two factors. Last but not least, an optimized dosage was sought in order to maximize the percentage of porosity while achieving the lowest thermal conductivity. According to the results obtained, the statistical method successfully predicted the effects of variables on the final properties. Hence, a model that explains the overall behavior of the system was successfully attained. The obtained model predicts the porosity and the thermal conductivity of sust-MPC by means of the mixture dosage. Consequently, the present work demonstrates that it is possible to control the porosity in order to diminish thermal conductivity.Peer ReviewedPostprint (author's final draft

Experimental assessment of an analytical model of the convective heat transfer coefficient in a mine gallery

This version of the article has been accepted for publication, after peer review and is subject to Springer Nature’s AM terms of use. The Version of Record is available online at: http://dx.doi.org/10.1007/s42461-022-00593-1Peer ReviewedObjectius de Desenvolupament Sostenible::7 - Energia Assequible i No ContaminantObjectius de Desenvolupament Sostenible::9 - Indústria, Innovació i InfraestructuraPostprint (author's final draft

Influence of the electric arc furnace dust in the physical and mechanical properties of EVA-polyethylene-butene blends

This study assesses the processing behaviour and mechanical properties of different thermoplastic polymers filled with Electric Arc Furnace Dust (EAFD). Design of Experiments (DoE) approach enabled the evaluation of the influence of each component and the interactions between them. There were prepared different composite formulations varying the content of EAFD. The mechanical properties and the melt flow index (MFI) of composites were selected as output responses and the effect of CaCO3, BaSO4 and EAFD fillers as well as different polymer matrixes were evaluated. It was observed that slight variations in the formulation yield to a broad range of response values. Polyethylene-co-vinyl acetate (EVA) concentration showed a significant effect on all responses. It was found that the presence of EAFD increased fluidity and decreased the elasticity modulus and the elongation at break. In addition, when added with barite, the presence of EAFD caused an increase of the tensile strength.Peer ReviewedPostprint (published version

Study of the effect of EAFD in polymer composites usig DoE

This study assesses the processing behaviour and mechanical properties of different polymers widely used in several industry fields formulated with Electric Arc Furnace Dust (EAFD) as filler. Design of Experiments (DoE) has been proved to be an effective tool to obtain the maximum information with the minimum number of experiments. In this experimental design mechanical properties as well as the melt flow index were chosen as dependent variables. The effect of CaCO3, BaSO4 and EAFD fillers as well as different polymer matrix has been evaluated.Peer Reviewe

Magnesium phosphate cement formulated with low grade magnesium oxide with controlled porosity and low thermal conductivity as a function of admixture

Magnesium phosphate cement (MPC) formulated with low-grade magnesium oxide (LG-MgO) can be better considered as sustainable MPC (sust-MPC). Among other properties, sust-MPC could be used as building material for constructive elements because of its acoustic and thermal insulation properties. Porosity and thermal conductivity are two important parameters that have a significant influence on thermal insulation properties. In this regard, this work aimed to obtain a highly porous sust-MPC with enhanced properties for thermal insulation. To this end the percentage of porosity as a function of both the amount of set-retarding admixture and the kneading water needed was assessed using a statistical design of experiments (DoE) approach. Additionally, thermal conductivity was also evaluated with respect these two factors. Last but not least, an optimized dosage was sought in order to maximize the percentage of porosity while achieving the lowest thermal conductivity. According to the results obtained, the statistical method successfully predicted the effects of variables on the final properties. Hence, a model that explains the overall behaviour of the system was successfully attained. The obtained model predicts the porosity and the thermal conductivity of sust-MPC by means of the mixture dosage. Consequently, the present work demonstrates that it is possible to control the porosity in order to diminish thermal conductivity. Keywords Insulation; building material; design of experiments; MPC; porosity; thermal conductivit

The development and testing of a parametric sonar system for use in sediment classification and the detection of buried objects

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN032706 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Synergistic effect of the parameters affecting wet flue gas desulfurization using magnesium oxides by-products

A previous study carried out by the authors allowed to identify the optimum MgO by-product for a 100% SO2 removal efficiency in a wet flue gas desulfurization (FGD) process. The present research analyzes the synergistic effect between the main parameters affecting the proposed desulfurization process. The design of experiments (DoE) was used as statistical tool for evaluating the influence of the solid-to-water ratio (S/W), water (W) and time of reaction (tR) over the most important responses of the FGD process: Mg2+, Ca2+ and SO42- in solution, pH and conductivity (k), and time of saturation (tS). According to the analysis performed, the results of Mg2+ and Ca2+ leaching showed the greater effect of Mg compounds. The production of SO42- was simultaneously affected by S/W and W, due to the mass-transfer nature of the process. The pH range was found to be controlled by the solubility product of the alkaline phases while k showed a linear dependency on the dissolution of the solid and SO2 absorption. As for desulfurization efficiency, two behaviors were observed by the combined effect of the factors: low S/W ratios in the whole W range showed that adding more solid had a positive effect as it increased tS while higher ratios decreased it. Hence, an optimum S and W consumption for 100% removal efficiency can be estimated in sake of saving energy, W and by-product. The present research methodology could be extended to other by-products for wet FGD as the current EU legislation is driving the industry to the reutilization of wastes and residues.Peer ReviewedPostprint (published version