Thermal conductivity analysis of porous NiAl materials manufactured by spark plasma sintering: Experimental studies and modelling

Nosewicz, Szymon; Jurczak, G.; Wejrzanowski, Tomasz; Ibrahim, S. H.; Grabias, A.; Węglewski, Witold; Kaszyca, Kamil; Rojek, Jerzy; Chmielewski, Marcin

doi:10.1016/j.ijheatmasstransfer.2022.123070

Cited by 16 publications

(19 citation statements)

References 69 publications

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“…Next, the samples were devoted to electron backscatter diffraction testing. Generally, due to its two-dimensional nature, the EBSD technique suffers from a limited amount of data obtained from the analysis of a single surface, as we compare it to 3D testing, such as micro-CT. [10] To study the effect of various planes to direction of the electric current and the external pressure application on the structural features of the EBSD maps (see Figure 2), the sample surfaces were extracted from perpendicular (samples 1, 3, 4, and 6) and parallel planes (samples 2 and 5). Such distinction allows us to obtain a better overview of the sample's microstructure and grain properties.…”

Section: A Experimental Techniques-manufacturing and Ebsd Mappingmentioning

confidence: 99%

“…As the q RSE stabilizes, i.e., the fluctuation of parameter in the function of RSE size is definitely reduced, the relevant RSE size is found. [10] Along with the RSE study, the homogeneity of the structure was checked by application of local surface element (LSE). It aims to study the material densification at the microscopic level using the local surface fraction, q LSE , within the circular-shape domain (Figure 3), similar to the approach reported in Reference 41.…”

Section: B Evaluation Of the Microstructural Grain Propertiesmentioning

confidence: 99%

“…vector with respect to the central axis of heat flow. [10] The proposed thermal analysis can be treated as the complementary study of the sintered NiAl microstructure. The determined structural features, especially the grain contacts and boundaries, were combined with the results from the numerical simulation.…”

Section: Ebsd-based Finite Element Framework Of Heat Conductionmentioning

confidence: 99%

“…[8] The knowledge of the microstructural parameters and their effect on the physical behaviour of nonhomogeneous sintered materials is crucial to predict or intentionally tailor the microstructure for the desired mechanical [9] or thermal properties. [10] A precise description of such a complicated sintered structure requires specific and advanced tools, both numerical and experimental. Numerical simulations at the microscopic level may provide an alternative tool for the determination of macro-and microscopic properties of a sintered material, [11] however, hardly any work on the simulation of SPS processes at the microscopic level can be found.…”

Section: Introductionmentioning

confidence: 99%

“…Basically, backscattered electrons carry much more information about the structure, e.g., crystallographic orientation or phase, so we are able to distinguish between grains or phases within the sample, identify interfaces, etc. [25,26] Different from micro-computed tomography (micro-CT), [10,27,28] EBSD allows determining effectively several microstructural parameters, such as grain geometry, particles and voids, grain-grain interfaces (boundary), grain morphology within particles or/and grains misorientation. Despite several advantages of the proposed methodology, EBSD investigation of sintered materials suffers also from a few limitations and deficiencies, such as the locally insufficient quality of the prepared sample surface (especially in the case of brittle and porous materials) and, hence, the several unsolved spots of the sample surface during the EBSD analysis, which may interfere the real representation of material microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

Nosewicz

Jurczak

Chromiński

et al. 2022

Metall Mater Trans A

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The paper presents the experimental, numerical, and theoretical investigation of the microstructure of nickel aluminide samples manufactured by spark plasma sintering using electron backscatter diffraction and computer assisted software. The aim of the work was to reveal the evolution of the microscopic and macroscopic parameters related to the microstructure of the material and its dependence on the applied sintering parameters—temperature and pressure. The studied porous samples with different relative density were extracted from various planes and then tested by electron backscatter diffraction to evaluate the crystallographic orientation in every spot of the investigated area. On this foundation, the grain structure of the samples was determined and carefully described in terms of the grain size, shape and boundary contact features. Several parameters reflecting the grain morphology were introduced. The application of the electric current resulting in high temperature and the additional external loading leads to the significant changes in the structure of the porous sample, such as the occurrence of lattice reorientation resulting in grain growth, increase in the grain neighbours, or the evolution of grain ellipticity, circularity, grain boundary length, and fraction. Furthermore, the numerical simulation of heat conduction via a finite element framework was performed in order to analyse the connectivity of the structures. The numerical results related to the thermal properties at the micro- and macroscopic scale—local heat fluxes, deviation angles, and effective thermal conductivity—were evaluated and studied in the context of the microstructural porosity. Finally, the effective thermal conductivity of two-dimensional EBSD maps was compared with those obtained from finite element simulations of three-dimensional micro-CT structures. The relationship between the 2D and 3D results was derived by using the analytical Landauer model.

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Section: A Experimental Techniques-manufacturing and Ebsd Mappingmentioning

confidence: 99%

Section: B Evaluation Of the Microstructural Grain Propertiesmentioning

confidence: 99%

Section: Ebsd-based Finite Element Framework Of Heat Conductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

Nosewicz

Jurczak

Chromiński

et al. 2022

Metall Mater Trans A

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Fracture‐Resistant and Thermally Insulating Ultrahigh‐Temperature Carbide Foams

Nisar,

Lopez,

Thomas

et al. 2023

Adv Eng Mater

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Dense ultra‐high temperature carbides (UHTCs) are recognized as potential materials for thermal protection systems (TPS) owing to properties beyond existing structural materials’ capabilities. Recent advances in the fabrication of UHTCs have enabled the development of multiscale porous microstructure. The present study highlights no longer the porosity in UHTCs will be treated as a defect but as a functional property specifically tailored for thermal insulation. It is a promising solution to design and fabricate bulk UHTC foams via a freeze‐drying (FD) approach followed by calibrated pressureless spark plasma sintering (PSPS). Herein, monolithic TaC and HfC UHTC foams and their composite show the partial solid‐solution formation of (Ta, Hf)C with porosity ≥ 50%. TaC‐HfC foam (∽80 to 92 N) showed an intermediate load‐bearing capability compared to monolithic TaC (∽120 to 135 N) and HfC (∽28 to 35 N) foams, with no evident cracking on the sample surface. The thermal conductivity of partial solid‐solution TaC‐HfC foam increased up to 5‐fold compared to parent UHTC foams. The results illustrate solid solutions’ efficacy and pores’ unidirectionality in providing thermal insulation to TaC‐HfC while maintaining its high‐load bearing capability. The developed technique will establish a new paradigm shift in UHTCs, expanding their potential for TPS in extreme environments.This article is protected by copyright. All rights reserved.

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Discrete element model for effective electrical conductivity of spark plasma sintered porous materials

Nisar,

Rojek,

Nosewicz

et al. 2024

Comp. Part. Mech.

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This paper aims to analyse electrical conduction in partially sintered porous materials using an original resistor network model within discrete element framework. The model is based on sintering geometry, where two particles are connected via neck. Particle-to-particle conductance depends on neck size in sintered materials. Therefore, accurate evaluation of neck size is essential to determine conductance. The neck size was determined using volume preservation criterion. Additionally, grain boundary correction factor was introduced to compensate for any non-physical overlaps between particles, particularly at higher densification. Furthermore, grain boundary resistance was added to account for the porosity within necks. For numerical analysis, the DEM sample was generated using real particle size distribution, ensuring a heterogeneous and realistic microstructure characterized by a maximum-to-minimum particle diameter ratio of 15. The DEM sample was subjected to hot press simulation to obtain geometries with different porosity levels. These representative geometries were used to simulate current flow and determine effective electrical conductivity as a function of porosity. The discrete element model (DEM) was validated using experimentally measured electrical conductivities of porous NiAl samples manufactured using spark plasma sintering (SPS). The numerical results were in close agreement with the experimental results, hence proving the accuracy of the model. The model can be used for microscopic analysis and can also be coupled with sintering models to evaluate effective properties during the sintering process.

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Thermal conductivity analysis of porous NiAl materials manufactured by spark plasma sintering: Experimental studies and modelling

Cited by 16 publications

References 69 publications

Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

Fracture‐Resistant and Thermally Insulating Ultrahigh‐Temperature Carbide Foams

Discrete element model for effective electrical conductivity of spark plasma sintered porous materials

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