Szczegóły publikacji
Opis bibliograficzny
Thermal conductivity analysis of porous NiAl materials manufactured by spark plasma sintering: experimental studies and modelling / Szymon Nosewicz, Grzegorz Jurczak, Tomasz Wejrzanowski, Samih Haj Ibrahim, Agnieszka Grabias, Witold Węglewski, Kamil Kaszyca, Jerzy Rojek, Marcin Chmielewski // International Journal of Heat and Mass Transfer ; ISSN 0017-9310. — 2022 — vol. 194 art. no. 123070, s. 1–19. — Bibliogr. s. 18–19, Abstr. — Publikacja dostępna online od: 2022-05-31. — K. Kaszyca - afiliacja: Lukasiewicz Research Network, Institute of Microelectronics and Photonics
Autorzy (9)
- Nosewicz Szymon
- Jurczak Grzegorz
- Wejrzanowski Tomasz
- Haj Ibrahim Samih
- Grabias Agnieszka
- Węglewski Witold
- Kaszyca Kamil
- Rojek Jerzy
- Chmielewski Marcin
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 149664 |
|---|---|
| Data dodania do BaDAP | 2023-10-19 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.ijheatmasstransfer.2022.123070 |
| Rok publikacji | 2022 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | International Journal of Heat and Mass Transfer |
Abstract
This work presents a comprehensive analysis of heat transfer and thermal conductivity of porous mate- rials manufactured by spark plasma sintering. Intermetallic nickel aluminide (NiAl) has been selected as the representative material. Due to the complexity of the studied material, the following investigation consists of experimental, theoretical and numerical sections. The samples were manufactured in differ- ent combinations of process parameters, namely sintering temperature, time and external pressure, and next tested using the laser flash method to determine the effective thermal conductivity. Microstructural characterisation was extensively examined by use of scanning electron microscopy and micro-computed tomography (micro-CT) with a special focus on the structure of cohesive bonds (necks) formed during the sintering process. The experimental results of thermal conductivity were compared with theoretical and numerical ones. Here, a finite element framework based on micro-CT imaging was employed to anal- yse the macroscopic (effective thermal conductivity, geometrical and thermal tortuosity) and microscopic parameters (magnitude and deviation angle of heat fluxes, local tortuosity). The comparison of different approaches toward effective thermal conductivity evaluation revealed the necessity of consideration of additional thermal resistance related to sintered necks. As micro-CT analysis cannot determine the parti- cle contact boundaries, a special algorithm was implemented to identify the corresponding spots in the volume of finite element samples; these are treated as the resistance phase, marked by lower thermal conductivity. Multiple simulations with varying content of the resistance phase and different values of thermal conductivity of the resistance phase have been performed, to achieve consistency with experi- mental data. Finally, the Landauer relation has been modified to take into account the thermal resistance of necks and their thermal conductivity, depending on sample densification. Modified theoretical and finite element models have provided updated results covering a wide range of effective thermal conduc- tivities; thus, it was possible to reconstruct experimental results with satisfactory accuracy.