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Virtual poster session

In-situ observation of combustion foaming process for synthesizing porous Al3Ti by X-ray radioscopy

Wednesday (07.10.2020)
19:22 - 19:25 Room 1
Part of:
Line-Up:
18:40 Virtual poster session Development of CFRP - hybrid foam composites for improved light-weight design of electric vehicles 1 Joachim Baumeister
18:43 Virtual poster session Study of the thermal conductivity of powdered microcellular polymers based on PMMA 1 Ph.D. Ismael Sánchez
18:46 Virtual poster session Manufacturing of functional aluminium matrix syntactic foams 1 Alexandra Kemény
18:49 Virtual poster session Manufacturing and comparison of AlSi12 matrix unimodal and bimodal syntactic metal foams 1 Borbála Leveles
18:52 Virtual poster session The effect of elastomer viscosity in pp/poe foams produced by core-back injection moulding over impact properties 1 Ph.D. Santiago Muñoz Pascual
18:55 Virtual poster session Modelling of the mechanisms of heat transfer in glass foams at different temperatures 1 Paula Cimavilla-Román
18:58 Virtual poster session Thermal conductivity of polyisocyanurate foams (PIR) produced using hydrofluoroolefins (HFOs) as blowing agents 1 Ph.D. Patricia Torres
19:01 Virtual poster session Multiscale modeling of biopolymer aerogels 1 Dr.-Ing. Ameya Rege
19:04 Virtual poster session On the way to mass production of unit-cell based auxetic materials 1 Angela Schwarz
19:07 Virtual poster session Wavy knits – enabling the production of auxetic materials 1 Angela Schwarz
19:10 Virtual poster session Influence of Sample Size on Dynamic Compression of Metal Syntactic Foams 1 Nima Movahedi
19:13 Virtual poster session Synthesis of new non-isocyanate polyurethane foams based on cyclic triscarbonates and diamines 1 Ph.D. Mercedes Santiago-Calvo
19:16 Virtual poster session Formation of monodisperse surfactant foams 1 Prof. Dr. Rumen Krastev
19:19 Virtual poster session Analysis of a AlMg2.5 matrix syntactic foam produced via thixoinfiltration of loosely packed and micro structured recycled balloons 1 João Paulo Paschoal
19:22 Virtual poster session In-situ observation of combustion foaming process for synthesizing porous Al3Ti by X-ray radioscopy 1 Takamasa Inukai
19:25 Virtual poster session Characterization of 3D printed PHBV+BG scaffolds for bone regeneration 1 Prof. Dr. Elida B. Hermida
19:28 Virtual poster session Rheology of a hydrogel-ink, printing fidelity and elastic behavior of 3D-printed scaffolds 1 Prof. Dr. Elida B. Hermida
19:31 Virtual poster session Keratinocytes hacat proliferation on 3D-printed chitosan-collagen scaffolds 1 Prof. Dr. Elida B. Hermida
19:34 Virtual poster session The microhardness and microstructure studies on the sintered open-cell nickel foam 0 Faeze Barzegar
19:37 Virtual poster session Characterization of porous titanium implants produced by 3D printer technique 0 Dr. Akram Salehi
19:40 Virtual poster session Adapting polymer derived ceramic membranes for emulsification process 1 Natália Cristina Fontão
19:43 Virtual poster session Poster discussion in video chat rooms 0
Session Chair


Session V.1: Session 1
Belongs to:
General Topic V: Virtual poster session


Porous metals include a lot of pores inside the materials. Due to the pores, they exhibit unique properties such as light weight, low thermal conductivity. We developed a combustion foaming process using strong exothermic reactions of elemental powder, which enables us to fabricate closed-cellular porous intermetallic compounds with high melting temperatures. Heating a precursor composed of powder mixture of Al, Ti, and B4C facilitates two chemical reactions occurring at the melting temperature of Al: 3Al + Ti → Al3Ti and 3Ti + B4C → 2TiB2 + TiC. These exothermic reactions significantly rise the sample temperature above the melting point of Al3Ti (approximately 1340C). Concurrently, impurity elements dissolved in the Al powder or absorbed on the Al surface can be released as gases, resulting in foaming of the precursor. The extremely rapid and irreversible process of the combustion foaming makes it much difficult to understand the foaming process, whereas it is required to understand its detailed process for controlling fine and uniform cell structures of the produced foams. In the present study, we made an attempt to in-situ observe the combustion foaming behaviors in synthesizing the porous Al3Ti by X-ray radioscopy. The in-situ observations revealed that the combustion foaming process consisted of four steps: (1) gradual expansion in heating, (2) temporary steady state at a constant volume, (3) a slight shrinkage, and (4) significant foaming. After that, the foam sample was contracted drastically while coarsening bubbles in cooling process, resulting in the formation of inhomogeneous and coarse pore morphologies In order to elucidate the chemical reactions arising at each step, heating of the sample was interrupted at different steps. The results of microstructural observations for the interrupted samples will be presented to discuss a change in microstructure inside the precursor during the combustion foaming process.

Speaker:
Takamasa Inukai
Nagoya University
Additional Authors:
  • Dr. Asuka Suzuki
    Nagoya University
  • Prof. Naoki Takata
    Nagoya University
  • Prof. Makoto Kobashi
    Nagoya University
  • Yuji Okada
    TOYOTA MOTOR CORPORATION
  • Yuichi Furukawa
    TOYOTA MOTOR CORPORATION

Dateien

Category Short file description File description File Size
Presentation ver.1 Porous metals include a lot of pores inside the materials. Due to the pores, they exhibit unique properties such as light weight, low thermal conductivity. We developed a combustion foaming process using strong exothermic reactions of elemental powder, which enables us to fabricate closed-cellular porous intermetallic compounds with high melting temperatures. Heating a precursor composed of powder mixture of Al, Ti, and B4C facilitates two chemical reactions occurring at the melting temperature of Al: 3Al + Ti → Al3Ti and 3Ti + B4C → 2TiB2 + TiC. These exothermic reactions significantly rise the sample temperature above the melting point of Al3Ti (approximately 1340C). Concurrently, impurity elements dissolved in the Al powder or absorbed on the Al surface can be released as gases, resulting in foaming of the precursor. The extremely rapid and irreversible process of the combustion foaming makes it much difficult to understand the foaming process, whereas it is required to understand its detailed process for controlling fine and uniform cell structures of the produced foams. In the present study, we made an attempt to in-situ observe the combustion foaming behaviors in synthesizing the porous Al3Ti by X-ray radioscopy. The in-situ observations revealed that the combustion foaming process consisted of four steps: (1) gradual expansion in heating, (2) temporary steady state at a constant volume, (3) a slight shrinkage, and (4) significant foaming. After that, the foam sample was contracted drastically while coarsening bubbles in cooling process, resulting in the formation of inhomogeneous and coarse pore morphologies In order to elucidate the chemical reactions arising at each step, heating of the sample was interrupted at different steps. The results of microstructural observations for the interrupted samples will be presented to discuss a change in microstructure inside the precursor during the combustion foaming process. 14 MB Download