Thermal conductivity of ceramic/metal composites from preforms produced by freeze casting

Hautcoeur, Dominique; Lorgouilloux, Yannick; Leriche, Anne; Gonon, Maurice; Naït-Ali, Benoît; Smith, David Stanley; Lardot, Véronique; Cambier, F.

doi:10.1016/j.ceramint.2016.06.016

Cited by 34 publications

(11 citation statements)

References 32 publications

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“…Regulation system using nitrogen flow control by an electrovalve Figure 1. Schematic of the freeze casting device [26].…”

Section: Nitrogen Flowmentioning

confidence: 99%

“…The micropore volume fraction in the ceramic walls, or wall microporosity, was evaluated from the measurement of acoustic wave velocity in the specimens [26]. The measurement principle assumed that the ceramic walls act as a wave guide.…”

Section: Nitrogen Flowmentioning

confidence: 99%

“…This work aims at establishing the relation between the porosity and the compressive strength for freeze cast anisotropic porous alumina ceramics. In a previous work, it has been assumed that a porosity gradient through the specimen might impact the porous ceramic characteristics [26]. Indeed, a ceramic/metal composite processed from a freeze cast porous preform exhibits a variation of the thermal conductivity through the specimen height, which can be explained by a modification of the metal volume fraction induced by a porosity gradient.…”

Section: Introductionmentioning

confidence: 99%

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Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression

et al. 2018

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The aim of the work is to analyse the mechanical behaviour of anisotropic porous alumina ceramics processed by freeze casting (ice templating). The freeze cast specimens were characterised by a lamellar structure with ellipsoidal pore shape, with a size ranging from 6 to 42 µm and 13 to 300 µm for the minor and major axes, respectively, as a function of the freezing rate and the powder and binder contents. The pore volume fraction ranged from 40 to 57%. SEM analysis of the porous structures after the compression test showed a typical deformation pattern caused by the porosity gradient through the specimen, as determined by X-ray radiography. The apparent elastic modulus of the anisotropic porous alumina ranged from 0.2 to 14 GPa and the compressive strength from 6 to 111 MPa, varying as a function of the process parameters which determine the pore network characteristics. The relationships between stress-strain behaviour in compression and the microstructure and texture were established. An analytical model based on a Gibson and Ashby relationship was used and adapted from SEM microstructural analysis after a mechanical test in order to predict the compressive strength of processed anisotropic alumina.

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“…Regulation system using nitrogen flow control by an electrovalve Figure 1. Schematic of the freeze casting device [26].…”

Section: Nitrogen Flowmentioning

confidence: 99%

Section: Nitrogen Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression

et al. 2018

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“…Shen et al [15] further investigated the microstructure evolution and mechanical properties of the lamellar Al 2 O 3 -ZrO 2 /Al-Si-Mg composites prepared by freeze-casting and pressure-less infiltration method, and revealed the reaction between Al-12Si-10Mg matrix and ZrO 2 to form (Al 1−m , Sim) 3 Zr, Al 2 O 3 and ZrSi 2 phases. Hautcoeur et al [16] fabricated the lamellar ZrO 2 /Al composites by freeze-casting and pressure-less infiltration method, and reported that the thermal conductivities of the composites were signifi-cantly anisotropic, which were 80 and 13 W/(m•K) parallel and perpendicular to the freezing direction, respectively.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and compressive behavior of lamellar Al₂O₃p/Al composite prepared by freeze-drying and mechanical-pressure infiltration method

Zhang¹,

Dong

et al. 2020

Science and Engineering of Composite Materials

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Infiltrated molten Al matrix by mechanical-pressure infiltration method into the ceramic scaffold prepared by freeze-drying technology could prepare dense lamellar Al matrix composites without damage of the biomimetic microstructure of the scaffold. However, the investigation of lamellar Al matrix composites prepared by freeze-drying and mechanical-pressure infiltration method has not been fully understood yet. In the present work, the Al2O3 scaffold with pearl layer structure was prepared by freezing-dry method, and eventually the lamellar Al2O3p/Al composite was fabricated by mechanical-pressure infiltration method. The Al matrix was infiltrated well into the large pores of the Al2O3 scaffold, and the lamellar structure of the Al2O3 was well preserved. The hardness of the lamellar Al2O3p/Al composite was isotropic in transvers and perpendicular directions. However, the compressive strengths of the lamellar Al2O3p/Al composite were significant anisotropic while the compressive strength in transvers direction was 127.7% higher than that in the perpendicular direction, indicating the integrality of the lamellae microstructure (especially the bridging layers). Due to the mismatched deformability, weak debonding was observed between Al and Al2O3p/Al layers in the fracture surface of the lamellar Al2O3p/Al composite. It indicates that the interfacial bonding between Al and Al2O3p/Al layers is rather strong, which is beneficial for higher strength in transvers direction but lead to lower strength in perpendicular direction.

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“…Metal/oksit kompozit malzeme üretmek için çok sayıda yöntem mevcuttur. Bu yöntemler arasında döküm [13], seçici korozyon [14], kimyasal indirgenme [15], elektrokaplama [16]…”

Section: Introductionunclassified

Synthesis of Fe3O4/FeO/CoNi composite material and study of its magnetic properties

KUNDURACI¹

2019

Pamukkale J Eng Sci

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Fe3O4/FeO/CoNikompozit malzemesi iki aşamalı proses kullanılarak üretilmiştir. Birinci aşamada, oksit prekürsörü (öncül malzeme) ıslak sentez esaslı Pechini yöntemi kullanılarak düşük sıcaklıkta üretilmiştir. İkinci aşamada prekürsör malzemesi 500, 600, 700 veya 800 °C'ye hidrojen gazı altında ısıtılarak indirgenmiştir ve metal/oksit kompozit malzemesi elde edilmiştir. Farklı sıcaklıklarda üretilen malzemelerin yapısal, morfolojik ve manyetik özellikleri X-ışını kırınımı, tarama elektron mikroskobu ve titreşen örnek manyetometresi kullanılarak incelenmiştir. 600 °C'den 700 °C'ye geçişte manyetik özelliklerde ani değişiklikler gözlenmiştir. Doygunluk mıknatıslanması iki katına çıkarken, koersif kuvvet yarıya inmiştir. Bu değişiklikler manyetik CoNi fazın amorf bir yapıdan kristal bir yapıya geçişiyle ve Fe3O4 fazın parçacık boyutunun yaklaşık olarak iki katına artmasıyla açıklanmıştır. Fe3O4/FeO/CoNi composite materials were produced using a two-step process. In the first step, oxide precursor was produced at low temperature by wet-synthesis based Pechini method. In the second step, the precursor was heated to 500, 600, 700 or 800 °C under reducing hydrogen gas and metal/oxide composite material was obtained. The structural, morphological and magnetic properties of materials produced at different temperatures were investigated using X-ray diffraction, scanning electron microscope and vibrating sample magnetometer. Sudden changes in magnetic properties were observed during transition from 600 °C to 700 °C. The saturation magnetization doubled while coercive force was halved. These changes were explained with the crystallization of magnetic CoNi phase from an amorphous state and nearly doubling of particle size of Fe3O4 phase.

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Thermal conductivity of ceramic/metal composites from preforms produced by freeze casting

Cited by 34 publications

References 32 publications

Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression

Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression

Microstructure and compressive behavior of lamellar Al₂O₃p/Al composite prepared by freeze-drying and mechanical-pressure infiltration method

Synthesis of Fe3O4/FeO/CoNi composite material and study of its magnetic properties

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Thermal conductivity of ceramic/metal composites from preforms produced by freeze casting

Cited by 34 publications

References 32 publications

Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression

Alumina Porous Ceramics Obtained by Freeze Casting: Structure and Mechanical Behaviour under Compression

Microstructure and compressive behavior of lamellar Al2O3p/Al composite prepared by freeze-drying and mechanical-pressure infiltration method

Synthesis of Fe3O4/FeO/CoNi composite material and study of its magnetic properties

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Microstructure and compressive behavior of lamellar Al₂O₃p/Al composite prepared by freeze-drying and mechanical-pressure infiltration method