Microstructure and properties of hot-pressed molybdenum-alumina composites

Chmielewski, Marcin; Dutkiewicz, J.; Kaliński, D.; Lityńska‐Dobrzyńska, Lidia; Pietrzak, K.; Strojny-Nędza, Agata

doi:10.2478/v10172-012-0074-8

Cited by 30 publications

(11 citation statements)

References 10 publications

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“…As well, Al 2 O 3 -Mo composite is described well [13]. Chmielewski et al [2] revealed experimental procedure to obtain Al 2 O 3 -Mo characterized by high density and very stable bonding between ceramic and metal phase. Nawa et al [14] revealed that fracture toughness of Al 2 O 3 with 20 vol% Mo fabricated by the hot-pressed composite is 1.8 times larger than the samples consisted of monolithic Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 85%

“…The current literature knowledge indicates that hybrid composites can be obtained using a variety of methods. The most popular techniques for obtaining ceramic-metal composites are as follows: slip casting [1], hot pressing [2], electro-discharge compaction (EDC) [3], field-assisted sintering technique (FAST) [4], spark plasma sintering (SPS) [5,6], and pulse plasma compaction (PPC) [7]. The Al 2 O 3 -Cu composite reveals high strength, high electric, and thermal conductivity with additional high wear resistance.…”

Section: Introductionmentioning

confidence: 99%

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Thermoanalytical and dilatometric studies of the Al2O3–Cu–Mo hybrid composite

Zygmuntowicz

Piątek

Wachowski

et al. 2020

J Therm Anal Calorim

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The present research is focused on the characterization of the composites from Al 2 O 3-Cu-Mo system. The composites were prepared by slip casting method and subsequent sintering of green bodies in a reduced atmosphere. Two series of samples with different volume content of metallic powders were produced in the work: 10 vol% and 15 vol% of metal content with respect to the total solid-phase content. The sintering process of the composites was analyzed in detail. The linear shrinkage of the composites was measured. The shrinkage curves were obtained by dilatometry test in a heating mode. The composites were characterized by DTA/TG analyses and thermal conductivity. The composites were characterized by XRD, SEM, and EDX. The hardness was measured by Vickers hardness tester. Moreover, the Brazilian test was performed to determine the tensile mechanical properties of the composites. Fractography investigation was carried out as well. Dilatometric tests showed that the increase of the metallic phase volume in the ceramic matrix causes a decrease in the starting temperature of densification. Simultaneously, dilatometric experiments indicated that an increasing amount of metallic particles into the ceramic matrix increases the temperature of maximum densification and decreases the total shrinkage of the composites during sintering. The DTA/TG showed the characteristics of the dispersant decomposition to the atmosphere during thermal treatment and increase of mass connected with the oxidation of metals. Fractography results revealed good adhesion between Al 2 O 3 matrix and the metallic phase. The observation allowed to conclude that the Al 2 O 3 matrix surface is characterized by the brittle fracture mechanism.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Thermoanalytical and dilatometric studies of the Al2O3–Cu–Mo hybrid composite

Zygmuntowicz

Piątek

Wachowski

et al. 2020

J Therm Anal Calorim

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“…In the first one, materials are joined directly, but in such cases possible pairs of the materials are significantly limited. In this area, Chmielewski et al [15] presented the experiments concerning a manufacturing process of Mo-Al 2 O 3 composite materials obtained by the hot pressing method to overcome the problem of brittleness as the main technical limitation on a wide use of advanced ceramic materials. Lee et al [16] performed brazing joining of Al 2 O 3 -SUS304 with the conventional Ag-Cu eutectic filler metal by applying the surface modification techniques.…”

Section: Introductionmentioning

confidence: 99%

New approach of friction AlN ceramics metallization with the initial FEM verification

Cacko

Chmielewski

Hudycz

et al. 2020

Archiv.Civ.Mech.Eng

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Although, the friction method is well known for metals surface modification, the novelty of the article is based on the new idea of ceramics surface treatment with metal. The paper describes AlN ceramic metallization process by titanium coating deposition, obtained in friction surfacing method, which has been developed by the authors. The friction energy is directly transformed into heat and delivered in a specified amount precisely to the joint being formed between the metallic layer and the ceramics substrate material. The stress and temperature fields (as factors promoting the formation of diffusion joints) induced in the joint during the metallization process were qualitatively determined with the finite element method analysis and these results were verified experimentally. Finally, obtained structures of the metallic coatings were investigated and the results are discussed in the paper. As a novelty it was found, that the conditions of frictional metallization can favour the formation of a coating-substrate bond based on diffusion phenomena and atomic bonds of the coating components with the components of the substrate, despite the fact that it happens for metal–ceramics pairs. This type of connection is usually associated with long-term heating/annealing in chamber furnaces, because for diffusion in a solid state the most effective factor is time and temperature. It was shown that other components of the chemical potential gradient, such as temperature gradient, gradient and stress level, load periodicity and configuration of pairs of elements with high chemical affinity may play an important role in friction metallization. As a result, the relatively short time of operation (friction) is compensated.

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“…The improvement of alumina ductility can be achieved using powders such as nickel [5,6], magnesium [7], copper [8,9], iron [10], molybdenum [11], titanium [12], and so on. High ductility, good thermal stability at high temperature, and high corrosion resistance make nickel a suitable choice for metal-ceramic composite elaboration.…”

Section: Introductionmentioning

confidence: 99%

Structural and Morphological Evaluation of 25% vol. Ni/Al<sub>2</sub>O<sub>3</sub> Nanocomposite Powders Produced by Mechanical Milling

Voicu

Popa

Păşcuţă

et al. 2015

AEF

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Abstract. The evolution of the Al 2 O 3 /Ni (25% vol. Ni) composite powders, during the milling and the stability of the composite phases were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray microanalysis (EDX). SEM images show a high level of homogenization of the Ni and Al 2 O 3 phases for milling times larger than 120 minutes. The X-ray study indicates no reaction between the two phases. The crystallite grain size decreases with the milling time for both phases.

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Microstructure and properties of hot-pressed molybdenum-alumina composites

Cited by 30 publications

References 10 publications

Thermoanalytical and dilatometric studies of the Al2O3–Cu–Mo hybrid composite

Thermoanalytical and dilatometric studies of the Al2O3–Cu–Mo hybrid composite

New approach of friction AlN ceramics metallization with the initial FEM verification

Structural and Morphological Evaluation of 25% vol. Ni/Al<sub>2</sub>O<sub>3</sub> Nanocomposite Powders Produced by Mechanical Milling

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