A complex approach to assessing porous structure of structured ceramics obtained by SPS technique

Папынов, Е. К.; Modin, E.B.; Mayorov, V. Yu.; Shichalin, O.O.; Голиков, А. П.; Pechnikov, V. S.; Гридасова, Е. А.; Тананаев, И. Г.; Авраменко, В. А.

doi:10.1016/j.matchar.2018.08.044

Cited by 58 publications

(19 citation statements)

References 26 publications

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“…In this regard, recently, methods of fast densification (shrinkage) of powders have become very popular. One of the more discussed methods in this series is Spark Plasma Sintering (SPS) [ 13 , 14 , 15 , 16 , 17 ]. This technology provides a high level of control of the sintering process under constant pressure and high heating rates (10–1000 °C/min) [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

et al. 2022

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The article presents the results of the investigation of the mechanism of the densification behavior of alumina-based ceramics during spark plasma sintering. The role of the heating rates and additives were investigated. The first (initial) stage of sintering was investigated by the Young–Cutler model. The second (intermediate) stage of sintering was investigated as a process of plastic deformation of a porous body under external pressure. It was shown that, at the initial stage, the formation of necks between the particles is controlled by grain boundary diffusion (the activation energy is Qb ≈ 20 kTm). At this stage, accommodation of the shape of the alumina particles is also occurring (an increase in the packing density). The accommodation process facilitates the shrinkage of the powder, which is reflected in a decrease in the effective activation energy of shrinkage at low heating rates (10 °C/min) to Qb ≈ 17 kTm. At heating rates exceeding 10 °C/min, the intensity of the processes of accommodation of alumina particles turns out to be much slower than the existing diffusion processes of growth of necks between the alumina particles. It was shown that the grain boundary sliding mechanism that occurs in the second stage of sintering can play a decisive role under conditions of spark plasma sintering with a high heating rate. The found value of the activation energy at the second stage of sintering is also close to the activation energy of grain–boundary diffusion of alumina (Qb ≈ 20 kTm). The influences of the second phase particles of MgO, TiO2, and ZrO2 on densification behavior of alumina-based ceramics were investigated. Since at the first stage of sintering the densification relates with the formation of necks between the particles of alumina, the additives (0.5% vol) have no noticeable effect on this process. It was also shown that the second phase particles which are located at the grain boundaries of alumina are not involved in the slip process during the second sintering stage. Analysis shows that additives act only in the final (third) stage of spark plasma sintering of alumina.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

et al. 2022

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“…N 2 adsorption-desorption isotherms of SBA15 and MCM-41 samples were collected at 77 K on ASAP 2020 HD88 (Micromeritics). The specific surface area was calculated by Brunauer-Emmett-Teller (BET) method [22], pore volume and pore size distribution were calculated by BJH method [23].…”

Section: Methodsmentioning

confidence: 99%

Systematic Investigation of the Synergistic and Antagonistic Effects on the Removal of Pyrene and Copper onto Mesoporous Silica from Aqueous Solutions

Zhai

Chen³

et al. 2019

Materials

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Polycyclic aromatic hydrocarbons (PAHs) and heavy metals have attracted greater attention due to their single or complex risks. It is urgent to find useful methods to remove these two pollutants together. In this study, SBA15 and MCM-41 were selected and used for the simultaneous removal of pyrene and copper from aqueous solution. Batch experiments were conducted systematically by investigating the adsorption behavior and effects including kinetics, isotherms, ionic strength and pH effects. Experimental results showed that the Langmuir and pseudo-second-order model fitted the adsorption behavior better. The solution pH values and ionic strength affected the adsorption behavior greatly. Furthermore, the synergistic or antagonistic effects could be observed on the adsorption of pyrene and copper onto MCM-41 and SBA15, respectively. The synergistic and antagonistic effects of pyrene and copper onto mesoporous silica may be attributed to the size of pyrene–copper complex and the average pore size of adsorbents. With the higher pore size, the complex would be adsorbed onto the inner surface of MCM-41 which showed synergistic effect on the adsorption of pyrene and copper. This study shows new guidelines and insight into the study of adsorption behavior of PAHs and heavy metals from aquatic environments.

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“…[14,[83][84][85] method and the ceramics exposure times to the high temperature. Here, the SPS or Spark Plasma Sintering allows for the explosion time reduction, the process costs reduction, and for smooth regulation of the thermal device influence, among others, on the phase compositions and surface roughness of ceramics [82]. The thermal modification basically occurs as a modification associated with other methods, primarily applying layers of e.g., silicon, magnesium, graphene, or as a finishing cloth for chemical etching mostly with hydrofluoric acid [83].…”

Section: Thermal Treatmentmentioning

confidence: 99%

Surface modification methods of ceramic filler in ceramic-carbon fibre composites for bioengineering applications – A systematic review

Nakonieczny

Antonowicz

Paszenda

2020

Reviews on Advanced Materials Science

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The present review paper focuses on the current state of the art of the alumina-silicate ceramics and surface modifications of ceramics dedicated as fillers in composites with carbon fiber. The use of aluminum-silicates in the form of a cenosphere due to their outstanding properties, i.e., low density, high hardness, and total chemical inertness seem to be promising in biomaterial engineering applications. First of all, the possibilities of the composites application in orthopedic and prosthetic implantology. The following section discusses problems with the use of aluminum silicate ceramics and their processing. Subsequently, in the paragraphs to follow, the possibilities of modifying the surface with chemical methods are discussed, among others oxidation, chemical methods like ionic liquids etching, silanization, and physical processes i.e., thermal treatment. In the summary, the directions of development of ceramic-carbon fiber composites and the primary deficiencies of these composites on which to focus on and solve are discussed.

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A complex approach to assessing porous structure of structured ceramics obtained by SPS technique

Cited by 58 publications

References 26 publications

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

Investigation of the Densification Behavior of Alumina during Spark Plasma Sintering

Systematic Investigation of the Synergistic and Antagonistic Effects on the Removal of Pyrene and Copper onto Mesoporous Silica from Aqueous Solutions

Surface modification methods of ceramic filler in ceramic-carbon fibre composites for bioengineering applications – A systematic review

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