Cold sintering of ceramics and glasses: A review

Vakifahmetoğlu, Çekdar; Karacasulu, Levent

doi:10.1016/j.cossms.2020.100807

Cited by 85 publications

(43 citation statements)

References 242 publications

(174 reference statements)

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“…The ZnO phase was indexed as a trigonal structure (ICSD 290322) and the BT phase as a tetragonal perovskite structure (ICSD 259052). BT samples produced by CSP are reported to present a cubic structure [6]. As expected, we identified in Fig.…”

Section: Methodssupporting

confidence: 84%

“…Some authors tend to separate the cold sintering into a two-stage process. In stage I, the compaction occurs by uniaxial mechanical force with enhanced lubricity between particles due to the liquid, and in stage II, the temperature is elevated under constant pressure and the solubility is enhanced [6,7]. During stage I, ~60% of density is expected for the compacted powder [12].…”

Section: Methodsmentioning

confidence: 99%

“…For many oxide materials, the sintering temperature is above 1000 °C, which consumes energy and generally requires sophisticated experimental apparatus [1,2]. Previous studies have documented strategies for sintering ceramics at low temperatures, as reactive hydrothermal liquid-phase sintering [3,4], room temperature densification [5], and hydrothermal hot pressing [6]. Recently, researchers have proposed a new methodology for the sintering of ceramic compounds called the cold sintering process (CSP) [2,[7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The solubility of the powder in the liquid used in CSP is typically obtained by partial solubilization of particles [4]. However, it can be achieved by the addition of different chemical groups [6]. The mechanisms operating during CSP are not limited to the dissolution and reprecipitation process.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of the liquid facilitates the rotation and rearrangement of grains under pressure and increase the initial density of the compact [2]. Besides, it has been reported the formation of secondary phases and lattice disorder on the powder surface [4,6].…”

Section: Introductionmentioning

confidence: 99%

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Cold sintering and electric characterization of ZnO-BaTiO3 composites

2021

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The sintering is an essential step in the processing of ceramics materials. A number of researchers have reported new techniques for sintering. However, in general, the process still demands high temperatures. This paper reports the results of the cold sintering of ZnO-BaTiO 3 composites. The microstructural, structural, and electric properties of the composite were studied. We obtained high densities (>95%) for pure ZnO and for the composition with 10 wt% of BaTiO 3 at a low temperature of sintering (250 °C/1 h). The increase of BaTiO 3 content reduced the grain size and degraded the sinterability of ZnO. The crystalline structure was investigated by X-ray diffraction and confirmed the separation of the phases after the cold sintering. The BaTiO 3 added in the composite reduced the values of conductivity, permittivity, and also the dielectric loss.

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Section: Methodssupporting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cold sintering and electric characterization of ZnO-BaTiO3 composites

2021

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Stereolithographically 3D Printed SiC Metastructure for Ultrabroadband and High Temperature Microwave Absorption

Zhou

Zhang

Wang

et al. 2022

Adv Materials Technologies

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and attracted tremendous attentions, due to their wide applications in civil fields such as communication devices and aerospace vehicles. [1][2][3] On one hand, owing to the great detection technique progress achieved in the frequency region from 2 to 40 GHz with wavelength on a millimeter scale, materials with ultrabroadband microwave absorption capability covering more than four bands are highly pursued. [4][5][6][7] On the other hand, considering components and devices always work at elevated temperatures more than 1000 °C especially for aerospace vehicle applications, materials with high-temperature microwave absorption and high mechanical performance are also urgently required. [8][9][10][11] Dielectric absorption ceramics, [12][13][14] especially SiC ceramic, [15][16][17][18] are highlighted on the basis of their advantages of chemical stability, high temperature resistance, and thermal stability, which make them potential candidates for ultrabroadband and high temperature microwave absorption applications. However, the major challenge of the SiC ceramic microwave absorber like many other singlecomponent ceramic absorbents, is lack of structural designs and optimization with a low reflection profile. [4,[19][20][21] Recently, several approaches, involving uniform electrical porous lossy ceramics [22][23][24] and artificial metastructures, [25][26][27] have been proved to be effective for designing and fabricating ultrabroadband microwave absorption materials. Particularly, ceramic metastructures open a new opportunity for microwave absorption by designing the artificial periodic patterned structure configurations, and finally creating multiple absorption peaks along with additional microwave scattering based on structural influence, leading to broadband absorption. [28,29] However, these artificial ceramic metastructures are usually complex-shaped in geometries, and it is extraordinarily difficult to obtain ceramic metastructures through traditional ceramic processing and manufacturing technologies, such as powder sintering [30,31] and colloidal processing. [32,33] It is therefore highly desirable to develop an advanced and versatile technique for achieving the microwave absorbing ceramic metastructure. Broadband microwave absorption is essential on the realms of electromagnetic compatibility and protection in civil applicationscenarios. However, coordination of material and structure is difficult without proper iterative design between material and structure resulting in insurmountable drawbacks of traditional microwave absorption medium operating under high temperature erosion. Herein, SiC metastructure is manufactured in bulk by stereolithographic 3D printing. The dielectric loss tangent of SiC sintered body is over 0.5 and up to 1.5 at most showing good electromagnetic energy dissipation properties. The optimized SiC metastructure with complicated suspended features achieves −10 dB broadband microwave absorption from 6.96 to 40 GHz at room temperature (RT) across total frequency range of 33.04 GHz. The ...

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Toward Ecofriendly Piezoelectric Ceramics—Reduction of Energy and Environmental Footprint from Conceptualization to Deployment

Anandakrishnan,

Yadav,

Tabeshfar

et al. 2023

Global Challenges

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Piezoelectric materials are widely used in electromechanical coupling components including actuators, kinetic sensors, and transducers, as well as in kinetic energy harvesters that convert mechanical energy into electricity and thus can power wireless sensing networks and the Internet of Things (IoT). Because the number of deployed energy harvesting powered systems is projected to explode, the supply of piezoelectric energy harvesters is also expected to be boosted. However, despite being able to produce green electricity from the ambient environment, high‐performance piezoelectrics (i.e., piezoelectric ceramics) are energy intensive in research and manufacturing. For instance, the design of new piezoceramics relies on experimental trials, which need high process temperatures and thus cause high consumption and waste of energy. Also, the dominant element in high‐performance piezoceramics is hazardous Pb, but substituting Pb with other nonhazardous elements may lead to a compromise of performance, extending the energy payback time and imposing a question of trade‐offs between energy and environmental benefits. Meanwhile, piezoceramics are not well recycled, raising even more issues in terms of energy saving and environmental protection. This paper discusses these issues and then proposes solutions and provides perspectives to the future development of different aspects of piezoceramic research and industry.

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Cold sintering of ceramics and glasses: A review

Cited by 85 publications

References 242 publications

Cold sintering and electric characterization of ZnO-BaTiO3 composites

Cold sintering and electric characterization of ZnO-BaTiO3 composites

Stereolithographically 3D Printed SiC Metastructure for Ultrabroadband and High Temperature Microwave Absorption

Toward Ecofriendly Piezoelectric Ceramics—Reduction of Energy and Environmental Footprint from Conceptualization to Deployment

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