Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Benavente, Rut; Salvador, M. D.; Moreno, Olga García; Peñaranda‐Foix, Felipe L.; Catalá-Civera, J.M.; Borrell, Amparo

doi:10.1111/ijac.12285

Cited by 25 publications

(30 citation statements)

References 32 publications

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“…The results show that this process starts at lower temperatures in the case of microwave heating, being this observation in accordance with previous studies [32]. The figure also shows different onset temperatures depending on the heating rate.…”

Section: Resultssupporting

confidence: 92%

In Situ Monitoring of Microwave Processing of Materials at High Temperatures through Dielectric Properties Measurement

et al. 2016

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Microwave-assisted processes have recognized advantages over more conventional heating techniques. However, the effects on the materials’ microstructure are still a matter of study, due to the complexity of the interaction between microwaves and matter, especially at high temperatures. Recently developed advanced microwave instrumentation allows the study of high temperature microwave heating processes in a way that was not possible before. In this paper, different materials and thermal processes induced by microwaves have been studied through the in situ characterization of their dielectric properties with temperature. This knowledge is crucial in several aspects: to analyze the effects of the microwave field on the reaction pathways; to design and optimize microwave-assisted processes, and to predict the behavior of materials leading to repeatable and reliable heating processes, etc.

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Section: Resultssupporting

confidence: 92%

In Situ Monitoring of Microwave Processing of Materials at High Temperatures through Dielectric Properties Measurement

et al. 2016

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“…47 Spark plasma sintering and microwave sintering are alternative approaches to obtain dense nanometric grains. Conventional high temperature sintering of ceramics leads to the formation of large sized high crystalline grains due to Ostwald ripening.…”

Section: F I G U R E 7 (A) Nitrogen Adsorption-desorption Isothermsmentioning

confidence: 99%

“…Conventional high temperature sintering of ceramics leads to the formation of large sized high crystalline grains due to Ostwald ripening. 47 Spark plasma sintering and microwave sintering are alternative approaches to obtain dense nanometric grains. RTP at high temperature can also be used to overcome the grain growth issue of conventional high temperature sintering.…”

Section: Heat Treated Samplesmentioning

confidence: 99%

Eggshell derived mesoporous biphasic calcium phosphate for biomedical applications using rapid thermal processing

Ganesan

Devaraj

Govindan³

et al. 2019

Int J Applied Ceramic Tech

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Biphasic calcium phosphate (BCP) has received much interest for making various bone substitutes since its physicochemical properties can be easily tailored by tuning its phase composition. Due to high temperature processing, it is hard to prepare BCP with nanoscale characteristics. In the present study, we have made an attempt to optimize the heat treatment parameters for the synthesis of BCP with nanoscale characteristics from eggshell derived hydroxyapatite (HA) through rapid thermal processing (RTP). To accomplish this, eggshell derived HA was prepared by wet precipitation method and subjected to RTP at 750°C and 1150°C for 3 and 10 minutes. For comparison we have also studied conventional calcination at 750°C and 1150°C for 3 hours. XRD, FTIR, SEM, EDX, HRTEM, and BET analyses were used to understand the effect of RTP and conventional calcination on eggshell derived HA. Our results indicate that eggshell derived HA on RTP at 1150°C for 3 minutes and 10 minutes can offer nanoscale BCP with good dissolution, bioactivity, cytocompatibility, and mesoporous nature. Hence, RTP can be a potential method to prepare BCP with nanoscale features for biomedical applications.

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“…Furthermore, in applications involving the joining of materials, the thermal expansion requires a fairly narrow compatibility to match the shrinkage, as in glass and glass-ceramic/metal systems for hermetic seals, laser tubes, electronic devices for measuring and monitoring, sealants for solid oxide fuel cells (SOFCs), and substrates used in microelectronic packaging on LTCC technology (low temperature co-fired ceramics) [15][16][17][18][19] . In previous works 20,21 it was demonstrated that the addition of nanosized alumina in a LZS glass-ceramic matrix, produced by conventional sintering, was able to reduce the CTE significantly.…”

Section: Introductionmentioning

confidence: 99%

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

et al. 2017

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In this work, nanometric Al 2 O 3 (1-5 vol.%) particles (13 nm, 100 m 2 /g) were added to a 19.58Li 2 O•11.10ZrO 2 •69.32SiO 2 (mol%) (3.5 µm, 2.5 m 2 /g) parent glass-ceramic matrix to prepare composites with the purpose of studying the influence of Al 2 O 3 on their structure, microstructure, mechanical, thermal and electrical properties when sintered by fast firing. The parent glass-ceramic was prepared by melting and fast cooling (in water) to obtain a glass frit. The resulting glass frit was milled according to a two-step procedure consisting on a dry milling stage followed by a long wet milling step down. Each composition was wet homogenized and then dried at 110 ºC for 48 h for disaggregation. The obtained powders were uniaxially pressed (100 MPa) and compacts sintered by fast firing (175 ºC/min) between 800 and 900 ºC for 30 min. The composites, with relative densities ranging from 89% to 93%, showed zircon and β-spodumene as main crystalline phases. The hardness and Young's modulus varied from 4.5 to 6.5 GPa, and from 65 to 102 GPa, respectively. The formation of β-spodumene in the obtained composites leads to reduce the CTEs, whose values ranged from 13 to 7 x 10 -6 ºC -1 .

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Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Cited by 25 publications

References 32 publications

In Situ Monitoring of Microwave Processing of Materials at High Temperatures through Dielectric Properties Measurement

In Situ Monitoring of Microwave Processing of Materials at High Temperatures through Dielectric Properties Measurement

Eggshell derived mesoporous biphasic calcium phosphate for biomedical applications using rapid thermal processing

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

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