Microwave versus conventional porcelain firing: Temperature measurement

Santos, T.; Hennetier, L.; Costa, V.A.F.; Costa, L. C.

doi:10.1016/j.jmapro.2019.03.038

Cited by 21 publications

(32 citation statements)

References 23 publications

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“…The water absorption of samples in position 8 increased considerably with the temperature, and reached 7.5% at 1410°C, those revealing higher closed porosity than those samples in positions 1, 2, 3, 4, 5, and 10, as observed in Figure 2. 35 Below 1300°C-1350°C, the shape of the water absorption curve of the sample in position 2 falls over the average water absorption curve. Above the eutectic temperature (∼985°C) of the K 2 O-Al 2 O 3 -SiO 2 system, a separation of the water absorption curves is observed.…”

Section: Resultsmentioning

confidence: 97%

“…The existence of the microwave non-thermal phenomenon, claimed in some works, 47 was not detected in this case. 35 The temperature measured by the pyrometer, when the samples were fired in the microwave furnace, was surely lower than the real temperature in the samples' core. On the other hand, the temperature measured by the thermocouple, when the samples were fired in the electric furnace, was certainly higher than the samples' temperature, their surface being hotter than their core being.…”

Section: Discussionmentioning

confidence: 95%

“…More information related to this subject and the details of experimental procedure can be found elsewhere. 23,24,35 Data presented in Figure 1 refer to greenware samples fired up to 420°C, 650°C, and 1020°C, and to biscuit samples fired up to 1400°C. Temperatures, measured by the pyrometer (TP) and by the thermocouple (TT) inside the microwave furnace, are presented for each set point temperature.…”

Section: Procedures and Methodsmentioning

confidence: 99%

“…A voltage-temperature function was set for each sample (greenware and biscuit), and introduced into the code developed for the microwave furnace control through the temperature measured by the pyrometer. 35 Water absorption was measured following the European Standard EN1217:1997. 37 Apparent and bulk densities and apparent porosity were measured by immersion in boiling water for 3 h, following the ISO 18754 Standard (2003).…”

Section: F I G U R Ementioning

confidence: 99%

“…Previous research work on tableware microwave firing 23,24,34,35 proved that the required firing temperatures are about 50°C‐100°C lower than that required by the conventional process.…”

Section: Introductionmentioning

confidence: 99%

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Microwave vs conventional porcelain firing: Macroscopic properties

Santos

Hennetier

Costa

et al. 2020

Int J Applied Ceramic Tech

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This paper provides an overview of the macroscopic properties of porcelain tableware fired in a microwave furnace with six magnetrons (each with a nominal power of 900 W) operating at the frequency of 2.45 GHz. The dependence of firing temperature on physical properties such as shrinkage, water absorption, apparent porosity, bulk density, and impact resistance was analyzed. Emphasis is on the differences in the macroscopic properties of microwave and conventionally (gas and electric) fired porcelain. Batches were fired from room temperature up to above the optimum firing temperature (1380°C). Results show similar macroscopic properties for both firing methods, microwave heating required lower firing temperatures (between 1300°C and 1350°C), and shorter processing times (about 70 minutes). The main differences between microwave and electric firing methods occur in a temperature band of 300°C above the porcelain eutectic temperature (close to 1000°C).

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Section: Resultsmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 95%

Section: Procedures and Methodsmentioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microwave vs conventional porcelain firing: Macroscopic properties

Santos

Hennetier

Costa

et al. 2020

Int J Applied Ceramic Tech

Self Cite

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Magnetic Supraparticles Capable of Recording High‐Temperature Events

Wolf,

Sauer,

Hurle

et al. 2024

Adv Funct Materials

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Superparamagnetic iron oxide nanoparticles (SPIONs) are prone to oxidation at elevated temperatures (>300 °C) and lose their magnetizability upon transition from magnetite/maghemite (γ‐Fe2O3 / Fe3O4) to hematite (α‐Fe2O3). Silica (SiO2) shells can effectively prevent this undesired effect up to ≈1000 °C. Herein, the study shows how to utilize SPIONs with varying SiO2 shell thickness and thus, different oxidation susceptibility, and how to combine them in micrometers sized assemblies – so‐called supraparticles (SPs), to create a structurally emerging magnetic temperature recording functionality. The desired oxidation of non or weakly‐protected SPIONs within SPs upon temperature events reduces dipole–dipole interactions of well‐protected SPIONs in the confined SP entity. The resulting change of magnetic interactions therefore contains information on the thermal history of the SP, which can be spectrally read out via magnetic particle spectroscopy within seconds. Their working range can be tuned from 400 to 1000 °C on two independent structural hierarchy levels, namely the SiO2 shell thickness and the freely selectable ratios of different building blocks in the SP. The application of such SPs as particulate additives for magnetic recording of high‐temperature events, especially relevant in metal, alloy, and ceramic processing, representing a yet unexplored and optically‐independent option for bulk temperature recording is proposed.

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Investigation of methods to prevent pin‐holing defect in tableware ceramic industry

Hasanuzzaman

Islam

Rashid

2022

Int J Ceramic Engine & Sci

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Pin‐holing is one of the major glazing defects that the tableware ceramic industry is experiencing. It is evident from this research work that the pin‐holing defect can be prevented or at least reduced by optimizing composition and sintering profile, which in turn yields pin‐hole‐free tableware ceramics. Differential scanning calorimeter/thermo gravimetric analysis and dilatometer are found to be effective to understand the thermal behavior of specific ceramic tableware bodies and glaze. Dilatometry was employed to investigate the densification behavior and it was found that densification of the ceramic body reached completion by 1300°C. The final optimum firing temperature and soaking time, which are believed to influence the microstructure and mechanical properties of the ceramicware, were found to be 1300°C and 90 min, respectively. The microstructural change of the ceramic body and glaze sintered at different temperatures and times is observed under field emission scanning electron microscopy. It was found that the existence of pin‐holing defect largely depends on the feldspar and quartz content in glaze raw material as well as the applied firing profile, and the result was found satisfactory when the ratio (quartz/feldspar) was ∼2.

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Microwave versus conventional porcelain firing: Temperature measurement

Cited by 21 publications

References 23 publications

Microwave vs conventional porcelain firing: Macroscopic properties

Microwave vs conventional porcelain firing: Macroscopic properties

Magnetic Supraparticles Capable of Recording High‐Temperature Events

Investigation of methods to prevent pin‐holing defect in tableware ceramic industry

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