Microwave processing of porcelain tableware using a multiple generator configuration

Santos, T.; Costa, L.C.; Hennetier, L.; Monteiro, J.; Sousa, J.

doi:10.1016/j.applthermaleng.2012.07.010

Cited by 24 publications

(22 citation statements)

References 8 publications

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“…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%

“…In what concerns clay-based ceramic materials, namely faience or fine earthenware, stoneware, and porcelain, few papers are focusing on the microwave firing process. [23][24][25][26][27][28] They are mainly focused on pellet-like materials, whose dimensions do not require electromagnetic field homogeneity, or on the final product, and not on the firing process. Usually, single-mode cavities with circulators or other systems are used to vary and tune the microwave applied power.…”

Section: Introductionmentioning

confidence: 99%

“…Large and multiobjects requires the use of multimode microwave furnaces and methods to create an electromagnetic field uniformity, and consequently, to reach temperature uniformity in the samples being processed. 3,23,[29][30][31] The work developed in Ref. [32] is possibly the first one that applied microwave radiation for traditional ceramic firing.…”

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: Procedures and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…MW heating provides a very efficient way of producing non-contact, localized or extended heat sources by a convenient choice of the MW applicator (antenna), excitation sequence and MW selective absorption in the heated material. [11][12][13][14][15][16] Despite the huge improvements concerning magnetron power supply and magnetron efficiency, homogeneous heating of the sample still remains a problem. Currently, the engineering solutions in place for the homogenization of the MW a) Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Microwave heating device for internal heating convection experiments, applied to Earth's mantle dynamics

Surducan

Limare

Neamţu

et al. 2014

Review of Scientific Instruments

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We report the design, construction, and performances of a microwave (MW) heating device for laboratory experiments with non-contact, homogeneous internal heating. The device generates MW radiation at 2.47 GHz from a commercial magnetron supplied by a pulsed current inverter using proprietary, feedback based command and control hardware and software. Specially designed MW launchers direct the MW radiation into the sample through a MW homogenizer, devised to even the MW power distribution into the sample's volume. An adjustable MW circuit adapts the MW generator to the load (i.e., the sample) placed in the experiment chamber. Dedicated heatsinks maintain the MW circuits at constant temperature throughout the experiment. Openings for laser scanning for image acquisition with a CCD camera and for the cooling circuits are protected by special MW filters. The performances of the device are analyzed in terms of heating uniformity, long term output power stability, and load matching. The device is used for small scale experiments simulating Earth's mantle convection. The 30 × 30 × 5 cm(3) convection tank is filled with a water‑based viscous fluid. A uniform and constant temperature is maintained at the upper boundary by an aluminum heat exchanger and adiabatic conditions apply at the tank base. We characterize the geometry of the convective regime as well as its bulk thermal evolution by measuring the velocity field by Particle Image Velocimetry and the temperature field by using Thermochromic Liquid Crystals.

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“…Microwave (MW) heating has received great attention due to its merits of being convenient, economical, fast, and environmental friendly. 17,18 It was widely used in the fields of ceramics sintering, chemical synthesis and analysis, metallic materials synthesis, food drying, and so on. [19][20][21] MW is an electromagnetic waves with operating frequencies range between 300 MHz and 300 GHz.…”

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confidence: 99%

Microwave‐assisted rapid fabrication of robust polyetherimide bead foam parts

Feng

2020

J of Applied Polymer Sci

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Polyetherimide (PEI) is an important candidate for fabrication of highperformance polymer foams. Nevertheless, the manufacture of PEI foamed parts with specific three-dimensional geometry shape and lightweight properties remains a big challenge worldwide. Herein, a microwave (MW)-assisted foaming and selective sintering approach was proposed towards rapid fabrication of robust PEI bead foams. During the process, compressed carbon dioxide/tetrahydrofuran was used as physical co-foaming agent, and the surface-coated graphene nanoplatelets (GNPs) was used as MW absorbent. Upon MW irradiation, the GNPs selectively heated and served as solders that effectively facilitated the foaming of expandable PEI (EPEI) beads, and strongly promoted the local polymer melt and entanglement across the surface of EPEI beads. The MW irradiation power and time were considered as the important parameters to achieve fine inter-bead bonding strength between foamed beads. As a model system, we successfully fabricated a 25-mmthickness foamed part with an apparent density of 0.32 g/cm 3 and achieved excellent inter-bead bonding performance. Specifically, we also utilized the COMSOL Multiphysics simulations to study the MW selective heating mechanism. This MW-assisted fabrication strategy offers a new foaming approach toward high-performance polymer foamed parts for many advanced applications.

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Microwave processing of porcelain tableware using a multiple generator configuration

Cited by 24 publications

References 8 publications

Microwave vs conventional porcelain firing: Macroscopic properties

Microwave vs conventional porcelain firing: Macroscopic properties

Microwave heating device for internal heating convection experiments, applied to Earth's mantle dynamics

Microwave‐assisted rapid fabrication of robust polyetherimide bead foam parts

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