Journal Article•
Microwave Processing of Ceramic Materials
01 Jan 1989-American Ceramic Society Bulletin (American Ceramic Society)-Vol. 68, Iss: 2, pp 376-386
TL;DR: In this paper, a synthese sur les avantages de l'utilisation d'hyperfrequences for les traitements thermiques des ceramiques is presented.
Abstract: Article de synthese sur les avantages de l'utilisation d'hyperfrequences pour les traitements thermiques des ceramiques
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TL;DR: In this paper, the fundamentals of electromagnetic theory, dielectric response, and applications of microwave heating to materials processing, especially fiber composites, are reviewed in this article, and a knowledge of electromagnetic theories and dielectrics is essential to optimize the processing of materials through microwave heating.
Abstract: In microwave processing, energy is supplied by an electromagnetic field directly to the material. This results in rapid heating throughout the material thickness with reduced thermal gradients. Volumetric heating can also reduce processing times and save energy. The microwave field and the dielectric response of a material govern its ability to heat with microwave energy. A knowledge of electromagnetic theory and dielectric response is essential to optimize the processing of materials through microwave heating. The fundamentals of electromagnetic theory, dielectric response, and applications of microwave heating to materials processing, especially fiber composites, are reviewed in this article.
1,296 citations
TL;DR: In this paper, the principles underlying the dielectric heating effects observed for chemical compounds in solution and in the solid state are presented, and applications of the technique to a wide range of chemical syntheses have also been indicated.
Abstract: This review has presented the principles underlying the dielectric heating effects observed for chemical compounds in solution and in the solid state. The applications of the technique to a wide range of chemical syntheses have also been indicated. The field is in its infancy and therefore much of the effort to date has been directed towards understanding the rate enhancements of known reactions. The next few years should see the isolation of new compounds using microwave heating techniques
1,067 citations
TL;DR: Microwave sintering has emerged as a new method for sinterding a variety of materials that has shown significant advantages against conventional sinterging procedures as mentioned in this paper. But microwave sinterings are not suitable for all materials.
911 citations
TL;DR: In this article, the microwave sintering of standard powdered metals from commercial sources using a 2.45 GHz microwave field, yielding dense products with better mechanical properties than those obtained by conventional heating.
Abstract: The use of microwaves to process absorbing materials was studied intensively in the 1970s and 1980s, and has now been applied to a wide variety of materials1,2,3,4. Initially, success in microwave heating and sintering was confined mainly to oxide and some non-oxide ceramics5,6,7,8,9,10,11; but recently the technique has been extended to carbide semimetals12,13,14 used in cutting tools. Here we describe the microwave sintering of powdered metals to full density. We are able to sinter a wide range of standard powdered metals from commercial sources using a 2.45-GHz microwave field, yielding dense products with better mechanical properties than those obtained by conventional heating. These findings are surprising in view of the reflectivity of bulk metals at microwave frequencies. The ability to sinter metals with microwaves should assist in the preparation of high-performance metal parts needed in many industries, for example, in the automotive industry.
760 citations
TL;DR: A review of microwave-assisted synthesis of inorganic materials can be found in this article, where a variety of materials such as carbides, nitrides, complex oxides, silicides, zeolites, apatite, etc.
Abstract: Use of microwaves in the synthesis of materials is gaining importance. Microwave-assisted synthesis is generally much faster, cleaner, and more economical than the conventional methods. A variety of materials such as carbides, nitrides, complex oxides, silicides, zeolites, apatite, etc. have been synthesized using microwaves. Many of these are of industrial and technological importance. An understanding of the microwave interaction with materials has been based on concepts of dielectric heating and of the resonance absorption due to rotational excitation. This review presents a summary of recent reports of microwave synthesis of inorganic materials. Various observations regarding microwave interaction with materials are also briefly discussed.
743 citations