Abstract
Microwave energy can be used for the processing of a wide variety of materials. It is used most commonly for the heating of food and has been increasingly applied for processing of polymers; ceramics; metals; minerals and composites. The use of microwave energy allows rapid and volumetric heating where heat is generated from within the material instead of via radiative heat transfer from external heating elements. This paper aims to provide a review on the use of energy efficient and environment friendly microwave energy route to synthesize magnesium based materials reinforced with various types of metallic and ceramic reinforcements. Magnesium composites are extremely attractive for weight critical applications in automotive; aerospace; electronics and transportation sectors. The magnesium composites were prepared using blend—compact—microwave sintering—extrusion methodology. Microwave sintering allowed a significant reduction of 80% in both processing time and energy consumption over conventional sintering without any detrimental effect on the properties of the synthesized magnesium composites. Physical; microstructure and mechanical properties of microwave sintered magnesium composites will also be discussed and compared with magnesium composites processed by conventional liquid and solid processing techniques.
Highlights
Interest in microwave heating applications started towards the end of World War II when major manufacturers of microwave tubes, such as Westinghouse, General
This review aims to provide an update on the research work on magnesium based materials reinforced with different types of ceramic, metallic and amorphous reinforcements synthesized using hybrid microwave sintering
Minimizing the grain growth enhances the mechanical properties of materials
Summary
Microwaves are part of the electromagnetic spectrum with frequencies ranging from 300 MHz to. Microwave technology developed rapidly during Second World War due to the demand for better radar technology for detection of enemy aircraft and submarines. During this period, the applications of microwaves were mainly restricted to radar and communications with limited studies on the use of microwaves for heating of tissues in therapeutic applications [1,2]. Electric and Raytheon, started to look into alternative uses for microwave tubes, and filed many patents to make use of microwave heating for industrial applications, such as drying of tires, textiles, and wood; commercial processing; and treatment of food. There are promising applications in using microwave heating for mineral processing, waste remediation and recycling
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