An On-Line System for High Temperature Dielectric Property Measurement of Microwave-Assisted Sintering Materials

Materials

卷:12

Kama Huang¹  Weiquan Ma¹  Yi Zhang¹  Li Wu¹  Tian Xie²  Fengxia Wang² 

[1] College of Electronic and Information Engineering, Sichuan University, Chengdu 610065, China;

[2] State Key Laboratory of Efficient Utilization for Low Grade Phosphate Rock and Its Associated Resources, Wengfu Group, Guiyang 550014, China;

关键词: microwave-assisted material sintering;    dielectric property;    high temperature;    on-line measurement;   

DOI  :  10.3390/ma12040665

来源: DOAJ

【 摘 要 】

Microwave-assisted sintering materials have been proven to deliver improvements in the mechanical and physicochemical properties of the materials, compared with conventional sintering methods. Accurate values of dielectric properties of materials under high temperatures are essential for microwave-assisted sintering. In view of this, this paper, proposes an on-line system to measure the high temperature dielectric properties of materials under microwave processing at a frequency of 2450 MHz. A custom-designed ridge waveguide is utilized, where samples are heated and measured simultaneously. An artificial neural network (ANN) trained with the corresponding simulation data is integrated into this system to reverse the permittivity of the measured materials. This whole system is tested at room temperature with different materials. Accuracies of measuring dielectric property with an error lower than 9% with respect to theoretical data have been achieved even for high loss media. The functionality of the dielectric measurement system has also been demonstrated by heating and measuring Macor and Duran ceramic glass samples up to 800 °C. All the preliminary experiments prove the feasibility of this system. It provides another method for dielectric property measurement and improves the understanding of the mechanism between microwave and media under high temperatures, which is helpful for optimizing the microwave-assisted sintering of materials.

【 授权许可】

Unknown