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Study on Microwave Sintering of Dielectric Ceramics

Author: YangXueZuo
Tutor: LiYuPing
School: Hunan University
Course: Materials Science
Keywords: Dielectric ceramics Microwave heating Microwave K0.5Na0.5NbO3 lead-free piezoelectric ceramics (Zr0.8Sn0.2TiO4 Microwave dielectric ceramics
CLC: TF124.3
Type: Master's thesis
Year: 2010
Downloads: 88
Quote: 0
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Abstract


Microwave sintering technology is using a microwave having a special band and the basic material of the fine structure coupled to generate heat, the dielectric loss of the material its material whole was heated to the sintering temperature to achieve densification method is rapid preparation and quality of new materials and important technical means for preparing a new performance of traditional materials. It has the advantages of low sintering temperature, sintering time, high energy efficiency and heating efficiency, safety and health non-polluting. In this paper, four 1.5kW microwave source superimposed by cavity insulation device optimization to design an industrial microwave. When the input power of 1.5kW microwave energy, the power density of the oven cavity 30kW/m3 input maximum power of 6kW, the power density of the furnace chamber has reached 120kW/m3. Is that the device needs to be improved: the microwave source power only four adjustable, it is difficult to accurately control the heating rate only applies to the heating rate with less stringent requirements material, such as the synthesis of the powder material. Self-designed industrial microwave synthesized K0.5Na0.5NbO3 (KNN) lead-free piezoelectric ceramic powder. Reasonable insulation devices and microwave synthesis process is designed to heat up the curve, the effects of different microwave synthesis temperature impact on of KNN the powders performance and morphology. : Solid-phase synthesis of traditional electric temperature above 800 ℃ at 600 ℃ for 5 min, and the solid-phase synthesis temperature of the microwave method, can be obtained in the the MPB phase boundary (MPB) powder, reduced by at least 200 ℃ the synthesis temperature, and the overall synthesis time is less than the electric synthesis of 1/20. Material synthesis method for microwave synthesis of powder shape rules, uniform in size, reunion fewer, better sintering properties, is a very good application prospects. Were used to the effects of the electric and microwave sintering method (Zr0.8Sn0.2) TiO4 (ZST) microwave dielectric ceramics research different method system of sintering process of the the medium ceramic material density, microstructure, phase composition and microwave dielectric properties . The results showed that: compared with the electric sintering, in the case of the approximation of the density of the resulting material, microwave sintering can reduce the sintering temperature of approximately 70 ° C to reduce the sintering time 2.5h, obtained material density distribution of the standard differential is greatly reduced; microwave sintering the resulting material uniform grain size, compact structure; dielectric constant of the material and the quality factor increases as the microwave sintering temperature increased, the corresponding value increased by 17.5% and 14.3% respectively, compared with the traditional sintering. Microwave sintering densification of the dielectric ceramic mechanism as well as the performance of system theory analysis.

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CLC: > Industrial Technology > Metallurgical Industry > Metallurgical Technology > Powder metallurgy (metal ceramic technology ) > Powder molding, sintering and post-processing > Molding process
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