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Synthesis of PLZT Powder and Research on Microwave Sintering Technique of PLZT

Author: WangNian
Tutor: ZhouJian
School: Wuhan University of Technology
Course: Materials Science
Keywords: Microwave sintering PLZT Density PbO
CLC: TQ174
Type: Master's thesis
Year: 2002
Downloads: 354
Quote: 5
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Abstract


This paper systematically discusses the basic principles, characteristics and research status of microwave sintering, microwave sintering apparatus typical microwave sintering equipment and experiments, and focuses on the core part of the microwave sintering equipment - sintering cavity. Details of the the PLZT ceramic structure, performance and preparation methods, and highlights important applications in the field of optoelectronic and has been shown light transmission properties of the best composition for 9/65/35 PLZT ferroelectric ceramics. Decided that the the PLZT ferroelectric ceramic light transmission properties and thus expand the scope of its application key factor PLZT high purity of the raw materials and sintered PLZT samples high density. Therefore, this study focuses on from these two aspects. The present study used a part of the co-precipitation method, the chemical methods to synthesize the the PLZT raw material, the results show that using this method to give a PLZT feedstock either purity or size, etc. have reached the Preparation PLZT ferroelectric ceramic requirements. Rapid microwave sintering can reduce the activation energy and promote the grain boundary diffusion, thus contributing to the high density PLZT ceramic; indigenously developed microwave sintering system to carry out a study on how to improve the density of PLZT ferroelectric ceramics. Improve the density of microwave sintering 9/65/35 PLZT ferroelectric ceramics process control and adjust the process parameters of microwave sintering heating rate, sintering temperature, sintering atmosphere and holding time, in the course of the experiment, explore parameters. The study also focused on the mechanism of PbO PLZT ceramic density. The study found that having a very important role in the densification process of the PLZT ferroelectric ceramics, PbO. PLZT system, the presence of low melting point of PbO, hand easily formed in the sintering process the liquid phase, to accelerate grain rearrangement and carried out of the mass transfer process, in order to promote the densification process of the PLZT ceramics, the other hand, also because of volatiles leave the pores, thereby reducing the density of the PLZT ceramics, and may even caused the PLZT composition of deviation. Of microwave sintering of PLZT ferroelectric ceramics, respectively, using X-ray diffraction (XRD) and scanning electron microscopy (SEM) of PLZT ceramic characterized. The results show that the improvement of the microwave sintering process can effectively control the volatilization of PbO during sintering to promote sample pores sufficiently discharged, which is conducive to the fine grain uniform and having a higher density of the PLZT ferroelectric ceramics.

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