铌酸锶钡钙无铅热释电陶瓷织构化及其红外探测应用研究

Infrared detection technology can be applied in infrared control and guide,thermal aim, anti-terror etc, pyroelectric ceramics are key sensitive elements material for infrared detectors. With the improvement of environmental awareness of human, development of lead-free pyroelectric ceramics has become the current trends and research hotspots.Calcium strontium barium niobate (SCBN) ferroelectrics can be developped to new lead-free pyroelectric materials due to its good pyrolectric properties and the Curie temperature can be adjusted easily by Ca/Sr/Ba ratio，In this project, the textured CSBN ceramic with excellent pyroelectric properties and high Curie temperature will be obtain by designing the composition of CSBN and hot pressing, oxygen sintering and two-step sintering. The influence of composition, powder and sintering program on the texturl of CSBN ferroelectric ceramics will be studied.The mechanism of texture will be understood. The impact of composition, grain size, texturing on dielectric, pyroelectric properties will also be studied. The relationship between properties and microstructure of CSBN ceramics will be explored. The infrared detector will be prepared by using CSBN pyroelectric ceramics.The effect of materials properties on signal and noise of CSBN infrared detector will be investigated in this project to obtain CSBN ceramics with high performance for infrared detector applications. This project lay the foundation for the development of lead-free pyroelectric ceramic material and its infrared detection technology.

红外探测技术在红外制导、热瞄准、反恐、工业监控等军事和民用领域均具有重要和广泛应用。热释电陶瓷是红外探测器的重要敏感材料，随着人们环境保护意识的提高，无铅化是热释电陶瓷的发展趋势。铌酸锶钡钙（CSBN）材料具有热释电性能高、居里温度随组分可调的优点，有望成为新型无铅热释电陶瓷材料。本项目拟通过优化组分设计，采用热压、通氧及两步法烧结，获得高居里温度、织构化、高热释电性能的CSBN陶瓷。研究组成、粉体、烧结制度等对 CSBN 热释电陶瓷织构化的影响，揭示CSBN陶瓷织构化的机制；研究组分、织构化、晶粒尺寸等对 CSBN 陶瓷的介电和热释电性能的影响，阐明CSBN陶瓷热释电性能与组分及微观结构的内在联系；采用CSBN热释电陶瓷制备单元红外探测器，研究CSBN陶瓷性能对器件信号和噪声的影响规律，获得红外探测器用高性能CSBN热释电陶瓷，为发展新型无铅热释电材料及其红外探测技术奠定基础。

热释电陶瓷是红外探测器的重要敏感材料，随着人们环境保护意识的提高， 无铅化是热释电陶瓷的发展趋势。铌酸锶钡钙（CSBN）材料具有热释电性能高、居里温度随 组分可调的优点，有望成为新型无铅热释电陶瓷材料。本项目通过优化组分设计，采用热 压、通氧及两步法烧结，获得了高居里温度、织构化、高热释电性能的 CSBN 陶瓷。研究了组成、 粉体、烧结制度等对 CSBN 热释电陶瓷织构化的影响，揭示了 CSBN 陶瓷织构化的机制；研究了组分、织构化、晶粒尺寸等对 CSBN 陶瓷的介电和热释电性能的影响，阐明了 CSBN 陶瓷热释 电性能与组分及微观结构的内在联系；为发展新型无铅热释电材料及其红外探测技术奠定基础。项目全面完成了CSBN热释电陶瓷组成设计、微结构调控、性能研究等方面的研究任务，还积极探索了新型无铅热释电陶瓷材料，共发表标注基金支持的SCI论文14篇，申请发明专利7项，培养研究生6名。